| WXSIM Forecast for:
O'Fallon Issued by: OFallonweather.com |
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| Updated: Sunday, 24-May-2026 05:00 am | ||||||||||||||||||||||||||||||||||||||||||||||||
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| Today |
Partly to mostly cloudy in the morning, becoming mostly sunny in the afternoon. A slight chance of rain. High 81°. UV index up to 8. Wind north around 4 mph, gusting to 23 mph. Chance of precipitation 20 percent. Precipitation mostly less than a tenth of an inch. |
| Tonight |
Clear. Patchy light fog after midnight. Low 58°. Wind north-northeast around 2 mph, gusting to 21 mph, in the evening, becoming east after midnight. |
| Monday |
Sunny. Patchy light fog in the morning. High 82°. UV index up to 8. Wind east around 4 mph, gusting to 24 mph. |
| Monday night |
Clear in the evening, becoming fair to partly cloudy after midnight. Patchy light fog after midnight. Low 60°. Wind east-southeast around 4 mph, gusting to 19 mph. |
| Tuesday |
Mostly cloudy to cloudy. Patchy light fog in the morning. A chance of rain. Scattered thundershowers possible. High 77°. UV index up to 5. Wind east-southeast around 5 mph, gusting to 22 mph. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch. |
| Tuesday night |
Cloudy in the evening, becoming dense overcast after midnight. Patchy light fog after midnight. A slight chance of rain in the evening, then a chance of rain after midnight. Scattered thundershowers possible. Low 66°. Wind east-southeast around 3 mph, gusting to 17 mph. Chance of precipitation 50 percent. Precipitation mostly less than a quarter of an inch. |
| Wednesday |
Mostly cloudy in the morning, becoming partly cloudy in the afternoon. Patchy light fog in the morning, then light to moderate fog in the afternoon. A chance of rain in the morning, then rain likely in the afternoon. Scattered thundershowers possible. High 77°. UV index up to 7. Wind east-southeast around 2 mph, gusting to 15 mph. Chance of precipitation 70 percent. Precipitation mostly around half an inch. |
| Wednesday night |
Mostly cloudy. Patchy light fog in the evening, then light to moderate fog after midnight. A slight chance of rain in the evening, then a chance of rain after midnight. Scattered thundershowers possible. Low 65°. Wind east-northeast around 3 mph. Chance of precipitation 40 percent. Precipitation mostly less than a tenth of an inch. |
| Thursday |
Cloudy in the morning, becoming mostly cloudy in the afternoon. Patchy light fog in the morning. A chance of rain. Precipitation showery or intermittent. High 78°. UV index up to 7. Wind east-northeast around 6 mph, gusting to 21 mph. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch. |
| Thursday night |
Mostly cloudy in the evening, becoming cloudy after midnight. Low 64°. Wind east-northeast around 5 mph, gusting to 17 mph. |
| Friday |
Dense overcast. A chance of rain. Precipitation showery or intermittent. High 76°. UV index up to 5. Wind east around 7 mph, gusting to 21 mph. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch. |
| Friday night |
Cloudy. A slight chance of rain. Precipitation showery or intermittent. Low 66°. Wind east around 6 mph, gusting to 18 mph. Chance of precipitation 20 percent. Precipitation mostly less than a tenth of an inch. |
| Saturday |
Mostly cloudy to cloudy in the morning, becoming mostly cloudy in the afternoon. High 81°. UV index up to 7. Wind east around 8 mph, gusting to 26 mph. |
| Saturday night |
Mostly cloudy to cloudy in the evening, becoming partly to mostly cloudy after midnight. Low 63°. Wind east around 7 mph, gusting to 24 mph. |
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