| WXSIM Forecast for:
O'Fallon Issued by: OFallonweather.com |
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| Updated: Monday, 15-Jun-2026 05:00 am | ||||||||||||||||||||||||||||||||||||||||||||||||
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| Today |
Mostly sunny. High 80°. UV index up to 8. Wind west-northwest around 4 mph, gusting to 23 mph. |
| Tonight |
Fair in the evening, becoming partly cloudy after midnight. Unusually cool. Low 57°. Wind south-southwest around 5 mph, gusting to 17 mph. |
| Tuesday |
Partly to mostly cloudy. A chance of rain. Precipitation showery or intermittent. High 82°. UV index up to 8. Wind south-southwest around 9 mph, gusting to 28 mph. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch. |
| Tuesday night |
Fair to partly cloudy in the evening, becoming clear after midnight. Light to moderate fog after midnight. Relatively cool. Low 61°. Wind west-southwest around 5 mph, gusting to 24 mph, in the evening, becoming southeast after midnight. |
| Wednesday |
Mostly sunny. Patchy light fog in the morning. Breezy and hot. High 90°. UV index up to 10. Wind south around 10 mph, gusting to 29 mph, in the morning, becoming 17 mph, gusting to 33 mph, in the afternoon. |
| Wednesday 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 thundershowers possible. Breezy. Low 70°. Wind southwest around 16 mph, gusting to 30 mph, in the evening, becoming 11 mph, gusting to 20 mph, after midnight. Chance of precipitation 60 percent. Precipitation mostly around a quarter of an inch. |
| Thursday |
Mostly sunny in the morning, becoming partly to mostly cloudy in the afternoon. Light to moderate fog in the morning. A chance of rain. High 84°. UV index up to 8. Wind northwest around 7 mph, gusting to 27 mph. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch. |
| Thursday night |
Fair to partly cloudy in the evening, becoming clear after midnight. Moderate fog after midnight. Relatively cool. Low 63°. Wind northwest around 3 mph, gusting to 22 mph. |
| Friday |
Sunny. Moderate fog in the morning. High 81°. UV index up to 10. Wind north-northwest around 7 mph, gusting to 26 mph. |
| Friday night |
Clear in the evening, becoming fair to partly cloudy after midnight. Relatively cool. Low 61°. Wind northeast around 3 mph, gusting to 21 mph, in the evening, becoming south after midnight. |
| Saturday |
Partly to mostly sunny in the morning, becoming partly cloudy in the afternoon. Hot. High 88°. UV index up to 8. Wind south around 6 mph, gusting to 25 mph. |
| Saturday night |
Mostly cloudy to cloudy in the evening, becoming dense overcast after midnight. Light to moderate fog after midnight. A chance of rain in the evening, then rain likely after midnight. Precipitation showery or intermittent. Low 67°. Wind southeast around 5 mph, gusting to 19 mph. Chance of precipitation 80 percent. Precipitation mostly between half an inch and one inch. |
| Sunday |
Cloudy in the morning, becoming mostly cloudy to cloudy in the afternoon. Light to moderate fog in the morning. A chance of rain in the morning, then a slight chance of rain in the afternoon. Scattered thundershowers possible. High 80°. UV index up to 5. Wind southwest around 11 mph, gusting to 26 mph, in the morning, becoming northwest in the afternoon. Chance of precipitation 60 percent. Precipitation mostly around a quarter of an inch. |
| Sunday night |
Mostly cloudy in the evening, becoming dense overcast after midnight. A chance of rain. Low 67°. Wind northeast around 6 mph, gusting to 25 mph. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch. |
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