Conditions on this page are recalculated from the latest forecast every time it is opened, for the current date in the location's own time zone.
The ideal running temperature is 7–15°C (45–59°F) with wind under 15 km/h and humidity below 60%. Elite marathon runners perform best around 10°C. Running above 30°C significantly increases heat stroke risk. Reduce intensity by 20–30%, run early morning, and hydrate every 15 minutes. Above 35°C, consider indoor alternatives. You can run safely down to -15°C with proper layering. The real danger is wind chill — if feels-like temperature drops below -20°C, airways can be damaged during intense effort. Humidity above 70% reduces your body's cooling efficiency. A 25°C run at 80% humidity feels like 32°C. Check the "feels-like" temperature, not just air temperature. The exact weather conditions for optimal running performance. Temperature sweet spots, wind thresholds, and humidity limits — backed by sport science. Most runners check temperature. Smart runners check feels-like temperature. Elite runners check the dew point. The difference between a PR and a DNF often comes down to weather factors most people ignore. Running performance follows a clear temperature curve. At 10°C, your body achieves the best balance between heat generation and dissipation. Every degree above 15°C costs you roughly 1% in performance. Humidity is the most underrated running weather factor. At 80% humidity, your sweat doesn't evaporate — your primary cooling system fails. A 22°C run at 85% humidity is harder than a 28°C run at 40% humidity.
Scores are capped by dealbreakers — heavy rain, dangerous wind, thick fog or hazardous UV pull a day down no matter how pleasant the rest of the numbers look. Forecast data is Open-Meteo; solar and lunar values are computed for Best Weather For Running's own coordinates and time zone. Full details on the methodology page.