How to use the Workout Weather Planner

Workout Weather Planner finds the best time to start a workout from the forecast for your location, up to 16 days ahead.

Open the Workout Weather Planner

How to use it

Set the date, workout duration and your time window (earliest start, latest finish). Then enter a place name or coordinates.
Optionally import a planned workout from Intervals.icu to fill in the date and duration.
Pick a conditions preference: Cool & dry, Mild, Warm, or Custom with your own ideal temperature and weightings.
Read the timeline and up to four suggested start times, at least an hour apart, each with the reasons it scored well.

How it works

Each possible start time gets a score from 0 to 100, averaged over the whole workout. The score combines how close the feels-like temperature is to your ideal (feels-like already accounts for humidity and wind), rain amount and chance, wind, humidity (only when it's warm) and UV (only when it's high). The forecast comes from Open-Meteo, sent directly to your browser.

Heat makes a real difference. In an analysis of 6 to 36 years of results from each of seven major marathons, finishing times slowed steadily as conditions warmed from 5 to 25 °C wet-bulb globe temperature, and slower runners were affected more than the fastest (Ely et al., 2007).

References

Ely MR, Cheuvront SN, Roberts WO, Montain SJ. Impact of weather on marathon-running performance. Med Sci Sports Exerc. 2007. PubMed

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RunTK's tools are for planning and education. They aren't medical advice, and the right numbers for you depend on your health, experience and goals.