The short answer
The best free running weather app is often not an app at all. Dress My Run suggests what to wear, Apple Weather shows dew point on any iPhone, and Route Forecast and GPX Forecast time the weather along a route file. RunFast's Map your run adds feels like and heat stress at your pace, kilometre by kilometre, with no login.
Key takeaways
- Several good running weather tools cost nothing and need no account, as of October 2026.
- Free route tools are mostly built for cyclists and skip dew point and heat stress.
- Free heat-adjusted pace calculators take one temperature, not a race that warms up.
- Paid apps mainly add alerts, hourly scores, watch support and training plans.
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 |
|---|---|---|---|---|---|---|
| RunFast Map your run Ours | Heat along your own route at your pace, kilometre by kilometre | Free, no account | ✓ | ✓ | ✓ | ✓ |
| Route Forecast | Wind and rain along a route, stretch by stretch | Free; optional donation | ✓ | ? | ? | ? |
| GPX Forecast | Weather at every kilometre of a GPX route | Price not shown | ✓ | ? | ? | ? |
| FindMyMarathon | Named marathons, timed to your goal finish | Free | ◐ | ? | ✓ | ? |
| Racecast | Free race-day forecasts for named races | Forecasts free; Race Plan $9 once | – | ? | ? | ? |
| Dress My Run | What to wear, in the browser | Free | – | – | ? | – |
| Apple Weather | An everyday hourly forecast with dew point | Free on iPhone | – | – | ✓ | ? |
| Running Writings calculator | A heat-adjusted pace from a published model | Free, open source | – | ✓ | ◐ | ? |
| Hadley's chart | A quick pace adjustment you can do in your head | Free | – | ◐ | ◐ | ? |
| Wyndo pace calculator | A heat-adjusted pace range backed by four studies | Free; paid tier not shown | – | ✓ | ◐ | ◐ |
✓ yes ◐ partly – no. Facts from each maker's own pages, as of October 2026.
On this page
- What is the best free running weather app with no login?
- How did we choose these free tools?
- How do the free running weather tools compare?
- Which free tools check the weather along your route?
- Which free tools tell you what to wear and when to run?
- Which free calculators adjust your pace for the heat?
- What do you give up by staying free?
- 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.
- Route file
- A GPX, FIT or TCX file holding your route's path and height, exported from Strava, Garmin Connect, Komoot or a race website.
What is the best free running weather app with no login?
The best free running weather app depends on your question, and several good ones run in a browser with no account. For what to wear, use Dress My Run. For the weather along your route at your pace, use a route tool such as Map your run.
For the paid apps, read our comparison of 15 running weather apps. We compared these free tools from their sites as of October 2026; we did not test them.
How did we choose these free tools?
Each tool had to give its forecast free, with no subscription, and we flag any account it needs. We left out free downloads that keep the useful part behind a Pro tier, and apps that need installing, except Apple Weather, which every iPhone already has.
We judged each on what runners need: a min:sec pace, dew point, feels like at running pace and heat stress. Many free tools were built for cyclists, who set a speed, not a pace.
How do the free running weather tools compare?
Two give kit advice, four follow a route, and three calculators adjust pace for heat. One combines your own route file with dew point and heat stress.
| Tool | Best for | Follows your route | Dew point or heat stress | Cost, as of October 2026 | Account |
|---|---|---|---|---|---|
| Map your run (ours) | Heat along your route at your pace | Yes, GPX, FIT or TCX | Both, per kilometre or mile | Free | None |
| Route Forecast | Wind and rain along a route | Yes | Neither described | Free (optional donation) | None |
| GPX Forecast | Weather every km of a GPX | Yes | Neither shown | Price page not found | None |
| FindMyMarathon | Named marathons at your goal time | Start, halfway, finish | Dew point | Free | Not stated |
| Racecast | Race-day forecasts | Named races | RunScore (0–10) | Forecasts free; Race Plan $9 | Invite-only accounts |
| Dress My Run | What to wear | No | Neither | Free | None |
| Apple Weather | Everyday hourly forecast | No | Dew point | Free on iPhone | None |
| Running Writings calculator | Heat-adjusted pace | No | Dew point input | Free, open source | None |
| Hadley chart | Quick pace adjustment | No | Dew point input | Free | None |
Which free tools check the weather along your route?
