| WXSIM Forecast for:
O'Fallon Issued by: OFallonweather.com |
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| Updated: Friday, 12-Jun-2026 04:00 pm | ||||||||||||||||||||||||||||||||||||||||||||||||
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| Tonight |
Clear in the evening, becoming partly cloudy after midnight. Patchy light fog after midnight. Low 65°. Wind south-southwest around 3 mph, gusting to 20 mph, in the evening, becoming south-southeast after midnight. |
| Saturday |
Mostly cloudy to cloudy. A chance of rain. Scattered thunderstorms likely, some possibly severe. High 86°. UV index up to 5. Wind south-southeast around 7 mph, gusting to 24 mph, in the morning, becoming southwest in the afternoon. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch. |
| Saturday night |
Mostly cloudy in the evening, becoming cloudy after midnight. Light to moderate fog after midnight. A chance of rain in the evening, then rain likely after midnight. Thunderstorms very likely, some severe. Low 70°. Wind southwest around 5 mph, gusting to 22 mph. Chance of precipitation 70 percent. Precipitation mostly between a quarter and half an inch. |
| Sunday |
Partly to mostly cloudy in the morning, becoming mostly sunny in the afternoon. Patchy light fog in the morning. A chance of rain. Scattered thunderstorms likely, some possibly severe. High 79°. UV index up to 9. Wind north-northwest around 11 mph, gusting to 30 mph. Chance of precipitation 40 percent. Precipitation mostly less than a tenth of an inch. |
| Sunday night |
Partly to mostly cloudy. Relatively cool. Low 62°. Wind north-northwest around 6 mph, gusting to 26 mph, in the evening, becoming 3 mph, gusting to 17 mph, after midnight. |
| Monday |
Mostly sunny in the morning, becoming partly cloudy in the afternoon. High 80°. UV index up to 6. Wind west-northwest around 5 mph, gusting to 23 mph. |
| Monday night |
Fair to partly cloudy in the evening, becoming fair after midnight. Relatively cool. Low 59°. Wind west-southwest around 4 mph, gusting to 20 mph. |
| Tuesday |
Partly to mostly sunny in the morning, becoming partly to mostly cloudy in the afternoon. A slight chance of rain in the afternoon. Scattered thunderstorms likely. High 84°. UV index up to 6. Wind west-southwest around 9 mph, gusting to 27 mph. Chance of precipitation 20 percent. Precipitation mostly less than a tenth of an inch. |
| Tuesday night |
Partly cloudy in the evening, becoming fair after midnight. Patchy light fog after midnight. Relatively cool. Low 61°. Wind west-southwest around 5 mph, gusting to 22 mph. |
| Wednesday |
Partly to mostly sunny in the morning, becoming partly to mostly cloudy in the afternoon. Patchy light fog in the morning. A chance of rain. Scattered thunderstorms likely. Hot. High 89°. Heat index up to 93°. UV index up to 7. Wind south around 7 mph, gusting to 26 mph, in the morning, becoming 12 mph, gusting to 28 mph, in the afternoon. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch. |
| Wednesday night |
Partly cloudy. Moderate fog. Rain likely. Thunderstorms very likely, some severe. Low 72°. Wind south around 11 mph, gusting to 27 mph, in the evening, becoming west-southwest after midnight. Chance of precipitation 80 percent. Precipitation mostly around an inch. |
| Thursday |
Partly cloudy in the morning, becoming partly to mostly sunny in the afternoon. Patchy light fog in the morning. A slight chance of rain. Scattered thundershowers possible. High 84°. UV index up to 10. Wind northwest around 11 mph, gusting to 28 mph. Chance of precipitation 20 percent. Precipitation mostly less than a tenth of an inch. |
| Thursday night |
Clear. Patchy light fog after midnight. Low 64°. Wind northwest around 7 mph, gusting to 27 mph, in the evening, becoming 2 mph after midnight. |
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