O'Fallon, Missouri Weather:
Saturday, September 26, 2026
Cloudy Weather
Day 75°
Night 55°
Precipitation 55 %
Wind 4 mph
UV Index (0 - 11+) 1
Weather Forecast History
Last Year's Weather on This Day (September 26, 2025)
Night

Day

82°

Night

50°

Wind

4 mph

Precipitation

0 %