Monday, October 19, 2026 · Hour-by-hour forecast updated 12:11 AM PDT
61°F and clear at peak. Wind 3 mph from the E, dew point 55°F.
Running in Irvine peaks twice a year — January (FitScore 95) and April (95) — with typical morning lows of 48°F and 53°F respectively. There is no truly bad month here — even August, the weakest, averages a FitScore of 75. Across the full year, Irvine ranks #41 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 5 AM–8 AM with a peak FitScore of 87/100. Check the hourly breakdown above for detailed conditions throughout the day.
The best months for running in Irvine are January, April, and November, with average FitScores of 95, 95, and 95 based on a decade of daily weather history. The most challenging is August (FitScore 75).
Historically, October in Irvine averages a FitScore of 86/100 — excellent running weather — with highs around 80°F, lows around 60°F, dew points near 53°F, and 1.1 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.