🏃 Running

The weather app
built for runners

Sweather scores the weather for your run. A 1–10 running score for every 15-minute slot of the day, so you know when to lace up and when to wait an hour.

Download on the App Store Get it on Google Play
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8.7
Running at 07:00, cool, dry, light tailwind

Generic weather apps tell you the temperature.
Sweather tells you when to run.

A typical weather app says "16°C, partly cloudy, 15% rain." That's just data. Sweather knows what those numbers actually mean for running, and turns them into one score from 1 to 10. Glance at the chart, find the green window, head out.

The running profile weighs the factors that actually slow you down: heat stress, headwind, gust intensity, humidity, dew point, UV index, and rain on the ground. The hot summer afternoon that looks fine in a normal weather app? It might score a 3 for running. Sweather will tell you that, even if you don't want to hear it.

17 factors. Weighted for running.

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Temperature & feels-like

Heat stress curve calibrated for steady-state running effort. Cold rarely caps a score; heat does.

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Wind & gusts

Out-and-back runs care about headwind on the return. Gusts above 50 km/h are flagged as a dealbreaker.

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Humidity & dew point

Above 18°C dew point your cooling stops working. The score reflects that, even if the temperature looks fine.

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Precipitation

Light rain you can run through. Heavy rain or thunder caps the score hard. Radar nowcast tells you when it stops.

☀️

UV index

Long midday efforts in summer get docked for high UV. You see the dip at sunset before you head out.

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Air quality

PM2.5 and ozone above WHO thresholds drag the score down, which matters in high-volume training weeks.

Race day, unlocked.

Pin a marathon, half, 10K or trail race. Sweather counts down, applies forecast-driven scoring inside 16 days, falls back to a 10-year climate average beyond that, and warns you the moment a dealbreaker enters the forecast. More on this in the Race Day feature.

Connect Strava (free, read-only) and Sweather learns the times you actually run, the routes you use, and tunes the scoring to match how you perform. Performance dropped 8% in headwinds above 25 km/h? It picks that up.

Common questions about running weather

What is the best weather for running?
Most runners perform best between 8°C and 15°C with low humidity, light wind under 15 km/h, and minimal rain. Sweather scores all 17 weather factors against this profile and gives you one number from 1 to 10 for every 15-minute slot of the day.
Is Sweather a good weather app for marathon training?
Yes. Sweather's Race Day feature gives you a 5-year temperature history for your race location, a 10-year climate average, and a forecast that sharpens as the race approaches. You see the dealbreakers before they ruin your taper.
Can Sweather sync with Strava for running?
Yes. Connect Strava (read-only, free) and Sweather learns your usual running times, your favourite routes, and tunes the scoring to how you actually perform in different conditions.
What about hot summer runs?
Sweather weighs heat stress and humidity heavily for endurance sports. A 32°C run with 70% humidity gets capped low, even when the rest of the data looks clear. Look for the 6 AM or 9 PM green windows instead.

Stop guessing. Run smart.

Download Sweather and run when the weather actually agrees with you.

Download on the App Store Get it on Google Play