How GoodDayTo judges running weather
Running comfort changes quickly through a day. A warm afternoon can be much less appealing than an early morning, while a windy hour can feel very different from the temperature alone. GoodDayTo compares upcoming hours and shows the strongest running window rather than giving one all-day label.
- Apparent temperature
- Rain probability
- Wind speed
- UV index
- Daylight
🌞 Make the most of the good window
- Use the score to choose a comfortable time, then adjust for your fitness and training plan.
- Hydration and heat precautions still matter even when the weather score is good.
- In low light, choose visible clothing and an appropriate route.
Using the running score for different workouts
Easy runs, intervals and long runs do not place the same demands on the body, so use the score as a weather guide rather than a training prescription. Comfortable apparent temperature, low rain risk and moderate wind help the score. Strong UV, heat, heavy rain or gusts push it down. A WAIT result often means an early-morning or evening window is materially more comfortable than the current hour.
For a hard session or long run, favour the cooler end of the good window and consider the whole route exposure. For a short recovery run, you may personally accept conditions that GoodDayTo rates as mixed. Hydration, clothing and route choice can change how the same weather feels.
What the running score cannot know
The tool does not know your fitness, health, acclimatisation, pace, elevation, trail condition or access to shade and water. It does not replace heat, lightning or air-quality warnings. If you have a medical reason to limit exertion in heat or cold, follow professional guidance rather than the activity score.
What the score means
GO means the weather signals we can measure look favourable. WAIT means conditions are mixed and a better hour may be nearby. NOT TODAY means the forecast currently contains enough unfavourable signals that this activity is unlikely to be a good weather choice. These are planning recommendations, not safety clearances.
Frequently asked questions
What weather does the running score prefer?
Generally mild temperatures, low rain risk and manageable wind. Strong heat, high UV, heavy rain and strong wind reduce the score.
Does it use apparent temperature?
Yes. Apparent temperature helps reflect how conditions may feel rather than relying only on measured air temperature.
Is a high score a safety guarantee?
No. It is a weather-planning score. Your health, route, air quality, traffic and local warnings still matter.