Monday, October 19, 2026 · Hour-by-hour forecast updated 12:15 AM PDT
65°F and clear at peak. Wind 3 mph from the ENE, dew point 46°F.
December and January are the best running months in San Diego, scoring 95 and 94 on the FitScore scale with mornings near 48°F and afternoon highs around 64°F. There is no truly bad month here — even August, the weakest, averages a FitScore of 72. Across the full year, San Diego ranks #49 of 200 U.S. running cities, with an annual FitScore of 87 (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 5 AM–8 AM with a peak FitScore of 97/100. Check the hourly breakdown above for detailed conditions throughout the day.
The best months for running in San Diego are December, January, and November, with average FitScores of 95, 94, and 94 based on a decade of daily weather history. The most challenging is August (FitScore 72). Marine layer keeps mornings cool. Coastal runs are 10°F cooler than inland.
Historically, October in San Diego averages a FitScore of 85/100 — excellent running weather — with highs around 75°F, lows around 60°F, dew points near 56°F, and 0.9 days of measurable rain. That's about even with 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.