| WXSIM Forecast for:
O'Fallon Issued by: OFallonweather.com |
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| Updated: Tuesday, 28-Jul-2026 05:00 am | ||||||||||||||||||||||||||||||||||||||||||||||||
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| Today |
Partly cloudy. A chance of rain. Hot. High 96°. Heat index up to 107°. UV index up to 9. Wind north-northwest around 5 mph, gusting to 25 mph. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch. |
| Tonight |
Partly cloudy in the evening, becoming fair to partly cloudy after midnight. Patchy light fog in the evening, then moderate fog after midnight. A chance of rain. Low 73°. Wind northeast around 5 mph, gusting to 20 mph. Chance of precipitation 40 percent. Precipitation mostly less than a tenth of an inch. |
| Wednesday |
Mostly sunny. Light to moderate fog in the morning. High 90°. Heat index up to 96°. UV index up to 9. Wind east around 6 mph, gusting to 25 mph. |
| Wednesday night |
Fair in the evening, becoming clear after midnight. Patchy light fog after midnight. Low 68°. Wind east around 4 mph, gusting to 23 mph. |
| Thursday |
Sunny in the morning, becoming mostly sunny in the afternoon. Patchy light fog in the morning. Hot. High 91°. Heat index up to 95°. UV index up to 8. Wind southeast around 5 mph, gusting to 25 mph. |
| Thursday night |
Fair to partly cloudy in the evening, becoming partly cloudy after midnight. Low 68°. Wind southeast around 6 mph, gusting to 23 mph. |
| Friday |
Partly to mostly cloudy. A slight chance of rain. Precipitation showery or intermittent. Hot. High 92°. UV index up to 9. Wind south-southeast around 8 mph, gusting to 27 mph. Chance of precipitation 20 percent. Precipitation mostly less than a tenth of an inch. |
| Friday night |
Partly to mostly cloudy in the evening, becoming mostly cloudy to cloudy after midnight. A chance of rain in the evening, then a slight chance of rain after midnight. Precipitation showery or intermittent. Low 73°. Wind south around 7 mph, gusting to 21 mph, in the evening, becoming west after midnight. Chance of precipitation 40 percent. Precipitation mostly less than a tenth of an inch. |
| Saturday |
Cloudy. Rain likely. Precipitation showery or intermittent. High 79°. UV index up to 4. Wind west-northwest around 11 mph, gusting to 29 mph. Chance of precipitation 60 percent. Precipitation mostly less than a quarter of an inch. |
| Saturday night |
Mostly cloudy to cloudy in the evening, becoming partly to mostly cloudy after midnight. Patchy light fog after midnight. A chance of rain in the evening, then a slight chance of rain after midnight. Precipitation showery or intermittent. Low 68°. Wind north-northwest around 11 mph, gusting to 27 mph. Chance of precipitation 40 percent. Precipitation mostly less than a tenth of an inch. |
| Sunday |
Mostly cloudy in the morning, becoming mostly cloudy to cloudy in the afternoon. Patchy light fog in the morning. A chance of rain. Precipitation showery or intermittent. Breezy and relatively cool. High 77°. UV index up to 4. Wind north-northwest around 11 mph, gusting to 27 mph. Chance of precipitation 50 percent. Precipitation mostly around a tenth of an inch. |
| Sunday night |
Fair to partly cloudy in the evening, becoming partly cloudy after midnight. Light to moderate fog in the evening, then moderate fog after midnight. A slight chance of rain. Relatively cool. Low 66°. Wind north-northwest around 8 mph, gusting to 23 mph, in the evening, becoming northeast around 4 mph after midnight. Chance of precipitation 20 percent. Precipitation mostly less than a tenth of an inch. |
| Monday |
Partly cloudy. Patchy light fog in the morning. A slight chance of rain in the morning, then a chance of rain in the afternoon. Precipitation showery or intermittent. High 84°. UV index up to 8. Wind northeast around 5 mph, gusting to 24 mph, in the morning, becoming east in the afternoon. Chance of precipitation 40 percent. Precipitation mostly around a tenth of an inch. |
| Monday night |
Mostly clear in the evening, becoming clear after midnight. Patchy light fog in the evening, then light to moderate fog after midnight. Low 68°. Wind east around 3 mph, gusting to 19 mph. |
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