Tuesday, July 21, 2026 · Hour-by-hour forecast updated 8:24 AM CDT
62°F and overcast at peak. Wind 12 mph from the NNW, dew point 51°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–9 AM with a peak FitScore of 93/100. Check the hourly breakdown above for detailed conditions throughout the day.
The best months for running in Chicago are April, May, September, October. The most challenging months are typically January, February. Lakefront trail gets breezy — run along the water for natural cooling.
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.