| WXSIM Forecast for:
O'Fallon Issued by: OFallonweather.com |
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| Updated: Wednesday, 10-Jun-2026 04:00 pm | ||||||||||||||||||||||||||||||||||||||||||||||||
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| Tonight |
Partly cloudy. Moderate fog. A chance of rain in the evening, then a slight chance of rain after midnight. Scattered thunderstorms likely, some possibly severe. Low 75°. Wind south-southwest around 7 mph, gusting to 22 mph. Chance of precipitation 40 percent. Precipitation mostly around a tenth of an inch. |
| Thursday |
Partly to mostly sunny in the morning, becoming partly cloudy in the afternoon. Moderate fog in the morning. A slight chance of rain in the afternoon. Scattered thundershowers possible. Hot. High 90°. Heat index up to 98°. UV index up to 9. Wind south-southwest around 9 mph, gusting to 27 mph, in the morning, becoming 13 mph, gusting to 28 mph, in the afternoon. Chance of precipitation 20 percent. Precipitation mostly less than a tenth of an inch. |
| Thursday night |
Partly cloudy. Patchy light fog. A chance of rain. Low 68°. Wind west-southwest around 11 mph, gusting to 24 mph, in the evening, becoming northwest around 7 mph, gusting to 17 mph, after midnight. Chance of precipitation 40 percent. Precipitation mostly around a tenth of an inch. |
| Friday |
Sunny. High 85°. UV index up to 9. Wind northwest around 4 mph, gusting to 22 mph. |
| Friday night |
Clear in the evening, becoming fair to partly cloudy after midnight. Patchy light fog after midnight. Low 65°. Wind south around 3 mph, gusting to 17 mph. |
| Saturday |
Partly to mostly cloudy. Patchy light fog in the morning. A chance of rain. Scattered thundershowers possible. High 86°. UV index up to 9. Wind south around 8 mph, gusting to 26 mph. Chance of precipitation 40 percent. Precipitation mostly around a tenth of an inch. |
| Saturday night |
Mostly cloudy in the evening, becoming cloudy after midnight. Patchy light fog in the evening, then light to moderate fog after midnight. A chance of rain in the evening, then rain likely after midnight. Scattered thunderstorms likely. Low 70°. Wind south around 5 mph, gusting to 22 mph, in the evening, becoming west-northwest after midnight. Chance of precipitation 70 percent. Precipitation mostly between half an inch and one inch. |
| Sunday |
Partly to mostly cloudy in the morning, becoming partly cloudy in the afternoon. Light to moderate fog in the morning. A chance of rain. Precipitation showery or intermittent. High 79°. UV index up to 8. Wind northwest around 9 mph, gusting to 26 mph. Chance of precipitation 40 percent. Precipitation mostly less than a quarter of an inch. |
| Sunday night |
Partly cloudy in the evening, becoming fair to partly cloudy after midnight. Relatively cool. Low 62°. Wind north-northwest around 3 mph, gusting to 22 mph, in the evening, becoming west-northwest after midnight. |
| Monday |
Partly cloudy. High 81°. UV index up to 8. Wind west around 4 mph, gusting to 23 mph. |
| Monday night |
Partly cloudy. Relatively cool. Low 61°. Wind southwest around 4 mph, gusting to 18 mph, in the evening, becoming west after midnight. |
| Tuesday |
Sunny in the morning, becoming partly to mostly cloudy in the afternoon. High 82°. UV index up to 10. Wind west around 5 mph, gusting to 24 mph. |
| Tuesday night |
Fair in the evening, becoming clear after midnight. Patchy light fog after midnight. Relatively cool. Low 61°. Wind west around 4 mph, gusting to 20 mph. |
WXSIM forecast formatting script by Saratoga-Weather.org.
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