| WXSIM Forecast for:
O'Fallon Issued by: OFallonweather.com |
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| Updated: Wednesday, 01-Apr-2026 05:00 am | ||||||||||||||||||||||||||||||||||||||||||||||||
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| Today |
Dense overcast in the morning, becoming cloudy in the afternoon. Rain likely. Thunderstorms very likely, some severe. High 61°. Wind northeast around 4 mph. Chance of precipitation 60 percent. Precipitation mostly less than a quarter of an inch. |
| Tonight |
Mostly cloudy to cloudy. Patchy light fog in the evening, then light to moderate fog after midnight. A chance of rain in the evening, then a slight chance of rain after midnight. Precipitation showery or intermittent. Low 50°. Wind east-northeast around 7 mph in the evening, becoming south-southeast after midnight. Chance of precipitation 40 percent. Precipitation mostly less than a tenth of an inch. |
| Thursday |
Dense overcast in the morning, becoming mostly cloudy in the afternoon. A slight chance of rain in the morning, then a chance of rain in the afternoon. Scattered thunderstorms likely, some possibly severe. Breezy and warm. High 74°. Wind south around 13 mph, gusting to 24 mph, in the morning, becoming 17 mph, gusting to 31 mph, in the afternoon. Chance of precipitation 30 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. Mild. Low 62°. Wind south around 14 mph, gusting to 30 mph, in the evening, becoming 7 mph, gusting to 19 mph, after midnight. |
| Friday |
Mostly 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 severe. Unusually warm. High 78°. Wind south around 8 mph, gusting to 25 mph, in the morning, becoming 12 mph, gusting to 27 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 cloudy after midnight. Patchy light fog in the evening, then 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 65°. Wind south-southwest around 9 mph, gusting to 23 mph. Chance of precipitation 80 percent. Precipitation mostly around half an inch. |
| Saturday |
Dense overcast in the morning, becoming partly to mostly cloudy in the afternoon. Light to moderate fog. Rain likely. Thunderstorms very likely, some possibly severe. High 67°, but temperatures falling in the afternoon. Wind west around 10 mph, gusting to 28 mph. Chance of precipitation 80 percent. Precipitation mostly around 2 inches. |
| Saturday night |
Clear. Light to moderate fog in the evening, then moderate fog after midnight. Low 45°. Wind west-northwest around 9 mph, gusting to 27 mph. |
| Sunday |
Sunny. Moderate fog in the morning. High 55°. UV index up to 6. Wind west-northwest around 10 mph, gusting to 28 mph. |
| Sunday night |
Clear. Low 42°. Wind west-northwest around 5 mph, gusting to 23 mph. |
| Monday |
Sunny in the morning, becoming partly to mostly sunny in the afternoon. High 61°. UV index up to 6. Wind northwest around 7 mph, gusting to 25 mph. |
| Monday night |
Mostly cloudy in the evening, becoming dense overcast after midnight. A slight chance of rain in the evening, then rain likely after midnight. Low 43°. Wind north-northeast around 7 mph, gusting to 21 mph. Chance of precipitation 60 percent. Precipitation mostly around a quarter of an inch. |
| Tuesday |
Partly cloudy in the morning, becoming sunny in the afternoon. A chance of rain. Breezy. High 51°. UV index up to 8. Wind north-northeast around 11 mph, gusting to 29 mph. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch. |
| Tuesday night |
Partly cloudy in the evening, becoming mostly cloudy to cloudy after midnight. Low 40°. Wind east-northeast around 9 mph, gusting to 25 mph. |
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