The short answer
The best running weather app depends on the job. To plan a named marathon, MeteoPace and Racecast go furthest. To pick the hour, RunWeather and WeatherToRun score every hour. To dress for the weather, Dress My Run is free. To see heat stress along your own route at your pace, RunFast's Map your run is a free browser tool.
Key takeaways
- We compared 15 apps from their listings and websites as of October 2026. We did not test them.
- Race planners cover named races. Very few take your own route file and pace.
- Hourly "when to run" scores are common. Dew point and WBGT heat stress are rarer.
- A free download often puts the most useful feature behind a subscription or Pro tier.
- Check whether an app's feels like assumes still air or your running pace.
Feature check
What each one actually shows a runner, side by side.
| Tool | Best for | Price (as of October 2026) | Own route | Min:sec pace | Dew point | Heat stress |
|---|---|---|---|---|---|---|
| MeteoPace | Planning a supported race in detail, split by split | Free download; Race Pass $8.99, Pro $9.99 a month, Core from $5.99 a month (US App Store); 14-day Pro trial | – | ✓ | ? | ? |
| Racecast | Race-day forecasts and history for named races | Forecasts free; Race Plan $9 once | – | ✓ | ? | ? |
| Wyndo | A go-or-wait call and start-line race history | Free account; paid tier not shown | – | ◐ | ✓ | ◐ |
| TrueEffort | Hill-adjusted splits on your own route file | Free; Pro price not shown | ✓ | ✓ | ? | ? |
| Epic Ride Weather | Weather along any route at your speed and start time | 30-day free trial (1,000 forecasts), then $2.99 a month or $19.99 a year (€22.99 or £19.99 a year) | ✓ | – | – | – |
| Garmin race widget | Garmin owners with a race on their calendar | Free with a compatible watch | ◐ | ? | ? | ? |
| RunWeather | A run score and the best window to run | Free; Pro price not shown | – | ◐ | ◐ | ? |
| WeatherToRun | Hourly running scores 10 days ahead | Free; in-app price not shown | – | ? | ? | ? |
| Run Window | The best hour to run, from your comfort profile | 7-day trial, then from $5.99 a month | – | ? | ? | ? |
| Good To Run | WBGT and flag conditions in an everyday forecast | Free; subscription price not shown | – | ? | ? | ✓ |
| Dress My Run | What to wear, in the browser | Free | – | – | ? | – |
| RunnersKit | Feels like at your pace, and what to wear | Free; Pro price not shown | – | ? | ? | ? |
| Apple Weather | An everyday hourly forecast with dew point | Free | – | – | ✓ | ? |
| CARROT Weather | Custom forecast layouts that include dew point | Free download; premium price not shown | – | – | ✓ | ? |
| Runna (Adapt for Heat) | Plan sessions and races with pace targets adjusted for heat | $19.99 a month or $119.99 a year (£15.99/£99.99, A$29.99/A$179.99, R149.99/R899.99); 7-day free trial | – | ✓ | – | ? |
| RunFast Map your run Ours | Any route at your own pace, the heat timed to every kilometre | Free, no account | ✓ | ✓ | ✓ | ✓ |
✓ yes ◐ partly – no. Facts from each maker's own pages, as of October 2026.
On this page
- What is the best running weather app in 2026?
- How did we compare these apps?
- How do the 15 apps compare at a glance?
- Which apps plan a race or a route at your pace?
- Which apps tell you the best time to run?
- Which apps tell you what to wear?
- Which general weather apps work well for runners?
- Does any app adjust your training pace for heat?
- Where does RunFast's Map your run fit?
- Are there good free running weather tools with no login?
- Which running weather app should you pick?
- What should a running weather app show you?
- Questions runners ask
- Sources and method
Words this guide uses
- Pace-timed forecast
- The weather for each stretch of your route at the time you'll run it, worked out from your start time and pace.
- Dew point
- The temperature at which the air would be saturated; the higher it is, the less your sweat can evaporate.
- WBGT
- Wet-bulb globe temperature, a heat-stress index combining air temperature, humidity, sun and wind, which race medical teams use to set heat flags.
What is the best running weather app in 2026?
The best running weather app is the one built for your job: planning a race, choosing the hour to run, or deciding what to wear. No single app does all three well, so we compared 15 of them, as of October 2026.
