Monday, October 19, 2026 · Hour-by-hour forecast updated 12:13 AM PDT
57°F and overcast at peak. Wind 2 mph from the SSW, dew point 49°F.
May and June are the best running months in Seattle, scoring 92 and 91 on the FitScore scale with mornings near 49°F and afternoon highs around 64°F. December averages 16 days of measurable rain — the wettest stretch of the year — holding its FitScore to 66. Across the full year, Seattle ranks #72 of 200 U.S. running cities, with an annual FitScore of 81 (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 99/100. Check the hourly breakdown above for detailed conditions throughout the day.
The best months for running in Seattle are May, June, and July, with average FitScores of 92, 91, and 90 based on a decade of daily weather history. The most challenging is December (FitScore 66). Seattle summers are world-class running weather — dry, 65–75°F, long daylight.
Historically, October in Seattle averages a FitScore of 86/100 — excellent running weather — with highs around 59°F, lows around 48°F, dew points near 47°F, and 11.1 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.