HeatPace

Dew point wrecks your pace more than temperature does. Heat reads both and tells you what to run today.

75°F in Arizona is fine. 75°F in Georgia isn't.

Runners fixate on temperature, but dew point is what actually wrecks a run — when the air is already saturated, sweat can't evaporate, you can't cool down, and your pace collapses at the same effort. That's the whole idea behind Heat.

Open the app and it already knows: your current location, the temperature, and the dew point. Enter your goal pace, and Heat tells you exactly what to run today instead — adjusted for how hard the air is actually working against you.

Built on the same temperature-plus-dew-point method coaches have used for years, with one detail almost every calculator misses: interval workouts get half the adjustment, because the recovery between reps gives you a chance to cool. Toggle Easy/Long or Intervals and the number updates.

One screen. No account. No login. No history to scroll through. Just today's number.

— Live weather from Apple Weather, read automatically for your location — Adjusted pace in seconds, not vague advice — Miles or kilometers — Easy/Long vs. Intervals — the two need different math — No ads, no subscription, no tracking

Weather data provided by Apple Weather.