Monday, October 19, 2026 · Hour-by-hour forecast updated 12:15 AM PDT
59°F and overcast at peak. Wind 9 mph from the W, dew point 48°F.
Running in San Francisco peaks twice a year — May (FitScore 91) and November (91) — with typical morning lows of 52°F and 50°F respectively. There is no truly bad month here — even August, the weakest, averages a FitScore of 85. Across the full year, San Francisco ranks #42 of 200 U.S. running cities, with an annual FitScore of 88 (national median: 74). Conditions stay runnable nearly year-round, with 12 months scoring 70 or better.
Based on 2015–2024 daily weather history (Open-Meteo ERA5), scored against 200 U.S. cities. Monthly FitScore reflects each day’s best running window.
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 All day with a peak FitScore of 98/100. Check the hourly breakdown above for detailed conditions throughout the day.
The best months for running in San Francisco are May, November, and April, with average FitScores of 91, 91, and 90 based on a decade of daily weather history. The most challenging is August (FitScore 85). Karl the Fog burns off by 11 AM most days. Embarcadero is wind-sheltered.
Historically, October in San Francisco averages a FitScore of 90/100 — excellent running weather — with highs around 69°F, lows around 55°F, dew points near 51°F, and 2.3 days of measurable rain. That's above the national median of 86 for October.
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.