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For runners · free, no account needed

When’s the best time to run?

Pick your run length and a range — Wyndo’s decision engine scores start times every 5–15 minutes across your range against heat, humidity, wind, rain, air quality, and daylight, and names the window. If none clears the threshold, it labels a least-bad option when available or explains why no window is recommendable.

Your run

How long?
When?
Where?

How it works — and what it won’t do

Every window and score comes from Wyndo’s decision engine verbatim — the same engine behind Ask. It scans candidate start times at 5–15 minute resolution across your range, scoring each against a run-tuned profile: heat index, dew point, wind and gusts, rain, air quality, UV, and daylight. Hard limits work veto-first — a window past a safety threshold is excluded outright, not averaged away.

If nothing in your range clears the bar, the planner names the least-bad option and spells out its concerns. If your range reaches past the hourly forecast horizon (about 7 days), the search stops at the last forecast hour and states the cutoff. “This weekend” means all day Saturday and Sunday, midnight to midnight, in the run location’s timezone.

A green window is a weather read, not a promise — course, footing, and how you feel on the day are yours to judge.