Four do. The cycling-first tools are strong on wind; the running tools on heat.
Route Forecast gives stretch-by-stretch wind, temperature and rain, a best start time and kit tips, from GPX, FIT or TCX files. It's free, with an optional donation, and cycling-led: we saw no dew point or WBGT.
Best forWind and rain along a route, stretch by stretch
Strengths
- Stretch-by-stretch wind, temperature and rain
- A best start time and kit tips
- Supports running; no account
Limits
- Cycling-led
- No dew point or WBGT described
Checked October 2026
GPX Forecast (launched 8 May 2026) takes a GPX, a pace and a start time, and shows temperature, wind and rain at every kilometre, with no account. It's aimed at cyclists, hikers and trail runners, with no heat-stress model.
Best forWeather at every kilometre of a GPX route
Strengths
- Drop a GPX, set a pace and a start time
- Temperature, wind and rain at every kilometre
- In the browser, no account
Limits
- Aimed at cyclists, hikers and trail runners
- No heat-stress or dew point model visible
- New: launched 8 May 2026
Checked October 2026
FindMyMarathon is free and built around your finish. Pick a named race such as Chicago or New York, your start wave and goal time, and it shows the weather, dew point included, at the start, halfway and finish.
Best forNamed marathons, timed to your goal finish
Strengths
- Your start wave and goal time set the timing
- Temperature, wind, humidity, dew point and rain at start, halfway and finish
- Wind by segment
Limits
- Named races only
- About five points per race
- Data source not disclosed
Checked October 2026
Racecast also forecasts named races free; its Race Plan costs $9.
Best forFree race-day forecasts for named races
Strengths
- A big catalogue of named races
- RunScore (0–10) for how much the weather slows a typical marathoner
- Race-day history articles
Limits
- No upload of your own route
- Account creation is invite-only
Checked October 2026
Map your run is ours. It takes your route file and a pace such as 5:30 per km (8:51 per mile), up to 10 days ahead. Each kilometre gets a hill-adjusted split, dew point, feels like at running pace and WBGT heat-stress level. Our guide to weather along your running route shows how to export the file.
Best forHeat along your own route at your pace, kilometre by 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 link and image, and a 3D flyover
Limits
- Forecasts reach 10 days ahead
- Race-day history for four races so far
- No alerts: you open it when you need it
- No phone app yet: the apps are coming
Checked October 2026
Which free tools tell you what to wear and when to run?
Dress My Run for the outfit, and Apple Weather for the hour. Neither knows your route or pace.
Dress My Run reads the live forecast (Apple Weather, according to Canadian Running in January 2026) and suggests what to wear for the next 24 hours, with a setting for runners who run hot or cold. For the reasoning behind the outfit, read what to wear running at every temperature.
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
Apple Weather is free on iPhone and shows hourly temperature, feels like, dew point, humidity, wind and UV. Its feels like doesn't include the breeze you make by running. At 6:00 per km (9:39 per mile) on a still 0 °C (32 °F) morning, that breeze makes it feel like about −4 °C (24 °F).
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
- iPhone only
Checked October 2026
Which free calculators adjust your pace for the heat?
Three stand out. Each takes one temperature, so none follows a race that warms up.
- Running Writings, by John Davis, PhD, is open source and fitted to the Mantzios and colleagues (2022) data: 3,891 runners in 754 races. It takes °C or °F, and says it isn't reliable above about 32 °C (90 °F).
- Mark Hadley's chart (2013) adds temperature and dew point in °F and reads off a slowdown: a coaching rule of thumb, not a peer-reviewed model.
- Wyndo's calculator cites four studies, gives a range, and stops at a WBGT of about 28 °C (82 °F).
