| WXSIM Forecast for:
O'Fallon Issued by: OFallonweather.com |
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| Updated: Monday, 10-Aug-2026 05:00 am | ||||||||||||||||||||||||||||||||||||||||||||||||
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| Today |
Partly cloudy in the morning, becoming partly to mostly sunny in the afternoon. A chance of rain in the morning, then a slight chance of rain in the afternoon. Scattered thundershowers possible. Very hot. High 97°. Heat index up to 110°. UV index up to 8. Wind southwest around 8 mph, gusting to 24 mph. Chance of precipitation 40 percent. Precipitation mostly around a tenth of an inch. |
| Tonight |
Partly cloudy in the evening, becoming fair after midnight. Patchy light fog after midnight. A chance of rain. Scattered thundershowers possible. Warm. Low 77°. Wind southwest around 5 mph, gusting to 18 mph. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch. |
| Tuesday |
Partly to mostly sunny in the morning, becoming partly cloudy in the afternoon. Patchy light fog in the morning. A chance of rain. Scattered thunderstorms likely. Hot. High 95°. Heat index up to 109°. UV index up to 8. Wind southwest around 8 mph, gusting to 25 mph. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch. |
| Tuesday night |
Partly cloudy in the evening, becoming fair to partly cloudy after midnight. Low 76°. Wind southwest around 4 mph. |
| Wednesday |
Partly cloudy 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. Hot. High 94°. Heat index up to 104°. UV index up to 6. Wind west-southwest around 6 mph, gusting to 24 mph. Chance of precipitation 40 percent. Precipitation mostly around a tenth of an inch. |
| Wednesday night |
Partly cloudy in the evening, becoming fair after midnight. Patchy light fog after midnight. Low 75°. Wind south around 4 mph. |
| Thursday |
Partly cloudy in the morning, becoming mostly sunny in the afternoon. Very hot. High 96°. Heat index up to 108°. UV index up to 9. Wind east-southeast around 5 mph, gusting to 22 mph, in the morning, becoming south-southeast in the afternoon. |
| Thursday night |
Partly cloudy. Low 75°. Wind east-southeast around 6 mph, gusting to 17 mph, in the evening, becoming south-southwest after midnight. |
| Friday |
Partly to mostly sunny. Very hot. High 97°. Heat index up to 107°. UV index up to 7. Wind east around 5 mph, gusting to 23 mph, in the morning, becoming southeast in the afternoon. |
| Friday night |
Clear. Low 72°. Wind east around 5 mph, gusting to 18 mph, in the evening, becoming south after midnight. |
| Saturday |
Sunny. Very hot. High 101°. Heat index up to 109°. UV index up to 8. Wind southwest around 6 mph, gusting to 23 mph. |
| Saturday night |
Clear in the evening, becoming mostly clear after midnight. Low 72°. Wind south-southwest around 3 mph. |
| Sunday |
Partly cloudy in the morning, becoming sunny in the afternoon. Very hot. High 98°. Heat index up to 105°. UV index up to 8. Wind west-northwest around 3 mph, gusting to 21 mph. |
| Sunday night |
Fair to partly cloudy in the evening, becoming mostly cloudy to cloudy after midnight. A slight chance of rain in the evening, then a chance of rain after midnight. Scattered thundershowers possible. Low 72°. Wind east-northeast around 5 mph in the evening, becoming 9 mph after midnight. Chance of precipitation 40 percent. Precipitation mostly around a tenth of an inch. |
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