If you want the heat along your own route at your own pace right now, without installing anything, try Map your run. It's our free browser tool, so read its entry below with that in mind. It gives you a pace-timed forecast: the weather for each stretch of your route at the time you'll run it.
Quick picks, by job:
- Planning a named marathon: MeteoPace or Racecast.
- Choosing the hour to run: RunWeather, WeatherToRun or Run Window.
- What to wear: Dress My Run, free in the browser.
- A training plan that adjusts for heat: Runna.
- You already race with a Garmin: Garmin's race widget.
- An everyday forecast with dew point: Apple Weather or CARROT Weather.
How did we compare these apps?
We read every app's website, App Store listing and help pages, plus named reviews, in October 2026. We did not install and test them, so nothing here judges accuracy or bugs.
"Free" means free to download. We give an in-app price only where the app's own page showed one. Where it didn't, we say so instead of repeating figures from price trackers, which go stale.
We looked at six things: whether it follows a route at your pace, whether it shows dew point, whether it gives WBGT heat stress, how far ahead it reaches (and any race history), the platforms, and the price of the part you actually need.
How do the 15 apps compare at a glance?
Most score your local forecast. Only a handful know about races or routes.
| App | Best for | Platforms | Price, as of October 2026 (USD) | Route or race aware |
|---|---|---|---|---|
| MeteoPace | Planning a supported race | iOS, Android, web | Free download; Race Pass $8.99, Pro $9.99 a month | Supported races |
| Racecast | Race-day forecast and history | Web | Forecasts free; Race Plan $9 once | Named races |
| Wyndo | Go or wait alerts; race history | Web, email | Free account; paid tier not shown | Named races, start line |
| TrueEffort | Hill-adjusted splits from a route file | iOS | Free; Pro price not confirmed | Your route file (Pro for weather) |
| Epic Ride Weather | Weather along a route at your speed | iOS, Android, Karoo | 30-day free trial, then $2.99 a month or $19.99 a year | Any route |
| Garmin race widget | Garmin owners with a race booked | Garmin watches | Free with a compatible watch | Races on your calendar |
| RunWeather | A run score and best window | iOS, Android | Free; Pro price not confirmed | No |
| WeatherToRun | Hourly scores 10 days ahead | iOS, Apple Watch | Free; in-app price not confirmed | No |
| Run Window | Best hour from your comfort profile | iOS | 7-day trial, then from $5.99 a month | No |
| Good To Run | WBGT and flag conditions | iOS | Free; subscription price not confirmed | No |
| Dress My Run | What to wear | Web | Free | No |
| RunnersKit | Feels like at your pace; outfit | iOS, Apple Watch | Free; Pro price not confirmed | No |
| Runna (Adapt for Heat) | Heat-adjusted sessions and races in its plans | iOS, Android | 7-day trial, then $19.99 a month or $119.99 a year | No |
| Apple Weather | Everyday hourly forecast | iPhone | Free | No |
| CARROT Weather | Custom layouts with dew point | iOS | Free download; premium price not confirmed | No |
| Map your run (ours) | Heat stress along your route at your pace | Web | Free, no sign-up | Your route file, or 4 races |
Which apps plan a race or a route at your pace?
Six go beyond your local forecast: three cover named races, two take a route, and one lives on your watch.
MeteoPace
Best forPlanning a supported race in detail, split by split
Strengths
- Forecast, historical norms and course profile in one race plan
- A Meteo Adjusted Pace and a split-by-split plan
- Sends plans to Garmin and COROS watches; syncs with Strava
- Tracks heat adaptation
Limits
- Supported races only, not any route
- The full plan is paid
Checked October 2026
Best for planning a supported race in detail. It combines the forecast, historical norms and the course profile into a "Meteo Adjusted Pace" and a split-by-split plan, and sends plans to Garmin and COROS watches. Limits: it works for "any supported race", not any route, and the full plan is paid: per its App Store listing, as of October 2026, a Race Pass costs $8.99, Pro $9.99 a month and Core from $5.99 a month. See the MeteoPace alternatives.
Racecast
Best forRace-day forecasts and history for named races
Strengths
- A big catalogue of named races
- RunScore (0–10), calibrated on about 6.3 million finish times
- Free race forecasts and a weather-adjusted pace calculator
Limits
- No upload of your own route
- Comrades page shows one year of data
- Account creation is invite-only
Checked October 2026
Best for race-day forecasts and history across a big catalogue of named races. Its RunScore (0–10) estimates how much the weather slows a typical marathoner, calibrated, per its About page, on about 6.3 million finish times from 1,686 editions of 92 marathons. Its forecasts and race-day history come from Visual Crossing, its About page says. Limits: its Comrades page shows one year of data, and runners can't upload their own route. See the Racecast alternatives.
