| WXSIM Forecast for:
O'Fallon Issued by: OFallonweather.com |
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| Updated: Wednesday, 03-Jun-2026 05:00 am | ||||||||||||||||||||||||||||||||||||||||||||||||
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| Today |
Sunny. High 82°. UV index up to 8. Wind east around 5 mph, gusting to 23 mph. |
| Tonight |
Fair to partly cloudy in the evening, becoming partly cloudy after midnight. Relatively cool. Low 56°. Wind east-southeast around 4 mph, gusting to 18 mph, in the evening, becoming south after midnight. |
| Thursday |
Partly to mostly cloudy in the morning, becoming partly cloudy in the afternoon. High 84°. UV index up to 7. Wind south around 7 mph, gusting to 24 mph. |
| Thursday night |
Fair to partly cloudy in the evening, becoming mostly cloudy to cloudy after midnight. Low 63°. Wind south around 8 mph, gusting to 21 mph. |
| Friday |
Mostly cloudy to cloudy in the morning, becoming mostly cloudy in the afternoon. A slight chance of rain. Scattered thundershowers possible. High 84°. UV index up to 5. Wind south-southwest around 9 mph, gusting to 24 mph. Chance of precipitation 20 percent. Precipitation mostly less than a tenth of an inch. |
| Friday night |
Mostly cloudy. Patchy light fog after midnight. A chance of rain in the evening, then a slight chance of rain after midnight. Scattered thundershowers possible. Low 66°. Wind south-southwest around 6 mph, gusting to 21 mph. Chance of precipitation 40 percent. Precipitation mostly around a tenth of an inch. |
| Saturday |
Mostly cloudy. Patchy light fog in the morning. A slight chance of rain in the morning, then a chance of rain in the afternoon. Scattered thundershowers possible. High 85°. UV index up to 6. Wind west-southwest around 7 mph, gusting to 22 mph. Chance of precipitation 40 percent. Precipitation mostly less than a tenth of an inch. |
| Saturday night |
Mostly cloudy in the evening, becoming partly cloudy after midnight. Light to moderate fog after midnight. A chance of rain. Scattered thundershowers possible. Low 69°. Wind west-southwest around 4 mph, gusting to 16 mph. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch. |
| Sunday |
Partly to mostly cloudy in the morning, becoming cloudy in the afternoon. Light to moderate fog in the morning. Rain likely. Scattered thundershowers possible. High 81°. UV index up to 5. Wind south around 4 mph, gusting to 16 mph, in the morning, becoming east-southeast in the afternoon. Chance of precipitation 60 percent. Precipitation mostly around a quarter of an inch. |
| Sunday night |
Cloudy in the evening, becoming mostly cloudy to cloudy after midnight. Light to moderate fog in the evening, then moderate fog after midnight. A chance of rain in the evening, then rain likely after midnight. Scattered thundershowers possible. Low 70°. Wind east-southeast around 6 mph, gusting to 15 mph. Chance of precipitation 70 percent. Precipitation mostly around half an inch. |
| Monday |
Dense overcast. Light to moderate fog. A chance of rain in the morning, then rain likely in the afternoon. Scattered thundershowers possible. High 76°. Wind east-southeast around 7 mph, gusting to 19 mph. Chance of precipitation 80 percent. Precipitation mostly between half an inch and one inch. |
| Monday night |
Cloudy in the evening, becoming mostly cloudy to cloudy after midnight. Light to moderate fog in the evening, then patchy light fog after midnight. A chance of rain in the evening. Scattered thundershowers possible. Low 69°. Wind east around 6 mph, gusting to 16 mph. Chance of precipitation 60 percent. Precipitation mostly less than a quarter of an inch. |
| Tuesday |
Mostly cloudy in the morning, becoming partly cloudy in the afternoon. Patchy light fog in the morning. High 84°. UV index up to 10. Wind east around 8 mph, gusting to 26 mph. |
| Tuesday night |
Clear. Patchy light fog after midnight. Low 64°. Wind east around 5 mph, gusting to 23 mph. |
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