| WXSIM Forecast for:
O'Fallon Issued by: OFallonweather.com |
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| Updated: Wednesday, 24-Jun-2026 05:00 am | ||||||||||||||||||||||||||||||||||||||||||||||||
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| Today |
Partly cloudy. A chance of rain. High 86°. UV index up to 8. Wind south around 6 mph, gusting to 26 mph, in the morning, becoming west-southwest in the afternoon. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch. |
| Tonight |
Fair to partly cloudy in the evening, becoming partly cloudy after midnight. Light to moderate fog after midnight. A chance of rain. Relatively cool. Low 65°. Wind west around 3 mph, gusting to 19 mph. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch. |
| Thursday |
Mostly cloudy in the morning, becoming cloudy in the afternoon. Patchy light fog in the morning. Rain likely. Precipitation showery or intermittent. High 79°. UV index up to 5. Wind southwest around 4 mph, gusting to 17 mph. Chance of precipitation 60 percent. Precipitation mostly around a quarter of an inch. |
| Thursday night |
Cloudy in the evening, becoming dense overcast after midnight. Patchy light fog in the evening, then light to moderate fog after midnight. Rain very likely. Precipitation showery or intermittent. Low 70°. Wind east around 3 mph in the evening, becoming southeast after midnight. Chance of precipitation 80 percent. Precipitation mostly between half an inch and one inch. |
| Friday |
Cloudy in the morning, becoming mostly cloudy in the afternoon. Moderate fog. Rain likely. Precipitation showery or intermittent. Relatively cool. High 75°. UV index up to 5. Wind south-southeast around 5 mph, gusting to 16 mph. Chance of precipitation 80 percent. Precipitation mostly between half an inch and one inch. |
| Friday night |
Mostly cloudy in the evening, becoming cloudy after midnight. Moderate fog in the evening, then patchy light fog after midnight. A chance of rain. Precipitation showery or intermittent. Low 72°. Wind south around 4 mph. Chance of precipitation 50 percent. Precipitation mostly less than a quarter of an inch. |
| Saturday |
Mostly cloudy to cloudy in the morning, becoming partly to mostly cloudy in the afternoon. Light to moderate fog in the morning. A chance of rain. High 85°. Heat index up to 92°. UV index up to 6. Wind southwest around 5 mph, gusting to 20 mph. Chance of precipitation 50 percent. Precipitation mostly around a tenth of an inch. |
| Saturday night |
Fair to partly cloudy in the evening, becoming fair after midnight. Moderate fog in the evening, then moderate to dense fog after midnight. Low 72°. Wind south-southeast around 5 mph, gusting to 18 mph. |
| Sunday |
Sunny. Moderate fog in the morning. Hot. High 91°. Heat index up to 100°. UV index up to 9. Wind south-southeast around 7 mph, gusting to 23 mph. |
| Sunday night |
Clear in the evening, becoming mostly clear after midnight. Patchy light fog in the evening, then moderate fog after midnight. Low 72°. Wind south-southeast around 5 mph, gusting to 18 mph. |
| Monday |
Sunny. Moderate fog in the morning. Hot. High 94°. Heat index up to 106°. UV index up to 9. Wind south-southwest around 6 mph, gusting to 23 mph. |
| Monday night |
Clear. Patchy light fog in the evening, then light to moderate fog after midnight. Low 75°. Wind south around 4 mph, gusting to 17 mph. |
| Tuesday |
Sunny. Light to moderate fog in the morning. Hot. High 94°. Heat index up to 107°. UV index up to 10. Wind south around 4 mph, gusting to 17 mph, in the morning, becoming southeast in the afternoon. |
| Tuesday night |
Mostly clear in the evening, becoming partly cloudy after midnight. Patchy light fog in the evening, then light to moderate fog after midnight. Low 75°. Wind south-southeast around 5 mph. |
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