| WXSIM Forecast for:
O'Fallon Issued by: OFallonweather.com |
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| Updated: Monday, 07-Sep-2026 05:00 am | ||||||||||||||||||||||||||||||||||||||||||||||||
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| Today |
Sunny. Hot. High 88°. UV index up to 8. Wind east-southeast around 6 mph, gusting to 25 mph. |
| Tonight |
Clear in the evening, becoming partly cloudy after midnight. Low 62°. Wind east-southeast around 4 mph, gusting to 18 mph. |
| Tuesday |
Partly cloudy in the morning, becoming partly to mostly sunny in the afternoon. Very hot. High 93°. UV index up to 8. Wind south-southeast around 4 mph, gusting to 22 mph. |
| Tuesday night |
Partly cloudy in the evening, becoming clear after midnight. Low 66°. Wind south-southeast around 5 mph, gusting to 15 mph. |
| Wednesday |
Sunny in the morning, becoming partly cloudy in the afternoon. A chance of rain in the afternoon. Scattered thundershowers possible. Extremely hot. High 98°. UV index up to 7. Wind west-southwest around 7 mph, gusting to 24 mph. Chance of precipitation 40 percent. Precipitation mostly less than a tenth of an inch. |
| Wednesday night |
Partly to 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. Scattered thundershowers possible. Low 70°. Wind southwest around 2 mph in the evening, becoming north-northwest after midnight. Chance of precipitation 70 percent. Precipitation mostly around half an inch. |
| Thursday |
Dense overcast in the morning, becoming mostly cloudy in the afternoon. Patchy light fog in the morning. A chance of rain in the morning, then a slight chance of rain in the afternoon. Scattered thundershowers possible. High 82°. UV index up to 5. Wind north-northwest around 3 mph, gusting to 18 mph. Chance of precipitation 50 percent. Precipitation mostly less than a tenth of an inch. |
| Thursday night |
Partly cloudy in the evening, becoming fair to partly cloudy after midnight. Patchy light fog after midnight. Low 65°. Wind north-northeast around 3 mph, gusting to 16 mph, in the evening, becoming east-northeast after midnight. |
| Friday |
Partly cloudy in the morning, becoming sunny in the afternoon. Patchy light fog in the morning. Hot. High 86°. UV index up to 6. Wind east-southeast around 5 mph, gusting to 22 mph, in the morning, becoming south-southeast in the afternoon. |
| Friday night |
Fair in the evening, becoming partly to mostly cloudy after midnight. Moderate fog after midnight. A slight chance of rain in the evening, then a chance of rain after midnight. Scattered thundershowers possible. Low 68°. Wind south-southeast around 4 mph. Chance of precipitation 60 percent. Precipitation mostly around a quarter of an inch. |
| Saturday |
Partly to mostly sunny. Moderate fog in the morning. A chance of rain in the morning, then a slight chance of rain in the afternoon. Hot. High 89°. Heat index up to 96°. UV index up to 6. Wind south-southwest around 5 mph, gusting to 23 mph. Chance of precipitation 50 percent. Precipitation mostly around a quarter of an inch. |
| Saturday night |
Partly cloudy. Light to moderate fog after midnight. Warm. Low 73°. Wind south-southeast around 4 mph. |
| Sunday |
Partly to mostly sunny in the morning, becoming sunny in the afternoon. Patchy light fog in the morning. Very hot. High 95°. Heat index up to 106°. UV index up to 7. Wind south around 7 mph, gusting to 22 mph, in the morning, becoming 12 mph, gusting to 24 mph, in the afternoon. |
| Sunday night |
Mostly clear in the evening, becoming clear after midnight. Patchy light fog after midnight. Warm. Low 73°. Wind south-southwest around 8 mph, gusting to 17 mph. |
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