Tuesday, July 21, 2026 · Hour-by-hour forecast updated 7:25 AM MDT
67°F and clear at peak. Wind 4 mph from the WSW, dew point 52°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 Thornton are May, June, September, October. The most challenging months are typically December, January. Altitude means stronger UV and thinner air. Wear sunscreen and ease into intensity. Afternoon thunderstorms are common.
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.