Wyndo
Best forA go-or-wait call and start-line race history
Strengths
- Race pages with start-hour temperature, dew point, wind and rain
- ERA5 history back to 2007 for Boston
- A free heat-adjusted pace calculator citing four studies
Limits
- History for the start line only
- Fahrenheit-first
- Race index lists neither London nor Comrades
- Calculator ignores wind and acclimatisation; stops near 28 °C (82 °F) WBGT
Checked October 2026
Best for a quick go-or-wait call and race history. Its race pages give start-hour temperature, dew point, wind and rain from ERA5 reanalysis, back to 2007 for Boston. Its free heat-adjusted pace calculator cites four studies. Limits: history is for the start line only, it's Fahrenheit-first, and its race index listed neither London nor Comrades. The calculator ignores wind and acclimatisation and stops at a WBGT of about 28 °C (82 °F). See the Wyndo alternatives.
TrueEffort
Best forHill-adjusted splits on your own route file
Strengths
- Imports GPX, FIT, TCX or KML files
- A grade-adjusted split for every kilometre or mile
- Pro adds race-day weather for your route and start time, per-split wind and PDF export
Limits
- Weather is behind Pro
- No dew point or WBGT mentioned
- iPhone only; launched 31 May 2026
Checked October 2026
Best for hill-adjusted splits on your own route. It imports GPX, FIT, TCX or KML files and gives a grade-adjusted split for every kilometre or mile. Limits: race-day weather for your route and start time is behind Pro, and no dew point or WBGT is mentioned. It launched on 31 May 2026 on iPhone only.
Epic Ride Weather
Best forWeather along any route at your speed and start time
Strengths
- A forecast every 10 minutes along your route
- Temperature, feels like, wind, rain and air quality
- Mature, with 786 US ratings
Limits
- Built for cyclists
- Speed rather than a min:sec pace
- No dew point or heat-stress model
Checked October 2026
Best for weather along any route at your own speed and start time, every 10 minutes: temperature, feels like, wind, rain and air quality. It's mature, with 786 US ratings. Limits: it's built for cyclists, so you set speed rather than a min:sec pace, and there's no dew point or heat-stress model. Read how Epic Ride Weather works for running.
Garmin race widget
Best forGarmin owners with a race on their calendar
Strengths
- Built in: a countdown, a predicted time and the weather
- Historical weather at once; the forecast about 14 days out
- With a course attached, the prediction accounts for terrain and wind
Limits
- Garmin hardware only
- No kilometre-by-kilometre heat timeline
Checked October 2026
Best for runners who already race with a Garmin. Put a race on your Garmin calendar and the widget shows a countdown, a predicted time and the weather. Garmin's manuals say historical weather shows at once and the forecast about 14 days out. Limits: Garmin hardware only, and no kilometre-by-kilometre heat timeline. Our guide to Garmin race-day weather shows what it covers.
Which apps tell you the best time to run?
Four apps score the hours ahead so you can pick a window. They read your local forecast, not a route. Our guide to the best time to run in hot weather explains why dawn isn't always the easiest hour.
RunWeather
Best forA run score and the best window to run
Strengths
- 0–100 Run Score from temperature, dew point, wind, rain and UV
- A best window and a 'weather tax' pace target
- Strava import and web calculators
Limits
- Your local forecast, not a route
- Launched June 2026; 33 US ratings
- Pro price not shown
Checked October 2026
A 0–100 Run Score from temperature, dew point, wind, rain and UV, a best window, and a "weather tax" pace target. It imports from Strava and says it's "science, not AI". iOS and Android, launched June 2026.
WeatherToRun
Best forHourly running scores 10 days ahead
Strengths
- 0–100 hourly running scores over 10 days
- An acclimation setting
- Kit advice
Limits
- Your local forecast, not a route
- 11 US ratings
- In-app price not shown
Checked October 2026
Hourly 0–100 running scores over 10 days, with an acclimation setting and kit advice. iPhone and Apple Watch.
