Your best window to run
Air temperature, dew point, wind, UV, precipitation, and AQI are scored hour by hour for runners.
Why runners need GoWindow
Why dew point matters
Relative humidity can be misleading. Dew point is a better guide to how sticky the air will feel and how easily sweat can evaporate.
Temperature without double-counting
GoWindow scores the actual air temperature, then handles wind, dew point, and estimated heat stress separately so the same condition is not counted twice.
AQI in the score
Worsening AQI can lower the running score. If AQI is unavailable, smoke or haze in the weather condition is used only as a fallback.
What the running score weighs
How sticky the air feels and how easily sweat can evaporate.
Air temperature is scored against your running preference; wind and dew point are handled separately.
Strong sustained wind lowers the score and can trigger a warning.
Each hour uses the forecast UV index; extreme UV can apply a separate penalty.
AQI above the Good band can lower the score when data is available.
Rain chance and amount are scored for each hour in the window.
When GoWindow helps runners
Picking the cooler slot between a morning and evening run in summer
Deciding whether an air-quality advisory means skipping or just shortening a run
Finding a 1-hour window between rain bands on a rest-day shakeout
Checking whether tomorrow's long-run conditions are worth the alarm
From the blog
AQI and your lungs: what the air quality number means when you're running
When you run, you breathe ten to twenty times harder than at rest. That changes how air pollution lands in your body. Here's what runners should actually do with the AQI number.
Dew point vs humidity: why your weather app lies to runners
Relative humidity tells you almost nothing about how a run will feel. Dew point does. Here's why the distinction matters and how to use it.
Why Timing Matters More Than Temperature
Most people check the temperature before heading out. The best outdoor sessions depend on a narrow window where several conditions line up — not on one number.
When to run in the heat
Compare dew point, sun, wind, air quality, and storms instead of checking temperature alone.
When to run in the heat