| WXSIM Forecast for:
O'Fallon Issued by: OFallonweather.com |
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| Updated: Friday, 10-Jul-2026 04:00 pm | ||||||||||||||||||||||||||||||||||||||||||||||||
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| Tonight |
Partly cloudy in the evening, becoming partly to mostly cloudy after midnight. Moderate fog. Rain very likely. Scattered thunderstorms likely. Low 74°. Wind north-northwest around 2 mph, gusting to 17 mph, in the evening, becoming south after midnight. Chance of precipitation 80 percent. Precipitation mostly between a quarter and half an inch. |
| Saturday |
Mostly cloudy to cloudy in the morning, becoming cloudy in the afternoon. Light to moderate fog. Rain. Scattered thunderstorms likely. High 80°. UV index up to 5. Wind east-southeast around 3 mph, gusting to 18 mph, in the morning, becoming north-northeast in the afternoon. Chance of precipitation near 100 percent. Precipitation mostly between half an inch and one inch. |
| Saturday night |
Mostly cloudy in the evening, becoming mostly cloudy to cloudy after midnight. Moderate fog in the evening, then light to moderate fog after midnight. Rain likely in the evening, then a chance of rain after midnight. Scattered thundershowers possible. Low 72°. Wind north-northeast around 5 mph, gusting to 17 mph. Chance of precipitation 70 percent. Precipitation mostly around a quarter of an inch. |
| Sunday |
Mostly cloudy in the morning, becoming partly to mostly sunny in the afternoon. Patchy light fog in the morning. Rain likely. High 84°. UV index up to 9. Wind north-northeast around 8 mph, gusting to 26 mph. Chance of precipitation 60 percent. Precipitation mostly less than a tenth of an inch. |
| Sunday night |
Clear. Patchy light fog in the evening, then light to moderate fog after midnight. Low 68°. Wind north-northeast around 6 mph, gusting to 24 mph. |
| Monday |
Sunny. Light to moderate fog in the morning. High 87°. UV index up to 9. Wind north-northeast around 7 mph, gusting to 25 mph. |
| Monday night |
Partly cloudy in the evening, becoming partly to mostly cloudy after midnight. Low 68°. Wind north-northeast around 5 mph, gusting to 23 mph. |
| Tuesday |
Partly to mostly cloudy in the morning, becoming partly to mostly sunny in the afternoon. A slight chance of rain in the morning, then a chance of rain in the afternoon. High 86°. UV index up to 9. Wind northeast around 6 mph, gusting to 24 mph. Chance of precipitation 50 percent. Precipitation mostly less than a tenth of an inch. |
| Tuesday night |
Fair. Patchy light fog in the evening, then light to moderate fog after midnight. Low 71°. Wind east-northeast around 4 mph, gusting to 20 mph. |
| Wednesday |
Partly cloudy in the morning, becoming partly to mostly cloudy in the afternoon. Light to moderate fog in the morning. A chance of rain. Precipitation showery or intermittent. High 87°. Heat index up to 94°. UV index up to 6. Wind east-southeast around 4 mph, gusting to 20 mph. Chance of precipitation 50 percent. Precipitation mostly less than a tenth of an inch. |
| Wednesday night |
Fair to partly cloudy in the evening, becoming partly to mostly cloudy after midnight. Patchy light fog. Low 73°. Wind southeast around 2 mph, gusting to 17 mph, in the evening, becoming south-southwest after midnight. |
| Thursday |
Partly cloudy. Patchy light fog in the morning. A chance of rain. High 90°. Heat index up to 98°. UV index up to 8. Wind west around 5 mph, gusting to 21 mph, in the morning, becoming 9 mph, gusting to 25 mph, in the afternoon. Chance of precipitation 40 percent. Precipitation mostly less than a tenth of an inch. |
| Thursday night |
Partly to mostly cloudy in the evening, becoming fair to partly cloudy after midnight. Patchy light fog after midnight. Low 72°. Wind west around 4 mph, gusting to 21 mph. |
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