| WXSIM Forecast for:
O'Fallon Issued by: OFallonweather.com |
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| Updated: Friday, 12-Dec-2025 05:00 am | ||||||||||||||||||||||||||||||||||||||||||||||||
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| Today |
Partly cloudy in the morning, becoming mostly cloudy in the afternoon. High 42°. Wind north around 6 mph, gusting to 23 mph. |
| Tonight |
Partly to mostly cloudy in the evening, becoming cloudy after midnight. Low 26°. Wind north-northwest around 3 mph, gusting to 18 mph. |
| Saturday |
Mostly cloudy to cloudy in the morning, becoming dense overcast in the afternoon. High 29°. Wind chill around 21. Wind north around 6 mph, gusting to 24 mph. |
| Saturday night |
Mostly cloudy in the evening, becoming clear after midnight. Cold. Low 11°. Wind chill ranging from 2 to 19. Wind north around 8 mph, gusting to 26 mph. |
| Sunday |
Sunny. Cold. High 24°. Wind north-northwest around 8 mph, gusting to 23 mph, in the morning, becoming 4 mph, gusting to 23 mph, in the afternoon. |
| Sunday night |
Clear. Cold. Low 12°. Wind chill ranging from 3 to 17. Wind southeast around 4 mph, gusting to 15 mph. |
| Monday |
Sunny. High 41°. Wind south-southwest around 9 mph, gusting to 27 mph. |
| Monday night |
Fair to partly cloudy in the evening, becoming fair after midnight. Low 21°. Wind southwest around 4 mph. |
| Tuesday |
Sunny in the morning, becoming partly to mostly sunny in the afternoon. Relatively mild. High 54°. Wind southwest around 7 mph, gusting to 22 mph. |
| Tuesday night |
Partly cloudy in the evening, becoming partly to mostly cloudy after midnight. Low 33°. Wind southwest around 7 mph. |
| Wednesday |
Cloudy. A slight chance of rain. Relatively mild. High 52°. Wind south-southwest around 8 mph, gusting to 17 mph. Chance of precipitation 20 percent. Precipitation mostly less than a tenth of an inch. |
| Wednesday night |
Cloudy in the evening, becoming partly to mostly cloudy after midnight. Relatively mild. Low 47°. Wind south-southwest around 11 mph, gusting to 18 mph. |
| Thursday |
Cloudy. A slight chance of rain. Mild. High 59°. Wind southwest around 6 mph. Chance of precipitation 20 percent. Precipitation mostly less than a tenth of an inch. |
| Thursday night |
Cloudy in the evening, becoming dense overcast after midnight. Patchy light fog after midnight. A chance of rain. Relatively mild. Low 50°. Wind southwest around 3 mph in the evening, becoming west-northwest after midnight. Chance of precipitation 50 percent. Precipitation mostly less than a quarter of an inch. |
WXSIM forecast formatting script by Saratoga-Weather.org.