Run Window
Best forThe best hour to run, from your comfort profile
Strengths
- Learns your comfort profile
- Picks the best hour for you
Limits
- iPhone only
- A subscription after the trial
- Your local forecast, not a route
Checked October 2026
It learns your comfort profile and picks the best hour for you. iPhone only, from $5.99 a month after a 7-day trial, per its App Store listing. Its own "best running weather apps 2026" list (17 January 2026) ranks Run Window first.
Good To Run
Best forWBGT and flag conditions in an everyday forecast
Strengths
- A forecast built around WBGT heat stress
- Flag conditions and UV
- 7- or 15-day hourly detail by subscription
Limits
- iPhone only
- Last updated January 2025
- Your local forecast, not a route
Checked October 2026
The only app here built around WBGT: a forecast with heat stress, flag conditions and UV, with a subscription for 7- or 15-day hourly detail. iPhone, since 2016, last updated January 2025.
Which apps tell you what to wear?
Two stand out: Dress My Run for simplicity and RunnersKit for feels like at your pace. For the reasoning behind any outfit, read what to wear running at every temperature, and for race day, what to wear for a marathon.
Dress My Run
Best forWhat to wear, in the browser
Strengths
- Outfit advice from live weather
- A 24-hour forecast
- A hot or cold runner setting, with no account
Limits
- No route, pace or heat-stress model
- No iPhone app found under that name
Checked October 2026
The best-known outfit tool, free in the browser. It reads live weather (Apple Weather, per Canadian Running in January 2026), shows a 24-hour forecast and lets you say whether you run hot or cold, with no account. Limits: no route, pace or heat-stress model.
RunnersKit
Best forFeels like at your pace, and what to wear
Strengths
- RunFeel adjusts feels like to your body, pace and distance
- An outfit avatar
- A RunReady hourly score
Limits
- Your local forecast, not a route
- Launched July 2026
- Pro price not shown
Checked October 2026
Its "RunFeel" adjusts feels like to your body, pace and distance: the right idea, because running makes its own breeze. It adds an outfit avatar and a RunReady hourly score. iPhone and Apple Watch, launched July 2026.
Which general weather apps work well for runners?
Apple Weather and CARROT Weather are the two runners mention most, mainly because both show dew point. Neither knows your route or pace.
Apple Weather
Best forAn everyday hourly forecast with dew point
Strengths
- Hourly temperature, feels like, dew point, humidity, wind and UV
- Minute-by-minute rain in some regions
- Already on every iPhone
Limits
- One place, not your route
- Feels like ignores the breeze you make by running
Checked October 2026
Free on iPhone, with hourly temperature, feels like, dew point, humidity, wind, UV and minute-by-minute rain in some regions. It's a good everyday check. Its feels like doesn't include the breeze you make by running, so on a cold morning you'll feel colder than it says.
CARROT Weather
Best forCustom forecast layouts that include dew point
Strengths
- Highly customisable layouts
- Shows dew point
- 87,546 US ratings
Limits
- No route or pace features
- Premium price not shown
Checked October 2026
Customisable layouts that include dew point, which is why runners cite it. A free download, with the premium price not shown. Our guide to dew point for runners shows which numbers to watch.
Does any app adjust your training pace for heat?
Yes. Runna's "Adapt for Heat", added on 29 July 2026, adjusts your session pace targets using feels like, the workout's length and your plan, with a colour-coded hourly forecast. It runs on iPhone and Android, by subscription: $19.99 a month or $119.99 a year (£15.99 or £99.99) as of October 2026, after a 7-day free trial. Our guide to Runna's Adapt for Heat goes deeper.
Best forPlan sessions and races with pace targets adjusted for heat
Strengths
- Adapt for Heat (since 29 July 2026) adjusts session pace targets
- Uses feels like, workout length and your plan
- A colour-coded hourly forecast
Limits
- One hour and one place, not a route
- Uses humidity rather than dew point and ignores acclimatisation, per one independent test
- Paid after a 7-day trial
Checked October 2026
One independent test, by the Running Westward Ho blog in August 2026, found it more conservative than the Hadley or Mantzios methods. It also noted that Runna uses humidity rather than dew point and ignores acclimatisation. Runna's help page lists races among the sessions it slows, but it reads one hour and one place, not the heat along a route.
If you only need a number, free calculators do the job. Our comparison of heat-adjusted pace calculators covers Hadley, John Davis's Running Writings model and others. The research behind them is solid: Ely and colleagues (2007) found marathon times slow progressively as WBGT rises from 5 to 25 °C (41 to 77 °F), and slower runners lose more.
