| WXSIM Forecast for:
O'Fallon Issued by: OFallonweather.com |
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| Updated: Friday, 06-Mar-2026 05:00 am | ||||||||||||||||||||||||||||||||||||||||||||||||
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| Today |
Partly cloudy. Exceptionally hot. High 80°. UV index up to 6. Wind south-southeast around 7 mph, gusting to 25 mph, in the morning, becoming 13 mph, gusting to 30 mph, in the afternoon. |
| Tonight |
Partly to mostly cloudy in the evening, becoming cloudy after midnight. A slight chance of rain in the evening, then a chance of rain after midnight. Scattered thunderstorms likely. Unusually warm. Low 63°. Wind south around 10 mph, gusting to 25 mph. Chance of precipitation 50 percent. Precipitation mostly less than a quarter of an inch. |
| Saturday |
Cloudy in the morning, becoming partly to 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. Scattered thunderstorms likely. Mild. High 69°. UV index up to 4. Wind south-southwest around 10 mph, gusting to 29 mph, in the morning, becoming west-northwest in the afternoon. Chance of precipitation 40 percent. Precipitation mostly less than a tenth of an inch. |
| Saturday night |
Partly cloudy in the evening, becoming mostly clear after midnight. Patchy light fog after midnight. Low 42°. Wind west-northwest around 5 mph, gusting to 25 mph. |
| Sunday |
Sunny. Patchy light fog in the morning. Mild. High 68°. UV index up to 4. Wind southwest around 5 mph, gusting to 21 mph, in the morning, becoming 8 mph, gusting to 25 mph, in the afternoon. |
| Sunday night |
Clear. Low 41°. Wind southwest around 6 mph, gusting to 19 mph. |
| Monday |
Sunny. Unusually warm. High 77°. UV index up to 4. Wind southwest around 9 mph, gusting to 27 mph. |
| Monday night |
Clear in the evening, becoming fair to partly cloudy after midnight. Relatively mild. Low 49°. Wind south-southwest around 6 mph, gusting to 18 mph. |
| Tuesday |
Partly cloudy 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. Thunderstorms very likely, some severe. Unusually warm. High 79°. Wind south-southwest around 7 mph, gusting to 20 mph, in the morning, becoming 10 mph, gusting to 25 mph, in the afternoon. Chance of precipitation 60 percent. Precipitation mostly around a quarter of an inch. |
| Tuesday night |
Cloudy in the evening, becoming dense overcast after midnight. Light to moderate fog in the evening, then patchy light fog after midnight. Rain very likely. Thunderstorms very likely, some severe. Unusually mild. Low 59°. Wind southwest around 10 mph, gusting to 22 mph. Chance of precipitation 90 percent. Precipitation mostly between half an inch and one inch. |
| Wednesday |
Dense overcast in the morning, becoming mostly cloudy in the afternoon. Patchy light fog. A chance of rain in the morning, then a slight chance of rain in the afternoon. Scattered thunderstorms likely. Mild. High 60°, but temperatures falling in the afternoon. Wind north-northwest around 9 mph, gusting to 26 mph. Chance of precipitation 50 percent. Precipitation mostly less than a quarter of an inch. |
| Wednesday night |
Partly to mostly cloudy in the evening, becoming cloudy after midnight. Low 42°. Wind north-northwest around 4 mph, gusting to 24 mph. |
| Thursday |
Sunny. Mild. High 60°. UV index up to 5. Wind north-northeast around 5 mph, gusting to 23 mph, in the morning, becoming south-southeast in the afternoon. |
| Thursday night |
Clear. Patchy light fog after midnight. Low 39°. Wind south-southeast around 6 mph, gusting to 21 mph. |
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