| WXSIM Forecast for:
O'Fallon Issued by: OFallonweather.com |
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| Updated: Monday, 24-Aug-2026 05:00 am | ||||||||||||||||||||||||||||||||||||||||||||||||
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| Today |
Partly cloudy. A chance of rain. High 82°. UV index up to 7. Wind east around 3 mph, gusting to 21 mph. Chance of precipitation 40 percent. Precipitation mostly around a tenth of an inch. |
| Tonight |
Fair in the evening, becoming fair to partly cloudy after midnight. Light to moderate fog after midnight. A chance of rain. Relatively cool. Low 60°. Wind east-northeast around 4 mph. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch. |
| Tuesday |
Partly to mostly sunny in the morning, becoming partly to mostly cloudy in the afternoon. Moderate fog in the morning. A chance of rain. High 83°. UV index up to 7. Wind east-southeast around 5 mph, gusting to 21 mph. Chance of precipitation 40 percent. Precipitation mostly less than a tenth of an inch. |
| Tuesday night |
Partly cloudy in the evening, becoming partly to mostly cloudy after midnight. Patchy light fog after midnight. A chance of rain. Precipitation showery or intermittent. Low 66°. Wind southeast around 4 mph. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch. |
| Wednesday |
Partly cloudy in the morning, becoming sunny in the afternoon. Patchy light fog in the morning. Hot. High 88°. Heat index up to 92°. UV index up to 7. Wind south-southwest around 5 mph, gusting to 22 mph, in the morning, becoming west in the afternoon. |
| Wednesday night |
Mostly clear. Patchy light fog after midnight. Low 65°. Wind north around 4 mph, gusting to 15 mph. |
| Thursday |
Sunny in the morning, becoming partly to mostly sunny in the afternoon. Patchy light fog in the morning. High 85°. UV index up to 7. Wind northwest around 5 mph, gusting to 22 mph. |
| Thursday night |
Fair in the evening, becoming clear after midnight. Patchy light fog after midnight. Relatively cool. Low 61°. Wind north around 3 mph, gusting to 18 mph. |
| Friday |
Sunny. Patchy light fog in the morning. High 86°. UV index up to 7. Wind northeast around 4 mph, gusting to 21 mph. |
| Friday night |
Fair to partly cloudy in the evening, becoming partly cloudy after midnight. Low 62°. Wind northeast around 3 mph, gusting to 15 mph, in the evening, becoming east-southeast after midnight. |
| Saturday |
Partly to mostly cloudy in the morning, becoming partly cloudy in the afternoon. Hot. High 89°. UV index up to 6. Wind south-southeast around 4 mph, gusting to 20 mph. |
| Saturday night |
Partly cloudy in the evening, becoming mostly cloudy to cloudy after midnight. A chance of rain. Low 69°. Wind south-southeast around 6 mph in the evening, becoming southwest after midnight. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch. |
| Sunday |
Mostly cloudy in the morning, becoming mostly sunny in the afternoon. A chance of rain in the morning, then a slight chance of rain in the afternoon. Scattered thundershowers possible. Very hot. High 97°. Heat index up to 104°. UV index up to 8. Wind southwest around 8 mph, gusting to 18 mph, in the morning, becoming 12 mph, gusting to 25 mph, in the afternoon. Chance of precipitation 40 percent. Precipitation mostly around a tenth of an inch. |
| Sunday night |
Mostly cloudy in the evening, becoming mostly cloudy to cloudy after midnight. Light to moderate fog after midnight. A slight chance of rain in the evening, then a chance of rain after midnight. Scattered thundershowers possible. Low 72°. Wind south around 9 mph, gusting to 20 mph, in the evening, becoming 5 mph after midnight. Chance of precipitation 40 percent. Precipitation mostly around a tenth of an inch. |
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