| WXSIM Forecast for:
O'Fallon Issued by: OFallonweather.com |
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| Updated: Sunday, 28-Dec-2025 05:00 am | ||||||||||||||||||||||||||||||||||||||||||||||||
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| Today |
Cloudy. A chance of rain. Scattered thundershowers possible. Breezy with near record warmth. High 74°. Wind south-southwest around 10 mph, gusting to 27 mph, in the morning, becoming west around 16 mph, gusting to 36 mph, in the afternoon. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch. |
| Tonight |
Mostly cloudy in the evening, becoming fair to partly cloudy after midnight. Windy. Low 19°. Wind chill ranging from 9 to 52. Wind west-northwest around 17 mph, gusting to 36 mph. |
| Monday |
Partly cloudy in the morning, becoming partly to mostly sunny in the afternoon. Windy and cold. High 21°. Wind chill ranging from 2 to 9. Wind west-northwest around 16 mph, gusting to 34 mph. |
| Monday night |
Fair in the evening, becoming clear after midnight. Cold. Low 11°. Wind chill as low as 0. Wind west-northwest around 9 mph, gusting to 21 mph. |
| Tuesday |
Sunny in the morning, becoming partly cloudy in the afternoon. High 38°. Wind chill ranging from 3 to 32. Wind west-northwest around 6 mph, gusting to 24 mph, in the morning, becoming west-southwest in the afternoon. |
| Tuesday night |
Partly cloudy in the evening, becoming fair after midnight. Low 23°. Wind west-southwest around 7 mph, gusting to 19 mph. |
| Wednesday |
Partly cloudy in the morning, becoming partly to mostly cloudy in the afternoon. Relatively mild. High 46°. Wind west around 6 mph, gusting to 24 mph. |
| Wednesday night |
Fair to partly cloudy in the evening, becoming mostly clear after midnight. Low 21°. Wind northwest around 3 mph, gusting to 18 mph. |
| Thursday |
Partly to mostly sunny. High 39°. Wind north-northwest around 5 mph, gusting to 24 mph. |
| Thursday night |
Partly cloudy. Low 21°. Wind north around 2 mph, gusting to 19 mph. |
| Friday |
Partly cloudy in the morning, becoming mostly sunny in the afternoon. High 44°. Wind east around 5 mph, gusting to 24 mph. |
| Friday night |
Mostly clear in the evening, becoming clear after midnight. Low 19°. Wind northeast around 4 mph, gusting to 19 mph, in the evening, becoming north-northwest after midnight. |
| Saturday |
Partly to mostly sunny. High 44°. Wind north-northwest around 2 mph, gusting to 21 mph, in the morning, becoming south-southeast in the afternoon. |
| Saturday night |
Clear. Low 20°. Wind south-southeast around 4 mph, gusting to 17 mph. |
WXSIM forecast formatting script by Saratoga-Weather.org.