| WXSIM Forecast for:
O'Fallon Issued by: OFallonweather.com |
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| Updated: Friday, 25-Sep-2026 05:00 am | ||||||||||||||||||||||||||||||||||||||||||||||||
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| Today |
Partly to mostly cloudy in the morning, becoming cloudy in the afternoon. High 73°. Wind east-southeast around 3 mph, gusting to 20 mph. |
| Tonight |
Partly to mostly cloudy. Low 56°. Wind east-northeast around 3 mph, gusting to 18 mph. |
| Saturday |
Mostly cloudy to cloudy in the morning, becoming cloudy in the afternoon. A slight chance of rain. High 74°. UV index up to 4. Wind east around 4 mph, gusting to 22 mph. Chance of precipitation 20 percent. Precipitation mostly less than a tenth of an inch. |
| Saturday night |
Dense overcast in the evening, becoming mostly cloudy after midnight. Low 57°. Wind east around 3 mph, gusting to 18 mph. |
| Sunday |
Partly cloudy in the morning, becoming partly to mostly sunny in the afternoon. High 77°. UV index up to 6. Wind east-southeast around 4 mph, gusting to 21 mph. |
| Sunday night |
Fair. Patchy light fog after midnight. Low 52°. Wind east-northeast around 3 mph, gusting to 16 mph. |
| Monday |
Partly to mostly sunny in the morning, becoming partly cloudy in the afternoon. Patchy light fog in the morning. High 76°. UV index up to 5. Wind east-northeast around 3 mph, gusting to 20 mph. |
| Monday night |
Mostly clear in the evening, becoming fair after midnight. Low 52°. Wind east-northeast around 3 mph in the evening, becoming southeast after midnight. |
| Tuesday |
Partly cloudy. Warm. High 80°. UV index up to 6. Wind southeast around 6 mph, gusting to 21 mph. |
| Tuesday night |
Partly to mostly cloudy in the evening, becoming mostly cloudy after midnight. Low 60°. Wind southeast around 7 mph, gusting to 16 mph. |
| Wednesday |
Cloudy in the morning, becoming mostly cloudy in the afternoon. A chance of rain. Warm. High 82°. UV index up to 5. Wind south around 4 mph, gusting to 17 mph. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch. |
| Wednesday night |
Mostly cloudy to cloudy in the evening, becoming fair to partly cloudy after midnight. Warm. Low 66°. Wind south around 8 mph. |
| Thursday |
Cloudy in the morning, becoming dense overcast in the afternoon. Rain likely. Precipitation showery or intermittent. Warm. High 78°. Wind south around 9 mph, gusting to 17 mph, in the morning, becoming 3 mph in the afternoon. Chance of precipitation 60 percent. Precipitation mostly around a quarter of an inch. |
| Thursday night |
Dense overcast in the evening, becoming fair to partly cloudy after midnight. Patchy light fog in the evening, then moderate fog after midnight. Rain likely in the evening, then a slight chance of rain after midnight. Precipitation showery or intermittent. Warm. Low 71°. Wind south-southwest around 8 mph, gusting to 20 mph. Chance of precipitation 80 percent. Precipitation mostly between half an inch and one inch. |
WXSIM forecast formatting script by Saratoga-Weather.org.