Monday, October 19, 2026 · Hour-by-hour forecast updated 12:14 AM PDT
58°F and overcast at peak. Wind 4 mph from the NW, dew point 49°F.
April and May are the best running months in San Jose, scoring 96 and 96 on the FitScore scale with mornings near 49°F and afternoon highs around 69°F. There is no truly bad month here — even August, the weakest, averages a FitScore of 89. That makes San Jose one of the best year-round running cities in the country — #12 of 200, with an annual FitScore of 93 against a national median of 74.
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 100/100. Check the hourly breakdown above for detailed conditions throughout the day.
The best months for running in San Jose are April, May, and June, with average FitScores of 96, 96, and 95 based on a decade of daily weather history. The most challenging is August (FitScore 89).
Historically, October in San Jose averages a FitScore of 94/100 — excellent running weather — with highs around 77°F, lows around 56°F, dew points near 47°F, and 1.8 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.