| WXSIM Forecast for:
O'Fallon Issued by: OFallonweather.com |
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| Updated: Monday, 15-Dec-2025 05:00 am | ||||||||||||||||||||||||||||||||||||||||||||||||
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| Today |
Mostly sunny in the morning, becoming sunny in the afternoon. High 39°. Wind chill ranging from 1 to 32. Wind south-southwest around 8 mph, gusting to 24 mph. |
| Tonight |
Clear. Low 19°. Wind chill ranging from 13 to 28. Wind southwest around 5 mph. |
| Tuesday |
Sunny. Relatively mild. High 52°. Wind southwest around 7 mph, gusting to 23 mph. |
| Tuesday night |
Partly cloudy. Low 28°. Wind southwest around 6 mph. |
| Wednesday |
Sunny. Relatively mild. High 55°. Wind west around 3 mph, gusting to 15 mph, in the morning, becoming east-southeast in the afternoon. |
| Wednesday night |
Partly cloudy in the evening, becoming cloudy after midnight. Low 38°, but temperatures rising after midnight. Wind south-southeast around 7 mph in the evening, becoming 11 mph, gusting to 17 mph, after midnight. |
| Thursday |
Cloudy in the morning, becoming partly to mostly cloudy in the afternoon. Light to moderate fog in the afternoon. Rain likely in the morning, then a chance of rain in the afternoon. Breezy and relatively mild. High 51°, but temperatures falling in the afternoon. Wind south-southwest around 11 mph, gusting to 26 mph, in the morning, becoming west-northwest in the afternoon. Chance of precipitation 70 percent. Precipitation mostly around half an inch. |
| Thursday night |
Partly cloudy in the evening, becoming fair to partly cloudy after midnight. Breezy. Low 25°. Wind chill ranging from 18 to 35. Wind west-northwest around 14 mph, gusting to 27 mph, in the evening, becoming 11 mph, gusting to 27 mph, after midnight. |
| Friday |
Sunny in the morning, becoming partly to mostly sunny in the afternoon. High 42°. Wind west-northwest around 5 mph, gusting to 23 mph, in the morning, becoming south in the afternoon. |
| Friday night |
Partly cloudy in the evening, becoming fair to partly cloudy after midnight. Low 26°. Wind chill ranging from 18 to 33. Wind south-southeast around 9 mph, gusting to 18 mph. |
| Saturday |
Partly cloudy. Relatively mild. High 55°. Wind south-southeast around 9 mph, gusting to 22 mph, in the morning, becoming south-southwest in the afternoon. |
| Saturday night |
Partly to mostly cloudy. Low 26°. Wind northwest around 6 mph, gusting to 15 mph. |
| Sunday |
Partly cloudy. High 43°. Wind north-northeast around 5 mph, gusting to 17 mph, in the morning, becoming east-northeast in the afternoon. |
| Sunday night |
Partly to mostly cloudy in the evening, becoming dense overcast after midnight. Low 30°. Wind chill ranging from 23 to 33. Wind east around 8 mph. |
WXSIM forecast formatting script by Saratoga-Weather.org.