| WXSIM Forecast for:
O'Fallon Issued by: OFallonweather.com |
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| Updated: Saturday, 01-Aug-2026 05:00 am | ||||||||||||||||||||||||||||||||||||||||||||||||
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| Today |
Cloudy in the morning, becoming dense overcast in the afternoon. Rain likely. Precipitation showery or intermittent. Relatively cool. High 77°. Wind west around 9 mph, gusting to 26 mph, in the morning, becoming northwest in the afternoon. Chance of precipitation 60 percent. Precipitation mostly less than a quarter of an inch. |
| Tonight |
Dense overcast in the evening, becoming cloudy after midnight. Patchy light fog after midnight. Rain likely. Precipitation showery or intermittent. Low 68°. Wind northwest around 11 mph, gusting to 24 mph. Chance of precipitation 60 percent. Precipitation mostly less than a quarter of an inch. |
| Sunday |
Mostly cloudy to cloudy in the morning, becoming partly to mostly cloudy in the afternoon. Patchy light fog in the morning. A chance of rain. Breezy and relatively cool. High 77°. UV index up to 7. Wind north around 12 mph, gusting to 27 mph. Chance of precipitation 50 percent. Precipitation mostly less than a quarter of an inch. |
| Sunday night |
Fair to partly cloudy in the evening, becoming mostly clear after midnight. Light to moderate fog in the evening, then moderate fog after midnight. A chance of rain. Relatively cool. Low 64°. Wind north around 6 mph, gusting to 23 mph. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch. |
| Monday |
Sunny in the morning, becoming partly to mostly sunny in the afternoon. Light to moderate fog in the morning. High 84°. UV index up to 8. Wind north-northeast around 6 mph, gusting to 25 mph. |
| Monday night |
Clear. Patchy light fog after midnight. Relatively cool. Low 63°. Wind east-northeast around 3 mph, gusting to 18 mph. |
| Tuesday |
Sunny. Patchy light fog in the morning. High 85°. UV index up to 9. Wind east around 3 mph, gusting to 24 mph, in the morning, becoming northeast in the afternoon. |
| Tuesday night |
Clear in the evening, becoming mostly clear after midnight. Relatively cool. Low 65°. Wind east-northeast around 3 mph, gusting to 18 mph, in the evening, becoming southeast after midnight. |
| Wednesday |
Sunny in the morning, becoming mostly sunny in the afternoon. High 90°. Heat index up to 94°. UV index up to 8. Wind south-southeast around 3 mph, gusting to 22 mph. |
| Wednesday night |
Fair in the evening, becoming partly cloudy after midnight. Light to moderate fog after midnight. Low 69°. Wind east around 6 mph, gusting to 18 mph. |
| Thursday |
Partly to mostly cloudy in the morning, becoming partly 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 88°. Heat index up to 95°. UV index up to 7. Wind south around 6 mph, gusting to 17 mph. Chance of precipitation 50 percent. Precipitation mostly less than a quarter of an inch. |
| Thursday night |
Partly 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-southwest around 4 mph in the evening, becoming north after midnight. Chance of precipitation 60 percent. Precipitation mostly around a quarter of an inch. |
| Friday |
Mostly cloudy in the morning, becoming partly cloudy in the afternoon. Light to moderate fog in the morning. Hot. High 92°. Heat index up to 100°. UV index up to 9. Wind south-southeast around 5 mph, gusting to 20 mph. |
| Friday night |
Clear. Patchy light fog after midnight. Low 73°. Wind south-southeast around 8 mph, gusting to 17 mph. |
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