| WXSIM Forecast for:
O'Fallon Issued by: OFallonweather.com |
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| Updated: Wednesday, 17-Jun-2026 04:00 pm | ||||||||||||||||||||||||||||||||||||||||||||||||
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| Tonight |
Partly cloudy in the evening, becoming fair after midnight. Moderate fog in the evening, then moderate to dense fog after midnight. Rain likely in the evening, then a chance of rain after midnight. Precipitation showery or intermittent. Low 74°. Wind southwest around 11 mph, gusting to 27 mph, in the evening, becoming 8 mph, gusting to 18 mph, after midnight. Chance of precipitation 70 percent. Precipitation mostly less than a quarter of an inch. |
| Thursday |
Partly to mostly cloudy. Moderate fog in the morning. A slight chance of rain in the morning, then a chance of rain in the afternoon. High 87°. UV index up to 8. Wind west-northwest around 6 mph, gusting to 26 mph. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch. |
| Thursday night |
Partly to mostly cloudy in the evening, becoming partly cloudy after midnight. Patchy light fog after midnight. Low 68°. Wind west-northwest around 3 mph, gusting to 24 mph. |
| Friday |
Partly cloudy in the morning, becoming partly to mostly cloudy in the afternoon. Patchy light fog in the morning. High 86°. UV index up to 8. Wind north-northwest around 3 mph, gusting to 22 mph. |
| Friday night |
Fair to partly cloudy. Moderate fog after midnight. Low 67°. Wind east-southeast around 4 mph, gusting to 17 mph, in the evening, becoming south after midnight. |
| Saturday |
Partly cloudy. Moderate fog in the morning. A chance of rain in the afternoon. Precipitation showery or intermittent. High 88°. UV index up to 8. Wind west around 3 mph, gusting to 21 mph, in the morning, becoming east-southeast in the afternoon. Chance of precipitation 40 percent. Precipitation mostly less than a tenth of an inch. |
| Saturday night |
Partly cloudy in the evening, becoming cloudy after midnight. Light to moderate fog after midnight. Rain likely. Scattered thunderstorms likely. Low 70°. Wind east around 3 mph, gusting to 15 mph. Chance of precipitation 60 percent. Precipitation mostly around a tenth of an inch. |
| Sunday |
Cloudy. Light to moderate fog in the morning, then patchy light fog in the afternoon. Rain. Scattered thunderstorms likely. High 80°. UV index up to 5. Wind south-southeast around 10 mph, gusting to 25 mph, in the morning, becoming southwest in the afternoon. Chance of precipitation near 100 percent. Precipitation mostly between half an inch and one inch. |
| Sunday night |
Mostly cloudy in the evening, becoming fair to partly cloudy after midnight. Light to moderate fog. Rain likely in the evening, then a slight chance of rain after midnight. Scattered thundershowers possible. Relatively cool. Low 65°. Wind west-northwest around 10 mph, gusting to 24 mph, in the evening, becoming north-northwest after midnight. Chance of precipitation 80 percent. Precipitation mostly between a quarter and half an inch. |
| Monday |
Partly to mostly cloudy in the morning, becoming mostly cloudy in the afternoon. Light to moderate fog in the morning. High 80°. UV index up to 7. Wind north-northeast around 6 mph, gusting to 25 mph. |
| Monday night |
Mostly cloudy in the evening, becoming fair to partly cloudy after midnight. Relatively cool. Low 62°. Wind northeast around 4 mph, gusting to 22 mph. |
| Tuesday |
Partly to mostly cloudy in the morning, becoming mostly cloudy in the afternoon. High 83°. UV index up to 8. Wind east-southeast around 3 mph, gusting to 25 mph, in the morning, becoming north-northeast in the afternoon. |
| Tuesday night |
Partly cloudy in the evening, becoming mostly cloudy after midnight. Low 65°. Wind northwest around 2 mph, gusting to 18 mph, in the evening, becoming west after midnight. |
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