| WXSIM Forecast for:
O'Fallon Issued by: OFallonweather.com |
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| Updated: Friday, 07-Aug-2026 05:00 am | ||||||||||||||||||||||||||||||||||||||||||||||||
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| Today |
Partly to mostly sunny in the morning, becoming partly cloudy in the afternoon. A chance of rain. High 87°. UV index up to 7. Wind southwest around 4 mph, gusting to 21 mph, in the morning, becoming west in the afternoon. Chance of precipitation 40 percent. Precipitation mostly around a tenth of an inch. |
| Tonight |
Fair to partly cloudy in the evening, becoming partly cloudy after midnight. Moderate fog after midnight. A chance of rain. Scattered thundershowers possible. Low 70°. Wind west-southwest around 5 mph. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch. |
| Saturday |
Partly to mostly sunny. Light to moderate fog in the morning. A chance of rain. High 88°. Heat index up to 93°. UV index up to 8. Wind west-northwest around 4 mph, gusting to 20 mph, in the morning, becoming east-northeast in the afternoon. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch. |
| Saturday night |
Fair. Patchy light fog after midnight. Low 70°. Wind southeast around 3 mph. |
| Sunday |
Sunny. Light to moderate fog in the morning. Hot. High 91°. Heat index up to 99°. UV index up to 8. Wind south-southeast around 7 mph, gusting to 22 mph, in the morning, becoming south-southwest in the afternoon. |
| Sunday night |
Mostly clear in the evening, becoming clear after midnight. Patchy light fog after midnight. Low 71°. Wind south-southwest around 7 mph, gusting to 15 mph. |
| Monday |
Mostly sunny in the morning, becoming sunny in the afternoon. Patchy light fog in the morning. Hot. High 92°. Heat index up to 101°. UV index up to 8. Wind south-southwest around 8 mph, gusting to 25 mph. |
| Monday night |
Fair to partly cloudy in the evening, becoming mostly clear after midnight. Low 73°. Wind south-southwest around 6 mph, gusting to 18 mph. |
| Tuesday |
Mostly sunny. Very hot. High 96°. Heat index up to 104°. UV index up to 8. Wind southwest around 7 mph, gusting to 24 mph. |
| Tuesday night |
Mostly clear. Patchy light fog after midnight. Low 73°. Wind south-southwest around 5 mph, gusting to 17 mph. |
| Wednesday |
Partly cloudy. A slight chance of rain. Scattered thunderstorms likely. Hot. High 95°. Heat index up to 102°. UV index up to 8. Wind west-southwest around 6 mph, gusting to 23 mph. Chance of precipitation 20 percent. Precipitation mostly less than a tenth of an inch. |
| Wednesday night |
Mostly cloudy in the evening, becoming fair to partly cloudy after midnight. Patchy light fog in the evening, then light to moderate fog after midnight. A chance of rain in the evening, then a slight chance of rain after midnight. Scattered thunderstorms likely. Low 71°. Wind northwest around 5 mph, gusting to 20 mph, in the evening, becoming north-northeast after midnight. Chance of precipitation 50 percent. Precipitation mostly less than a quarter of an inch. |
| Thursday |
Partly to mostly cloudy in the morning, becoming mostly cloudy to cloudy in the afternoon. Patchy light fog in the morning. High 87°. UV index up to 7. Wind northeast around 3 mph, gusting to 21 mph, in the morning, becoming east-southeast in the afternoon. |
| Thursday night |
Partly cloudy in the evening, becoming clear after midnight. Patchy light fog after midnight. Low 68°. Wind southeast around 3 mph, gusting to 19 mph. |
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