| WXSIM Forecast for:
O'Fallon Issued by: OFallonweather.com |
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| Updated: Wednesday, 10-Jun-2026 05:00 am | ||||||||||||||||||||||||||||||||||||||||||||||||
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| Today |
Partly cloudy. A chance of rain in the afternoon. Scattered thunderstorms likely, some possibly severe. Very hot. High 98°. Heat index up to 109°. UV index up to 8. Wind south-southwest around 9 mph, gusting to 30 mph. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch. |
| Tonight |
Partly cloudy in the evening, becoming partly to mostly cloudy after midnight. A chance of rain in the evening, then a slight chance of rain after midnight. Scattered thunderstorms likely, some possibly severe. Warm. Low 79°. Wind south-southwest around 7 mph, gusting to 24 mph. Chance of precipitation 40 percent. Precipitation mostly less than a tenth of an inch. |
| Thursday |
Mostly sunny in the morning, becoming partly to mostly sunny in the afternoon. A slight chance of rain in the morning, then a chance of rain in the afternoon. Scattered thundershowers possible. Very hot. High 98°. Heat index up to 113°. UV index up to 10. Wind south-southwest around 8 mph, gusting to 29 mph, in the morning, becoming 12 mph, gusting to 30 mph, in the afternoon. Chance of precipitation 40 percent. Precipitation mostly less than a tenth of an inch. |
| Thursday night |
Partly to mostly cloudy in the evening, becoming fair after midnight. Light to moderate fog in the evening, then moderate to dense fog after midnight. A chance of rain in the evening, then a slight chance of rain after midnight. Scattered thunderstorms likely. Low 73°. Wind west around 9 mph, gusting to 24 mph, in the evening, becoming 5 mph, gusting to 19 mph, after midnight. Chance of precipitation 60 percent. Precipitation mostly around a quarter of an inch. |
| Friday |
Sunny. Moderate fog in the morning. High 87°. Heat index up to 92°. UV index up to 9. Wind west-northwest around 5 mph, gusting to 25 mph. |
| Friday night |
Clear in the evening, becoming mostly clear after midnight. Moderate fog after midnight. Low 68°. Wind east around 3 mph, gusting to 20 mph, in the evening, becoming southeast after midnight. |
| Saturday |
Mostly cloudy. Light to moderate fog in the morning. A slight chance of rain in the morning, then a chance of rain in the afternoon. Scattered thunderstorms likely. High 87°. Heat index up to 93°. UV index up to 6. Wind south-southwest around 7 mph, gusting to 25 mph. Chance of precipitation 40 percent. Precipitation mostly less than a tenth of an inch. |
| Saturday night |
Partly to mostly cloudy in the evening, becoming cloudy after midnight. Patchy light fog after midnight. A slight chance of rain in the evening, then a chance of rain after midnight. Scattered thunderstorms likely. Low 72°. Wind south-southwest around 5 mph, gusting to 19 mph, in the evening, becoming west after midnight. Chance of precipitation 50 percent. Precipitation mostly around a tenth of an inch. |
| Sunday |
Mostly cloudy to cloudy in the morning, becoming partly cloudy in the afternoon. Light to moderate fog in the morning. A chance of rain. Scattered thundershowers possible. High 85°. UV index up to 8. Wind north around 8 mph, gusting to 28 mph. Chance of precipitation 40 percent. Precipitation mostly around a tenth of an inch. |
| Sunday night |
Partly cloudy in the evening, becoming mostly cloudy after midnight. Low 65°. Wind northeast around 5 mph, gusting to 26 mph. |
| Monday |
Cloudy in the morning, becoming dense overcast in the afternoon. Light to moderate fog in the morning, then patchy light fog in the afternoon. Rain likely in the morning, then a chance of rain in the afternoon. Cool. High 70°. UV index up to 4. Wind northeast around 6 mph, gusting to 24 mph. Chance of precipitation 70 percent. Precipitation mostly around half an inch. |
| Monday night |
Partly cloudy in the evening, becoming partly to mostly cloudy after midnight. Patchy light fog after midnight. Relatively cool. Low 61°. Wind north around 5 mph, gusting to 23 mph. |
| Tuesday |
Mostly cloudy to cloudy in the morning, becoming partly cloudy in the afternoon. A slight chance of rain in the morning, then a chance of rain in the afternoon. Precipitation showery or intermittent. High 78°. UV index up to 10. Wind west-northwest around 4 mph, gusting to 24 mph. Chance of precipitation 40 percent. Precipitation mostly around a tenth of an inch. |
| Tuesday night |
Mostly clear in the evening, becoming clear after midnight. Light to moderate fog after midnight. Relatively cool. Low 61°. Wind west-southwest around 4 mph, gusting to 18 mph. |
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