Saturday, April 11, 2026 · Hour-by-hour forecast updated 9:43 AM PDT
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FitCast texts you tomorrow's hour-by-hour forecast every evening so you know exactly what to expect before your alarm goes off.
Based on today's FitScore analysis, the best time to run is Weather temporarily unavailable with a peak FitScore of 0/100. Check the hourly breakdown above for detailed conditions throughout the day.
The best months for running in San Francisco are September, October, April, May. The most challenging months are typically July (fog), December (rain). Karl the Fog burns off by 11 AM most days. Embarcadero is wind-sheltered.
FitScore rates each hour from 0–100 for outdoor exercise based on temperature, humidity, dew point, wind, precipitation probability, UV index, and air quality. Higher scores mean better conditions.