Tuesday, July 21, 2026 · Hour-by-hour forecast updated 9:24 AM EDT
69°F and overcast at peak. Wind 8 mph from the SSW, dew point 65°F.
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 with a peak FitScore of 69/100. Check the hourly breakdown above for detailed conditions throughout the day.
The best months for running in Boston are May, June, September, October. The most challenging months are typically January, February. Charles River Esplanade catches a breeze — great for humid summer mornings.
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.