| WXSIM Forecast for:
O'Fallon Issued by: OFallonweather.com |
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| Updated: Thursday, 10-Sep-2026 04:00 pm | ||||||||||||||||||||||||||||||||||||||||||||||||
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| Tonight |
Mostly cloudy to cloudy. Warm. Low 71°. Wind north-northeast around 2 mph, gusting to 17 mph. |
| Friday |
Cloudy in the morning, becoming mostly cloudy in the afternoon. A slight chance of rain in the morning, then a chance of rain in the afternoon. Warm. High 82°. Wind east-northeast around 3 mph, gusting to 21 mph, in the morning, becoming southeast in the afternoon. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch. |
| Friday night |
Mostly clear in the evening, becoming fair to partly cloudy after midnight. Patchy light fog. Low 67°. Wind south-southeast around 3 mph, gusting to 16 mph. |
| Saturday |
Sunny. Patchy light fog in the morning. Unusually hot. High 90°. Heat index up to 96°. UV index up to 7. Wind west-southwest around 4 mph, gusting to 22 mph. |
| Saturday night |
Fair to partly cloudy in the evening, becoming partly to mostly cloudy after midnight. Low 68°. Wind west-southwest near calm in the evening, becoming west-northwest after midnight. |
| Sunday |
Partly to mostly sunny in the morning, becoming sunny in the afternoon. Very hot. High 91°. Heat index up to 96°. UV index up to 7. Wind east-northeast around 3 mph, gusting to 20 mph, in the morning, becoming south in the afternoon. |
| Sunday night |
Mostly clear in the evening, becoming fair to partly cloudy after midnight. Low 67°. Wind east-southeast around 5 mph, gusting to 16 mph. |
| Monday |
Mostly sunny in the morning, becoming partly to mostly sunny in the afternoon. Very hot. High 94°. Heat index up to 100°. UV index up to 7. Wind south-southeast around 6 mph, gusting to 23 mph. |
| Monday night |
Clear in the evening, becoming mostly clear after midnight. Warm. Low 70°. Wind south-southeast around 8 mph, gusting to 17 mph. |
| Tuesday |
Partly to mostly sunny 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. Very hot. High 97°. Heat index up to 106°. UV index up to 6. Wind south-southwest around 5 mph, gusting to 22 mph. Chance of precipitation 50 percent. Precipitation mostly around a tenth of an inch. |
| Tuesday night |
Partly to mostly cloudy in the evening, becoming partly cloudy after midnight. Patchy light fog. A chance of rain in the evening, then a slight chance of rain after midnight. Precipitation showery or intermittent. Warm. Low 73°. Wind northeast around 2 mph in the evening, becoming east after midnight. Chance of precipitation 50 percent. Precipitation mostly less than a tenth of an inch. |
| Wednesday |
Partly to mostly cloudy in the morning, becoming partly to mostly sunny in the afternoon. Light to moderate fog in the morning. Rain likely. Precipitation showery or intermittent. Hot. High 86°. Heat index up to 92°. UV index up to 6. Wind northeast around 5 mph, gusting to 24 mph. Chance of precipitation 60 percent. Precipitation mostly less than a quarter of an inch. |
| Wednesday night |
Cloudy in the evening, becoming dense overcast after midnight. Patchy light fog. Rain likely. Precipitation showery or intermittent. Low 69°. Wind northeast around 7 mph, gusting to 21 mph. Chance of precipitation 60 percent. Precipitation mostly around a quarter of an inch. |
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