O'Fallon, Missouri Weather:
Tuesday, September 29, 2026
Cloudy Weather
Day 79°
Night 54°
Precipitation 49 %
Wind 6 mph
UV Index (0 - 11+) 5
Weather Forecast History
Last Year's Weather on This Day (September 29, 2025)
Night

Day

88°

Night

55°

Wind

4 mph

Precipitation

0 %