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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. And when nothing in range is decent, it says that instead of inventing a good answer.

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.

It never invents an answer. If nothing in your range clears the bar, you get that verdict with the least-bad option named and its concerns spelled out. If your range reaches past the hourly forecast horizon (about 7 days), the search stops at the last forecast hour and says so. “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.