| WXSIM Forecast for:
O'Fallon Issued by: OFallonweather.com |
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| Updated: Thursday, 11-Jun-2026 05:00 am | ||||||||||||||||||||||||||||||||||||||||||||||||
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| Today |
Partly to mostly sunny in the morning, becoming mostly sunny 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 hot. High 93°. Heat index up to 100°. UV index up to 9. Wind south around 9 mph, gusting to 29 mph, in the morning, becoming 15 mph, gusting to 31 mph, in the afternoon. Chance of precipitation 40 percent. Precipitation mostly less than a tenth of an inch. |
| Tonight |
Partly cloudy in the evening, becoming clear after midnight. Patchy light fog. A chance of rain in the evening, then a slight chance of rain after midnight. Thunderstorms very likely, some possibly severe. Low 68°. Wind west around 10 mph, gusting to 24 mph, in the evening, becoming 4 mph, gusting to 16 mph, after midnight. Chance of precipitation 50 percent. Precipitation mostly less than a quarter of an inch. |
| Friday |
Sunny. Patchy light fog in the morning. High 85°. UV index up to 10. Wind west-northwest around 5 mph, gusting to 24 mph. |
| Friday night |
Mostly clear in the evening, becoming partly cloudy after midnight. Patchy light fog after midnight. Low 66°. Wind east around 3 mph, gusting to 19 mph, in the evening, becoming south-southeast after midnight. |
| Saturday |
Mostly cloudy to cloudy in the morning, becoming partly to mostly cloudy in the afternoon. Patchy light fog in the morning. A chance of rain. Thunderstorms very likely, some severe. High 85°. UV index up to 6. Wind south around 8 mph, gusting to 25 mph. Chance of precipitation 50 percent. Precipitation mostly around a tenth of an inch. |
| Saturday night |
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. Thunderstorms very likely, some severe. Low 70°. Wind south-southwest around 7 mph, gusting to 24 mph, in the evening, becoming west-northwest after midnight. Chance of precipitation 50 percent. Precipitation mostly less than a tenth of an inch. |
| Sunday |
Partly to mostly sunny. High 78°. UV index up to 9. Wind northwest around 10 mph, gusting to 28 mph. |
| Sunday night |
Fair to partly cloudy in the evening, becoming partly cloudy after midnight. Relatively cool. Low 61°. Wind northwest around 4 mph, gusting to 25 mph. |
| Monday |
Sunny in the morning, becoming partly to mostly sunny in the afternoon. High 82°. UV index up to 8. Wind west-northwest around 6 mph, gusting to 25 mph. |
| Monday night |
Partly cloudy in the evening, becoming fair after midnight. Relatively cool. Low 60°. Wind west-northwest around 4 mph, gusting to 21 mph. |
| Tuesday |
Partly cloudy in the morning, becoming partly to mostly sunny in the afternoon. High 85°. UV index up to 8. Wind southwest around 4 mph, gusting to 24 mph, in the morning, becoming 8 mph, gusting to 25 mph, in the afternoon. |
| Tuesday night |
Partly cloudy in the evening, becoming fair after midnight. Relatively cool. Low 62°. Wind southwest around 5 mph, gusting to 23 mph. |
| Wednesday |
Sunny. Hot. High 87°. UV index up to 10. Wind southwest around 6 mph, gusting to 27 mph, in the morning, becoming 10 mph, gusting to 27 mph, in the afternoon. |
| Wednesday night |
Clear. Breezy. Low 64°. Wind south-southwest around 10 mph, gusting to 25 mph, in the evening, becoming 13 mph, gusting to 22 mph, after midnight. |
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