| WXSIM Forecast for:
O'Fallon Issued by: OFallonweather.com |
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| Updated: Monday, 22-Jun-2026 05:00 am | ||||||||||||||||||||||||||||||||||||||||||||||||
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| Today |
Mostly cloudy to cloudy in the morning, becoming mostly cloudy in the afternoon. High 78°. UV index up to 6. Wind north-northeast around 7 mph, gusting to 26 mph. |
| Tonight |
Mostly cloudy in the evening, becoming mostly clear after midnight. Unusually cool. Low 57°. Wind north-northeast around 5 mph, gusting to 24 mph, in the evening, becoming 2 mph after midnight. |
| Tuesday |
Sunny. High 81°. UV index up to 9. Wind east-northeast around 5 mph, gusting to 24 mph. |
| Tuesday night |
Fair in the evening, becoming mostly cloudy to cloudy after midnight. Relatively cool. Low 62°. Wind east around 4 mph, gusting to 21 mph. |
| Wednesday |
Cloudy in the morning, becoming mostly cloudy to cloudy in the afternoon. A chance of rain. Scattered thunderstorms likely. High 77°. UV index up to 5. Wind south-southwest around 6 mph, gusting to 22 mph. Chance of precipitation 50 percent. Precipitation mostly less than a quarter of an inch. |
| Wednesday night |
Partly cloudy. Patchy light fog. A chance of rain. Scattered thundershowers possible. Relatively cool. Low 66°. Wind west around 3 mph, gusting to 15 mph. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch. |
| Thursday |
Partly to mostly cloudy in the morning, becoming partly cloudy in the afternoon. A chance of rain. Scattered thundershowers possible. High 86°. UV index up to 9. Wind north around 4 mph, gusting to 22 mph. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch. |
| Thursday night |
Mostly cloudy to cloudy in the evening, becoming cloudy after midnight. Light to moderate fog. Rain likely. Scattered thunderstorms likely. Low 68°. Wind east-northeast around 4 mph, gusting to 19 mph, in the evening, becoming east-southeast after midnight. Chance of precipitation 80 percent. Precipitation mostly around an inch. |
| Friday |
Mostly cloudy to cloudy in the morning, becoming cloudy in the afternoon. Moderate fog in the morning, then light to moderate fog in the afternoon. Rain likely. Scattered thundershowers possible. Relatively cool. High 74°. UV index up to 5. Wind south-southeast around 5 mph. Chance of precipitation 80 percent. Precipitation mostly between 1 and 2 inches. |
| Friday night |
Cloudy in the evening, becoming mostly cloudy to cloudy after midnight. Light to moderate fog. Rain likely in the evening, then a chance of rain after midnight. Thunderstorms very likely, some possibly severe. Low 71°. Wind south-southeast around 4 mph in the evening, becoming south-southwest after midnight. Chance of precipitation 80 percent. Precipitation mostly between half an inch and one inch. |
| Saturday |
Partly cloudy in the morning, becoming partly to mostly cloudy in the afternoon. Light to moderate fog in the morning. A chance of rain. Scattered thunderstorms likely, some possibly severe. High 88°. Heat index up to 94°. UV index up to 7. Wind west-southwest around 4 mph, gusting to 21 mph. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch. |
| Saturday night |
Partly cloudy in the evening, becoming mostly clear after midnight. Light to moderate fog in the evening, then moderate fog after midnight. Low 71°. Wind south-southwest around 7 mph, gusting to 16 mph. |
| Sunday |
Partly cloudy in the morning, becoming sunny in the afternoon. Moderate fog in the morning. Hot. High 92°. Heat index up to 101°. UV index up to 10. Wind south-southwest around 11 mph, gusting to 25 mph. |
| Sunday night |
Clear. Moderate fog after midnight. Low 72°. Wind south-southwest around 7 mph, gusting to 20 mph. |
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