Tuesday, July 21, 2026 · Hour-by-hour forecast updated 8:26 AM CDT
75°F and mostly sunny at peak. Wind 3 mph from the WNW, dew point 72°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 7 AM with a peak FitScore of 53/100. Check the hourly breakdown above for detailed conditions throughout the day.
The best months for running in San Antonio are October, November, March, April. The most challenging months are typically June, July, August. Triple-digit heat is common. Pre-dawn is the only safe window — carry extra water.
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.