Weather forecast for: O'Fallon IL
Last Update: 4:41 pm CST Nov 2, 2026
Tonight: Mostly cloudy, with a low around 63. Breezy, with a south wind 16 to 21 mph, with gusts as high as 30 mph.
Tuesday: A chance of rain and thunderstorms, then rain and possibly a thunderstorm after 3pm. High near 75. Breezy, with a south wind 20 to 25 mph, with gusts as high as 34 mph. Chance of precipitation is 100%.
Tuesday Night: Rain and possibly a thunderstorm before 1am, then a slight chance of rain between 1am and 2am. Low around 55. South wind 8 to 17 mph, with gusts as high as 24 mph. Chance of precipitation is 100%.
Wednesday: Partly sunny, with a high near 65. West wind 8 to 14 mph.
Wednesday Night: Mostly clear, with a low around 46. Southwest wind around 6 mph.
Thursday: Sunny, with a high near 67.
Thursday Night: A 20 percent chance of rain before midnight. Partly cloudy, with a low around 46.
Friday: Mostly sunny, with a high near 60.
Friday Night: Partly cloudy, with a low around 41.
Saturday: Partly sunny, with a high near 58.
Saturday Night: Partly cloudy, with a low around 38.
Sunday: Mostly sunny, with a high near 61.
Sunday Night: Partly cloudy, with a low around 38.
Monday: Sunny, with a high near 61.
WeatherWorld.com