Best forA heat-adjusted pace from a published model
Strengths
- Fitted to the Mantzios et al. (2022) data: 3,891 runners, 754 races
- °C or °F; pace per km or per mile
- Free and open source
Limits
- One set of conditions, not a race that warms up
- Not reliable above about 32 °C (90 °F), it says
Checked October 2026
Best forA quick pace adjustment you can do in your head
Strengths
- Add air temperature and dew point in °F, read off a slowdown
- Simple enough to remember
- Free since 2013
Limits
- A coaching rule of thumb, not a peer-reviewed model
- °F only
- A chart, not an interactive calculator
Checked October 2026
Best forA heat-adjusted pace range backed by four studies
Strengths
- Cites Ely 2007, El Helou 2012, Mantzios 2022 and Vihma 2010
- Gives a range, not one number
- Race pages with start-line history
Limits
- Ignores wind and acclimatisation
- Stops near a WBGT of 28 °C (82 °F)
- Fahrenheit-first
Checked October 2026
Our comparison of heat-adjusted pace calculators works through the same run in each.
What do you give up by staying free?
Reminders, mostly: free browser tools wait for you to open them.
As of October 2026, paid tiers add hourly run scores (RunWeather, WeatherToRun), comfort profiles (Run Window, from $5.99 a month), race plans sent to your watch (MeteoPace) and heat-adjusted training (Runna). If you'd use those weekly, they may be worth it. If you check once before a long run or race, the free tools give you the forecast itself. Official race flags and medical advice override any tool.
Questions runners ask
Is there a free weather tool that reads a GPX file for runners?
Yes. As of October 2026, Map your run, Route Forecast and GPX Forecast all take a route file in the browser without an account. The last two are built mainly for cyclists and hikers. Map your run is built for runners: you set a min:sec pace, and it shows dew point, feels like and WBGT heat stress for each kilometre or mile.
Is Dress My Run free to use?
Yes. As of October 2026, Dress My Run is free in the browser with no account. It reads the live forecast where you are and suggests an outfit for the next 24 hours. It doesn't know your route or pace, so on a long run that climbs or heads into the wind, check the conditions along the way too.
What do paid running weather apps add over the free tools?
Mostly convenience: push alerts, hourly run scores, watch apps, saved locations and race plans. As of October 2026, Run Window costs from $5.99 a month after a 7-day trial, and Racecast charges $9 once for a Race Plan. If you're happy to open a page before you run, the free tools cover the forecast itself.
Can I check a marathon's race-day weather for free?
Yes. Racecast's race forecasts are free, and FindMyMarathon shows the weather at the start, halfway and finish of named races for your goal time. Map your run opens Comrades, Berlin, London and Boston at your finish time, with the forecast in race week and every race day from 2015 to 2024 the rest of the year.
Do I need an account to use Map your run?
No. Map your run works in any phone or computer browser with no sign-up. You drop in a GPX, FIT or TCX route or pick one of four races, then set the day, start time and pace. To share a plan with your club or a pacer, use its share link or share image. Nothing has to be installed.
See the heat at your pace.
Drop in your route (GPX, FIT or TCX), pick the day and your pace, and see the feels like, dew point and heat stress for every kilometre, timed to when you’ll be there. Free, in your browser, no sign-up.
Sources and method
- Route Forecast (2026). Route Forecast, wind and weather for every mile of your route
- GPX Forecast (2026). GPX Forecast
- Dress My Run (2026). Dress My Run
- Wyndo (2026). Race weather pages
- Maximum Performance Running (Mark Hadley) (2013). Temperature + dew point for pace adjustments
- Medicine & Science in Sports & Exercise (via PMC) (2022). Effects of weather parameters on endurance running performance: discipline-specific analysis of 1258 races (Mantzios et al.)
We compared these tools from their own websites and listings and from named reviews, checked in October 2026; we did not test them. A tool counts as free here if its core forecast costs nothing; we say where an account or a paid tier exists. Prices are in US dollars and appear only where the tool's own page showed them. Map your run is RunFast's own tool, described from what it does today, with no accuracy claim. Pace conversions use 1 mile = 1.609 km. The −4 °C (24 °F) feels like comes from the wind-chill formula used by Environment Canada and the US National Weather Service, with the runner's own speed, 10 km/h (6.2 mph), as the airflow in still air, as RunFast's engine does.
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.