| WXSIM Forecast for:
O'Fallon Issued by: OFallonweather.com |
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| Updated: Friday, 31-Jul-2026 05:00 am | ||||||||||||||||||||||||||||||||||||||||||||||||
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| Today |
Mostly cloudy to cloudy. Rain likely. Precipitation showery or intermittent. High 84°. UV index up to 5. Wind south around 7 mph, gusting to 23 mph, in the morning, becoming 10 mph, gusting to 25 mph, in the afternoon. Chance of precipitation 70 percent. Precipitation mostly between a quarter and half an inch. |
| Tonight |
Partly cloudy in the evening, becoming partly to mostly cloudy after midnight. Moderate fog. Rain likely in the evening, then a chance of rain after midnight. Precipitation showery or intermittent. Low 74°. Wind south around 8 mph, gusting to 24 mph, in the evening, becoming southwest after midnight. Chance of precipitation 70 percent. Precipitation mostly around half an inch. |
| Saturday |
Cloudy in the morning, becoming dense overcast in the afternoon. Patchy light fog in the morning. Rain likely. Scattered thundershowers possible. High 78°. Wind west around 11 mph, gusting to 27 mph. Chance of precipitation 70 percent. Precipitation mostly around a quarter of an inch. |
| Saturday night |
Cloudy in the evening, becoming mostly cloudy to cloudy after midnight. Patchy light fog. A chance of rain in the evening, then a slight chance of rain after midnight. Scattered thundershowers possible. Breezy. Low 69°. Wind north-northwest around 12 mph, gusting to 27 mph. Chance of precipitation 50 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. High 80°. UV index up to 6. Wind north-northwest around 11 mph, gusting to 27 mph. |
| Sunday night |
Mostly clear. Light to moderate fog after midnight. Relatively cool. Low 65°. Wind north-northwest around 5 mph, gusting to 24 mph. |
| Monday |
Sunny. Patchy light fog in the morning. High 85°. UV index up to 9. Wind north around 5 mph, gusting to 24 mph. |
| Monday night |
Clear. Patchy light fog after midnight. Relatively cool. Low 64°. Wind northeast around 3 mph, gusting to 19 mph. |
| Tuesday |
Sunny. Patchy light fog in the morning. High 85°. UV index up to 9. Wind east-northeast around 3 mph, gusting to 24 mph. |
| Tuesday night |
Clear. Patchy light fog after midnight. Relatively cool. Low 66°. Wind east-northeast around 3 mph, gusting to 19 mph, in the evening, becoming southeast after midnight. |
| Wednesday |
Sunny. Patchy light fog in the morning. High 89°. Heat index up to 93°. UV index up to 9. Wind south-southeast around 3 mph, gusting to 21 mph, in the morning, becoming east in the afternoon. |
| Wednesday night |
Clear in the evening, becoming mostly clear after midnight. Patchy light fog after midnight. Low 67°. Wind east-southeast around 5 mph, gusting to 19 mph. |
| Thursday |
Partly cloudy in the morning, becoming partly to mostly sunny in the afternoon. Patchy light fog in the morning. Very hot. High 97°. Heat index up to 103°. UV index up to 9. Wind southeast around 7 mph, gusting to 22 mph, in the morning, becoming south in the afternoon. |
| Thursday night |
Partly to mostly cloudy in the evening, becoming partly cloudy after midnight. Patchy light fog in the evening, then moderate fog after midnight. A chance of rain in the evening, then a slight chance of rain after midnight. Scattered thunderstorms likely. Low 74°. Wind east-southeast around 7 mph in the evening, becoming south after midnight. Chance of precipitation 50 percent. Precipitation mostly less than a quarter of an inch. |
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