| WXSIM Forecast for:
O'Fallon Issued by: OFallonweather.com |
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| Updated: Wednesday, 01-Apr-2026 04:00 pm | ||||||||||||||||||||||||||||||||||||||||||||||||
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| Tonight |
Cloudy. Patchy light fog. A chance of rain. Scattered thunderstorms likely. Low 54°, but temperatures rising after midnight. Wind east around 7 mph in the evening, becoming southeast after midnight. Chance of precipitation 50 percent. Precipitation mostly less than a quarter of an inch. |
| Thursday |
Dense overcast in the morning, becoming partly to mostly cloudy in the afternoon. A slight chance of rain in the morning, then a chance of rain in the afternoon. Thunderstorms very likely, some possibly severe. Breezy and warm. High 76°. UV index up to 4. Wind south around 13 mph, gusting to 26 mph, in the morning, becoming 17 mph, gusting to 33 mph, in the afternoon. Chance of precipitation 40 percent. Precipitation mostly less than a tenth of an inch. |
| Thursday night |
Fair to partly cloudy in the evening, becoming partly cloudy after midnight. Patchy light fog after midnight. A chance of rain. Scattered thunderstorms likely, some possibly severe. Mild. Low 64°. Wind south around 12 mph, gusting to 31 mph, in the evening, becoming 7 mph, gusting to 20 mph, after midnight. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch. |
| Friday |
Cloudy in the morning, becoming mostly cloudy to cloudy in the afternoon. Patchy light fog in the morning. A slight chance of rain in the morning, then a chance of rain in the afternoon. Thunderstorms very likely, some possibly severe. Unusually warm. High 78°. Wind south around 6 mph, gusting to 23 mph, in the morning, becoming 10 mph, gusting to 25 mph, in the afternoon. Chance of precipitation 40 percent. Precipitation mostly less than a tenth of an inch. |
| Friday night |
Mostly cloudy to cloudy in the evening, becoming dense overcast after midnight. Light to moderate fog after midnight. A chance of rain in the evening, then rain likely after midnight. Thunderstorms very likely, some possibly severe. Mild. Low 64°. Wind south-southwest around 8 mph, gusting to 21 mph. Chance of precipitation 80 percent. Precipitation mostly around half an inch. |
| Saturday |
Dense overcast in the morning, becoming partly cloudy in the afternoon. Light to moderate fog. Rain likely in the morning, then a chance of rain in the afternoon. Scattered thunderstorms likely. High 65°, but temperatures falling in the afternoon. UV index up to 5. Wind northwest around 7 mph, gusting to 26 mph, in the morning, becoming 11 mph, gusting to 28 mph, in the afternoon. Chance of precipitation 80 percent. Precipitation mostly between half an inch and one inch. |
| Saturday night |
Mostly clear in the evening, becoming clear after midnight. Patchy light fog after midnight. Low 43°. Wind northwest around 10 mph, gusting to 27 mph. |
| Sunday |
Sunny. Patchy light fog in the morning. High 55°. UV index up to 6. Wind northwest around 10 mph, gusting to 29 mph. |
| Sunday night |
Clear. Low 40°. Wind northwest around 4 mph, gusting to 22 mph. |
| Monday |
Sunny in the morning, becoming mostly sunny in the afternoon. High 61°. UV index up to 6. Wind northwest around 6 mph, gusting to 24 mph. |
| Monday night |
Mostly cloudy in the evening, becoming dense overcast after midnight. A slight chance of rain in the evening, then a chance of rain after midnight. Low 43°. Wind north around 7 mph, gusting to 21 mph. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch. |
| Tuesday |
Cloudy in the morning, becoming partly to mostly cloudy in the afternoon. High 54°. UV index up to 5. Wind east-northeast around 8 mph, gusting to 24 mph. |
| Tuesday night |
Mostly clear in the evening, becoming mostly cloudy to cloudy after midnight. Low 42°. Wind east-southeast around 9 mph, gusting to 21 mph. |
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