O'Fallon, Missouri Weather:
Thursday, October 15, 2026
Stormy Weather
Day 79°
Night 52°
Precipitation 88 %
Wind 8 mph
UV Index (0 - 11+) 1
Weather Forecast History
Last Year's Weather on This Day (October 15, 2025)
Cloudy Night

Day

82°

Night

57°

Wind

5 mph

Precipitation

10 %