Where does RunFast's Map your run fit?
Map your run is RunFast's free browser tool, and a free RunFast account on the web saves your runs and puts you on your club's page; the phone apps, with live tracking, are coming. We built it, so here are its limits as plainly as its strengths.
Best forAny route at your own pace, the heat timed to every kilometre
Strengths
- Your own GPX, FIT or TCX route, or four big races
- Feels like, dew point and WBGT heat stress for every kilometre at your pace
- A map, a km-by-km table, a share image and a 3D flyover
Limits
- Forecasts reach 10 days ahead
- Race-day history for four races so far
- No alerts, best-time scores or outfit advice
- No phone app yet: the apps are coming
Checked October 2026
What it does: drop in a GPX, FIT or TCX route, or open Comrades, Berlin, London or Boston. Pick the day (up to 10 days ahead, from Apple Weather), a start time and a pace, such as 5:30 per km (8:51 per mile). You get the route coloured by how hard the weather makes each stretch and a kilometre-by-kilometre table: hill-adjusted split, feels like at running pace, dew point, WBGT level, rain and wind. The four races also show every race day from 2015 to 2024, from ERA5 reanalysis. There's a share link and a 3D flyover.
What it doesn't do: no alerts, no hourly "best time" score, no outfit advice, no watch, and no training plans. Race history covers four races, not hundreds. We haven't published an accuracy test, so we make no accuracy claim.
The RunFast apps for iPhone and Android add live tracking so people can follow your race. They're coming; a free account on the web works in them.
Are there good free running weather tools with no login?
Yes: Dress My Run, Map your run, Apple Weather and a few route tools cost nothing and need no account. Our guide to free running weather tools compares them, including the free calculators and route forecasters.
The trade-off is reminders: free browser tools wait for you to open them, while paid apps push alerts.
Which running weather app should you pick?
Start from the question you ask most often, and check the limit before you pay.
| If you want to know… | Look at | Watch out for |
|---|---|---|
| How the weather will slow your marathon | MeteoPace, Racecast | Named races only; full plans are paid |
| What race day was like in past years | Racecast, Wyndo, Map your run | Racecast and Wyndo read a few points per course |
| The heat along your own route at your pace | Map your run; TrueEffort Pro | Browser only; weather behind Pro |
| Which hour to run tomorrow | RunWeather, WeatherToRun, Run Window | Scores use your local forecast, not a route |
| What to wear | Dress My Run, RunnersKit | Still-air numbers in cold wind |
| Heat-adjusted session and race paces | Runna | Subscription; humidity, not dew point |
| A Garmin countdown with the weather | Garmin race widget | Garmin watches only |
What should a running weather app show you?
Five things matter more than a sunny icon. If an app hides one, check it elsewhere.
- Dew point, not just humidity. Dew point tells you how much water is in the air. RunFast grades 18 °C (64 °F) and above as hard going at any pace.
- Feels like at your pace. Running at 10 km/h (6.2 mph), or 6:00 per km (9:39 per mile), in still air at 0 °C (32 °F) feels like about −4 °C (24 °F) on your face, by the wind-chill formula.
- Heat stress. WBGT combines air, humidity, sun and wind; it's the number behind marathon heat flags. Our WBGT guide explains the levels.
- The timing. The 2021 Berlin Marathon started at 16.5 °C (62 °F), and a 4-hour runner met 23.4 °C (74 °F) later on, by ERA5 reanalysis. You need the hour you'll reach each stretch, not the morning low.
- The update time. A forecast is only as good as its age.
The physics is in our hub on running in heat and humidity. Official race flags and your doctor's advice always override any app; this guide is not medical advice.
Questions runners ask
Is there a weather app made only for runners?
Yes, several. As of October 2026, RunWeather, WeatherToRun, Run Window, RunnersKit, Good To Run and Runners Weather are all built for runners on iPhone, and some on Android too. Most score each hour or suggest kit from your local forecast. Fewer handle a race or a route: MeteoPace, Racecast and Wyndo cover named races, and TrueEffort reads your own route file behind its Pro tier.
Which running weather apps show the dew point?
Apple Weather and CARROT Weather show dew point in their hourly detail. Among the running apps, RunWeather builds dew point into its 0–100 Run Score, Wyndo shows it on its race pages, and FindMyMarathon gives it at the start, halfway and finish of named races, as of October 2026. Dew point matters because it measures how much water is in the air, which sets how well your sweat can evaporate.
