O'Fallon, Missouri Weather:
Wednesday, September 23, 2026
Cloudy Weather
Day 72°
Night 55°
Precipitation 1 %
Wind 7 mph
UV Index (0 - 11+) 4
Weather Forecast History
Last Year's Weather on This Day (September 23, 2025)
Rainy Weather

Day

75°

Night

64°

Wind

6 mph

Precipitation

98 %