Weather forecast for: O'Fallon IL
Last Update: 9:46 pm CST Nov 4, 2026
Tonight: Mostly clear, with a low around 45. Southwest wind around 7 mph.
Thursday: Increasing clouds, with a high near 61. West wind 6 to 13 mph.
Thursday Night: A slight chance of rain between 9pm and 10pm. Mostly cloudy, with a low around 46. Northwest wind 5 to 8 mph. Chance of precipitation is 20%.
Friday: Partly sunny, with a high near 54. North wind 8 to 13 mph.
Friday Night: Mostly clear, with a low around 34. North wind 5 to 7 mph becoming calm in the evening.
Saturday: Sunny, with a high near 54.
Saturday Night: Mostly clear, with a low around 33.
Sunday: Sunny, with a high near 59.
Sunday Night: Clear, with a low around 36.
Monday: Sunny, with a high near 65.
Monday Night: Clear, with a low around 41.
Tuesday: Sunny, with a high near 65.
Tuesday Night: Mostly clear, with a low around 42.
Veterans Day: Sunny, with a high near 65.
WeatherWorld.com
