| WXSIM Forecast for:
O'Fallon Issued by: OFallonweather.com |
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| Updated: Thursday, 30-Jul-2026 05:00 am | ||||||||||||||||||||||||||||||||||||||||||||||||
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| Today |
Partly to mostly sunny in the morning, becoming partly to mostly cloudy in the afternoon. Hot. High 90°. UV index up to 8. Wind east around 4 mph, gusting to 24 mph. |
| Tonight |
Partly cloudy. A chance of rain. Relatively cool. Low 66°. Wind east around 5 mph, gusting to 21 mph, in the evening, becoming southeast after midnight. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch. |
| Friday |
Cloudy in the morning, becoming mostly cloudy in the afternoon. A chance of rain. Scattered thundershowers possible. High 84°. UV index up to 5. Wind south around 7 mph, gusting to 22 mph. Chance of precipitation 50 percent. Precipitation mostly less than a quarter of an inch. |
| Friday night |
Fair to partly cloudy in the evening, becoming partly to mostly cloudy after midnight. Patchy light fog in the evening, then light to moderate fog after midnight. A chance of rain. Scattered thundershowers possible. Low 72°. Wind south around 8 mph, gusting to 19 mph, in the evening, becoming southwest after midnight. Chance of precipitation 50 percent. Precipitation mostly less than a quarter of an inch. |
| Saturday |
Cloudy. Patchy light fog in the morning. A slight chance of rain in the morning, then a chance of rain in the afternoon. Scattered thunderstorms likely. High 81°. UV index up to 4. Wind west-northwest around 10 mph, gusting to 28 mph. Chance of precipitation 40 percent. Precipitation mostly less than a tenth of an inch. |
| Saturday night |
Dense overcast in the evening, becoming cloudy after midnight. A chance of rain in the evening, then a slight chance of rain after midnight. Scattered thunderstorms likely. Breezy. Low 69°. Wind northwest around 11 mph, gusting to 29 mph. Chance of precipitation 40 percent. Precipitation mostly less than a tenth of an inch. |
| Sunday |
Mostly cloudy to cloudy in the morning, becoming partly to mostly cloudy in the afternoon. A chance of rain. High 79°. UV index up to 7. Wind north around 11 mph, gusting to 27 mph. Chance of precipitation 40 percent. Precipitation mostly around a tenth of an inch. |
| Sunday night |
Mostly clear in the evening, becoming clear after midnight. Moderate fog after midnight. Relatively cool. Low 64°. Wind north around 5 mph, gusting to 24 mph. |
| Monday |
Sunny. Light to moderate fog in the morning. High 85°. UV index up to 9. Wind north around 5 mph, gusting to 23 mph. |
| Monday night |
Fair in the evening, becoming mostly clear after midnight. Patchy light fog after midnight. Relatively cool. Low 65°. Wind northeast around 3 mph, gusting to 20 mph. |
| Tuesday |
Sunny. Patchy light fog in the morning. High 88°. UV index up to 9. Wind east-northeast around 3 mph, gusting to 21 mph. |
| Tuesday night |
Mostly clear in the evening, becoming fair after midnight. Patchy light fog after midnight. Relatively cool. Low 66°. Wind east around 4 mph, gusting to 17 mph. |
| Wednesday |
Sunny in the morning, becoming partly cloudy in the afternoon. Patchy light fog in the morning. Hot. High 91°. Heat index up to 96°. UV index up to 9. Wind southeast around 5 mph, gusting to 22 mph. |
| Wednesday night |
Partly to mostly cloudy in the evening, becoming partly cloudy after midnight. Patchy light fog after midnight. Low 70°. Wind east-southeast around 10 mph, gusting to 23 mph, in the evening, becoming south-southeast around 7 mph after midnight. |
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