| WXSIM Forecast for:
O'Fallon Issued by: OFallonweather.com |
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| Updated: Thursday, 02-Apr-2026 05:00 am | ||||||||||||||||||||||||||||||||||||||||||||||||
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| Today |
Cloudy in the morning, becoming mostly cloudy in the afternoon. Rain likely. Thunderstorms very likely, some severe. Breezy and warm. High 76°. UV index up to 4. Wind south around 12 mph, gusting to 28 mph, in the morning, becoming 16 mph, gusting to 31 mph, in the afternoon. Chance of precipitation 70 percent. Precipitation mostly around a quarter of an inch. |
| Tonight |
Fair to partly cloudy in the evening, becoming partly cloudy after midnight. Light to moderate fog after midnight. A chance of rain. Scattered thunderstorms likely, some possibly severe. Mild. Low 65°. Wind south-southwest around 11 mph, gusting to 29 mph, in the evening, becoming 5 mph, gusting to 16 mph, after midnight. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch. |
| Friday |
Mostly cloudy to cloudy. Patchy light fog in the morning. A slight chance of rain in the morning, then a chance of rain in the afternoon. Scattered thunderstorms likely, some possibly severe. Unusually warm. High 79°. Wind south-southeast around 6 mph, gusting to 26 mph, in the morning, becoming 10 mph, gusting to 27 mph, in the afternoon. Chance of precipitation 30 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 severe. Mild. Low 63°. Wind south around 9 mph, gusting to 24 mph, in the evening, becoming southwest after midnight. Chance of precipitation 80 percent. Precipitation mostly around half an inch. |
| Saturday |
Cloudy in the morning, becoming partly to mostly cloudy in the afternoon. Light to moderate fog in the morning, then patchy light fog in the afternoon. Rain likely in the morning, then a slight chance of rain in the afternoon. Scattered thundershowers possible. High 64°, but temperatures falling in the afternoon. UV index up to 5. Wind northwest around 10 mph, gusting to 29 mph. Chance of precipitation 60 percent. Precipitation mostly between a quarter and half an inch. |
| Saturday night |
Clear. Patchy light fog. Low 46°. Wind northwest around 7 mph, gusting to 27 mph. |
| Sunday |
Sunny. Patchy light fog in the morning. High 56°. UV index up to 6. Wind northwest around 10 mph, gusting to 28 mph. |
| Sunday night |
Clear. Low 42°. Wind northwest around 6 mph, gusting to 23 mph, in the evening, becoming west-southwest after midnight. |
| Monday |
Sunny in the morning, becoming mostly sunny in the afternoon. High 60°. UV index up to 6. Wind northwest around 9 mph, gusting to 27 mph. |
| Monday night |
Partly to mostly cloudy in the evening, becoming fair to partly cloudy after midnight. Low 41°. Wind north-northwest around 7 mph, gusting to 23 mph. |
| Tuesday |
Sunny. High 55°. UV index up to 6. Wind north-northeast around 7 mph, gusting to 27 mph, in the morning, becoming east-northeast in the afternoon. |
| Tuesday night |
Mostly clear in the evening, becoming partly to mostly cloudy after midnight. Low 40°. Wind east-southeast around 7 mph, gusting to 24 mph. |
| Wednesday |
Partly cloudy in the morning, becoming sunny in the afternoon. Breezy. High 62°. UV index up to 7. Wind east-southeast around 10 mph, gusting to 29 mph, in the morning, becoming south-southeast around 13 mph, gusting to 30 mph, in the afternoon. |
| Wednesday night |
Clear. Low 44°. Wind south-southeast around 9 mph, gusting to 27 mph. |
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