| WXSIM Forecast for:
O'Fallon Issued by: OFallonweather.com |
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| Updated: Monday, 08-Jun-2026 04:00 pm | ||||||||||||||||||||||||||||||||||||||||||||||||
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| Tonight |
Partly cloudy in the evening, becoming mostly cloudy to cloudy after midnight. Light to moderate fog. Rain likely. Scattered thunderstorms likely. Low 75°. Wind south-southwest around 4 mph, gusting to 22 mph. Chance of precipitation 70 percent. Precipitation mostly less than a quarter of an inch. |
| Tuesday |
Partly to mostly cloudy in the morning, becoming partly to mostly sunny in the afternoon. Light to moderate fog in the morning. A chance of rain. Thunderstorms very likely, some possibly severe. Hot. High 91°. Heat index up to 100°. UV index up to 10. Wind west-southwest around 6 mph, gusting to 25 mph. Chance of precipitation 50 percent. Precipitation mostly less than a tenth of an inch. |
| Tuesday night |
Mostly clear in the evening, becoming fair after midnight. Moderate fog. A chance of rain. Scattered thunderstorms likely. Low 75°. Wind southwest around 5 mph, gusting to 19 mph. Chance of precipitation 40 percent. Precipitation mostly less than a tenth of an inch. |
| Wednesday |
Sunny in the morning, becoming partly cloudy in the afternoon. Moderate fog in the morning. Rain likely in the afternoon. Thunderstorms very likely, some possibly severe. Very hot. High 94°. Heat index up to 104°. UV index up to 9. Wind south-southwest around 8 mph, gusting to 29 mph. Chance of precipitation 60 percent. Precipitation mostly less than a quarter of an inch. |
| Wednesday night |
Fair to partly cloudy in the evening, becoming partly cloudy after midnight. Light to moderate fog in the evening, then moderate fog after midnight. Scattered thunderstorms likely, some possibly severe. Low 75°. Wind south-southwest around 7 mph, gusting to 15 mph. Chance of precipitation 40 percent. Precipitation mostly less than a tenth of an inch. |
| Thursday |
Sunny in the morning, becoming mostly sunny in the afternoon. Moderate fog in the morning. Very hot. High 94°. Heat index up to 104°. UV index up to 10. Wind south-southwest around 8 mph, gusting to 26 mph, in the morning, becoming 11 mph, gusting to 27 mph, in the afternoon. |
| Thursday night |
Fair to partly cloudy in the evening, becoming partly to mostly cloudy after midnight. Moderate fog in the evening, then light to moderate fog after midnight. Rain likely in the evening, then a chance of rain after midnight. Scattered thunderstorms likely, some possibly severe. Low 73°. Wind south-southwest around 8 mph, gusting to 23 mph, in the evening, becoming west-northwest around 5 mph after midnight. Chance of precipitation 80 percent. Precipitation mostly around a quarter of an inch. |
| Friday |
Partly to mostly sunny. Patchy light fog in the morning. Hot. High 87°. Heat index up to 91°. UV index up to 7. Wind northwest around 5 mph, gusting to 24 mph. |
| Friday night |
Mostly clear. Patchy light fog after midnight. Low 67°. Wind west-southwest around 2 mph, gusting to 20 mph, in the evening, becoming south-southwest after midnight. |
| Saturday |
Partly to mostly sunny in the morning, becoming partly to mostly cloudy in the afternoon. Patchy light fog in the morning. Hot. High 89°. Heat index up to 95°. UV index up to 8. Wind south-southwest around 5 mph, gusting to 24 mph. |
| Saturday night |
Mostly cloudy to cloudy. Light to moderate fog after midnight. Rain likely. Thunderstorms very likely, some possibly severe. Low 72°. Wind south-southwest around 3 mph, gusting to 20 mph, in the evening, becoming east-southeast after midnight. Chance of precipitation 60 percent. Precipitation mostly around a tenth of an inch. |
| Sunday |
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 possibly severe. High 85°. UV index up to 10. Wind east-northeast around 6 mph, gusting to 26 mph, in the morning, becoming east-southeast in the afternoon. Chance of precipitation 40 percent. Precipitation mostly less than a tenth of an inch. |
| Sunday night |
Dense overcast. Patchy light fog after midnight. Rain. Thunderstorms very likely, some possibly severe. Low 67°. Wind east-southeast around 5 mph, gusting to 20 mph. Chance of precipitation near 100 percent. Precipitation mostly around an inch. |
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