Monday, October 19, 2026 · Hour-by-hour forecast updated 1:12 AM MDT
63°F and clear at peak. Wind 2 mph from the NE, dew point 32°F.
Running in Denver peaks twice a year — September (FitScore 96) and June (94) — with typical morning lows of 52°F and 55°F respectively. January is the limiting month, with average lows of 15°F and highs of only 41°F pulling its FitScore down to 64. Across the full year, Denver ranks #61 of 200 U.S. running cities, with an annual FitScore of 83 (national median: 74). 9 months of the year score 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 100/100. Check the hourly breakdown above for detailed conditions throughout the day.
The best months for running in Denver are September, June, and August, with average FitScores of 96, 94, and 93 based on a decade of daily weather history. The most challenging is January (FitScore 64). Altitude means stronger UV — wear sunscreen even when it's cool. Afternoon thunderstorms are common June–August.
Historically, October in Denver averages a FitScore of 91/100 — excellent running weather — with highs around 66°F, lows around 38°F, dew points near 29°F, and 3.5 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.