| WXSIM Forecast for:
O'Fallon Issued by: OFallonweather.com |
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| Updated: Thursday, 06-Aug-2026 04:00 pm | ||||||||||||||||||||||||||||||||||||||||||||||||
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| Tonight |
Mostly cloudy in the evening, becoming partly cloudy after midnight. Patchy light fog in the evening, then light to moderate fog after midnight. A chance of rain. Scattered thundershowers possible. Relatively cool. Low 66°. Wind south-southeast around 5 mph. Chance of precipitation 50 percent. Precipitation mostly less than a quarter of an inch. |
| Friday |
Partly to mostly cloudy in the morning, becoming mostly cloudy in the afternoon. Patchy light fog in the morning. A chance of rain. High 84°. UV index up to 5. Wind southwest around 4 mph, gusting to 17 mph. Chance of precipitation 50 percent. Precipitation mostly around a tenth of an inch. |
| Friday night |
Partly cloudy. Patchy light fog in the evening, then moderate fog after midnight. A chance of rain. Low 69°. Wind south around 5 mph in the evening, becoming west-southwest after midnight. Chance of precipitation 40 percent. Precipitation mostly around a tenth of an inch. |
| Saturday |
Partly cloudy in the morning, becoming sunny 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 87°. Heat index up to 95°. UV index up to 8. Wind west-northwest around 3 mph, gusting to 20 mph, in the morning, becoming east in the afternoon. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch. |
| Saturday night |
Clear in the evening, becoming fair after midnight. Patchy light fog in the evening, then light to moderate fog after midnight. Low 71°. Wind southeast around 3 mph in the evening, becoming south-southwest after midnight. |
| Sunday |
Mostly sunny in the morning, becoming sunny in the afternoon. Patchy light fog in the morning. Hot. High 92°. Heat index up to 102°. UV index up to 8. Wind south around 7 mph, gusting to 23 mph. |
| Sunday night |
Clear. Patchy light fog after midnight. Low 73°. Wind south-southwest around 6 mph, gusting to 17 mph. |
| Monday |
Sunny in the morning, becoming partly to mostly sunny in the afternoon. Patchy light fog in the morning. Hot. High 94°. Heat index up to 105°. UV index up to 7. Wind south-southwest around 8 mph, gusting to 25 mph. |
| Monday night |
Clear in the evening, becoming fair after midnight. Patchy light fog after midnight. Low 75°. Wind south-southwest around 6 mph, gusting to 18 mph. |
| Tuesday |
Partly to mostly sunny in the morning, becoming partly cloudy in the afternoon. Very hot. High 95°. Heat index up to 105°. UV index up to 7. Wind southwest around 7 mph, gusting to 24 mph. |
| Tuesday night |
Fair to partly cloudy. Low 74°. Wind south-southeast around 4 mph, gusting to 16 mph, in the evening, becoming south-southwest after midnight. |
| Wednesday |
Partly to mostly cloudy in the morning, becoming partly cloudy in the afternoon. Hot. High 94°. Heat index up to 104°. UV index up to 9. Wind southwest around 7 mph, gusting to 24 mph, in the morning, becoming 12 mph, gusting to 28 mph, in the afternoon. |
| Wednesday night |
Partly to mostly cloudy in the evening, becoming partly cloudy after midnight. Patchy light fog after midnight. A chance of rain. Scattered thundershowers possible. Low 70°. Wind northwest around 4 mph, gusting to 20 mph, in the evening, becoming north-northeast after midnight. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch. |
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