| WXSIM Forecast for:
O'Fallon Issued by: OFallonweather.com |
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| Updated: Friday, 06-Mar-2026 04:00 pm | ||||||||||||||||||||||||||||||||||||||||||||||||
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| Tonight |
Partly cloudy in the evening, becoming cloudy after midnight. A slight chance of rain in the evening, then a chance of rain after midnight. Scattered thundershowers possible. Breezy and mild. Low 60°. Wind south-southwest around 12 mph, gusting to 27 mph. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch. |
| Saturday |
Cloudy in the morning, becoming mostly cloudy in the afternoon. Patchy light fog in the morning. A chance of rain in the morning, then a slight chance of rain in the afternoon. Precipitation showery or intermittent. Mild. High 66°. UV index up to 4. Wind west-southwest around 10 mph, gusting to 28 mph. Chance of precipitation 40 percent. Precipitation mostly less than a tenth of an inch. |
| Saturday night |
Partly cloudy in the evening, becoming fair after midnight. Patchy light fog after midnight. Low 39°. Wind west-northwest around 5 mph, gusting to 26 mph. |
| Sunday |
Mostly sunny in the morning, becoming sunny in the afternoon. Patchy light fog in the morning. Mild. High 67°. UV index up to 4. Wind west-southwest around 7 mph, gusting to 25 mph. |
| Sunday night |
Clear. Patchy light fog after midnight. Low 41°. Wind west-southwest around 7 mph, gusting to 19 mph. |
| Monday |
Sunny. Patchy light fog in the morning. Unusually warm. High 76°. UV index up to 4. Wind west-southwest around 10 mph, gusting to 28 mph. |
| Monday night |
Fair in the evening, becoming partly cloudy after midnight. Patchy light fog after midnight. Relatively mild. Low 50°. Wind south-southwest around 6 mph, gusting to 19 mph. |
| Tuesday |
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. Scattered thunderstorms likely. Unusually warm. High 75°. Wind south-southwest around 8 mph, gusting to 20 mph, in the morning, becoming 12 mph, gusting to 25 mph, in the afternoon. Chance of precipitation 60 percent. Precipitation mostly less than a quarter of an inch. |
| Tuesday night |
Dense overcast. Patchy light fog in the evening, then light to moderate fog after midnight. Rain. Scattered thunderstorms likely. Unusually warm. Low 62°. Wind south-southwest around 10 mph, gusting to 20 mph. Chance of precipitation 90 percent. Precipitation mostly around an inch. |
| Wednesday |
Dense overcast in the morning, becoming cloudy in the afternoon. Light to moderate fog. Rain likely in the morning, then a chance of rain in the afternoon. Scattered thunderstorms likely. Mild. High 64°, but temperatures falling in the afternoon. Wind northwest around 11 mph, gusting to 29 mph. Chance of precipitation 80 percent. Precipitation mostly around an inch. |
| Wednesday night |
Mostly cloudy to cloudy in the evening, becoming mostly clear after midnight. Light to moderate fog in the evening, then moderate to dense fog after midnight. A chance of rain. Low 38°. Wind north-northwest around 10 mph, gusting to 28 mph, in the evening, becoming 7 mph, gusting to 22 mph, after midnight. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch. |
| Thursday |
Sunny. Moderate to dense fog in the morning, then patchy light fog in the afternoon. High 54°. UV index up to 5. Wind northwest around 4 mph, gusting to 20 mph, in the morning, becoming south-southwest in the afternoon. |
| Thursday night |
Clear in the evening, becoming mostly clear after midnight. Patchy light fog. Low 40°. Wind south around 5 mph, gusting to 19 mph, in the evening, becoming 10 mph, gusting to 16 mph, after midnight. |
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