Which running weather app works with a Garmin watch?
Garmin's own race widget is built in. Add a race to your Garmin calendar and the watch shows a countdown, a predicted time and the weather, with historical weather at once and the forecast about 14 days out, per Garmin's manuals. MeteoPace says it sends race plans to Garmin and COROS watches. Both were compared from their documentation as of October 2026, not tested.
Can I see the weather for a race that is months away?
Not a forecast, but you can see the history. Racecast and Wyndo show past race-day weather for named marathons, and Garmin's race widget shows historical weather for a race on your calendar. Map your run shows every race day from 2015 to 2024 at Comrades, Berlin, London and Boston, timed to your finish time. Forecasts themselves reach about 10 to 14 days ahead.
Is Apple Weather good enough for planning a run?
For a short run near home, often yes. It gives hourly temperature, feels like, dew point, humidity, wind and UV for free on iPhone. What it can't do is follow you: it forecasts one place, and its feels like doesn't include the breeze you make by running. For a long run, a race or a route that climbs or crosses a city, you need the weather timed to where you'll be.
Can Strava show the weather forecast for a planned route?
Not as of October 2026. Strava has no weather forecast for a planned route, and its community forum carries open requests for one. Third-party add-ons such as Epic Ride Weather fill the gap for cyclists. For a running route, drop the GPX file you export from Strava into a tool that takes route files, such as Map your run or TrueEffort's Pro tier.
Why do two weather apps give different numbers for my run?
Usually because they use different forecast models, grid points or definitions. One app's feels like may assume still air while another adds the breeze you make by running. Some show relative humidity, which swings through the day, while others show dew point, which holds steadier. Check which place and hour each number is for before deciding which to trust.
Do running weather apps cost money?
Most are free to download, then charge for the useful part. As of October 2026, Run Window costs from $5.99 a month after a 7-day trial, Racecast charges $9 once for a Race Plan, MeteoPace's Race Pass costs $8.99 on the US App Store, and Runna costs $19.99 a month. TrueEffort, RunWeather and Good To Run have paid tiers whose prices we couldn't confirm. Dress My Run and Map your run are free in the browser with no account.
Know the heat before you run.
A free RunFast account saves the routes you run with their weather at your pace, puts you on your club’s page, and emails each run’s forecast the evening before. The phone apps, with live tracking, are coming.
Sources and method
- Racecast (2026). About Racecast
- Wyndo (2026). Race weather pages
- MeteoPace (2026). MeteoPace race planning
- RunWeather (2026). RunWeather, the running weather app
- Run Window (2026). Best running weather apps in 2026
- Dress My Run (2026). Dress My Run
- Epic Ride Weather (2026). Epic Ride Weather
- Epic Ride Weather (2026). Frequently asked questions
- Runna (2026). Pricing
- Runna (2026). How does Runna adapt my workouts for heat and humidity?
- Apple App Store (2026). MeteoPace (US listing)
- Medicine & Science in Sports & Exercise (2007). Impact of weather on marathon-running performance (Ely, Cheuvront, Roberts and Montain)
We compared these apps; we did not install or test them. Features come from each app's own website, App Store listing, help pages or manuals, and from named third-party reports, all checked in October 2026. "Free" means free to download, from Apple's iTunes lookup. Prices are in US dollars and appear only where the app's own page or listing showed them; where no page showed a price, we say so rather than quote a price-tracker figure. App Store rating counts are US counts. Map your run is RunFast's own tool and is described from what it does today; we have not published an accuracy test of it, so we make no accuracy claim. Feels like at running pace uses the wind-chill formula (Environment Canada and the US National Weather Service) with the runner's own speed as the airflow, as RunFast's engine does: 0 °C (32 °F) in still air at 10 km/h (6.2 mph) gives about −4 °C (24 °F). The Berlin 2021 figures come from RunFast's race-history data (ERA5 hourly reanalysis along the course, 2015–2024). Dew point bands are RunFast's own grading.
Wes Thomson
Wes Thomson builds RunFast, which times the heat, humidity and dew point to a runner's own pace along the route, and its sister Windline, live wind forecasts for cyclists. Both run on the same forecast engine. He writes these guides with one focus: what the weather will do to your run, kilometre by kilometre, and how to plan around it.