| WXSIM Forecast for:
O'Fallon Issued by: OFallonweather.com |
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| Updated: Tuesday, 17-Feb-2026 05:00 am | ||||||||||||||||||||||||||||||||||||||||||||||||
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| Today |
Partly cloudy in the morning, becoming partly to mostly cloudy in the afternoon. Unusually warm. High 72°. Wind south-southeast around 5 mph, gusting to 18 mph, in the morning, becoming 9 mph, gusting to 26 mph, in the afternoon. |
| Tonight |
Mostly cloudy in the evening, becoming partly cloudy after midnight. Breezy and relatively mild. Low 55°. Wind south around 13 mph, gusting to 25 mph. |
| Wednesday |
Sunny. Exceptionally warm. High 76°. Wind west-southwest around 9 mph, gusting to 28 mph. |
| Wednesday night |
Fair to partly cloudy in the evening, becoming fair after midnight. Relatively mild. Low 45°. Wind south-southeast around 4 mph, gusting to 19 mph. |
| Thursday |
Partly to mostly sunny. Exceptionally warm. High 74°. Wind south around 6 mph, gusting to 22 mph, in the morning, becoming 11 mph, gusting to 28 mph, in the afternoon. |
| Thursday night |
Mostly clear in the evening, becoming partly cloudy after midnight. Breezy. Low 36°. Wind west-southwest around 12 mph, gusting to 27 mph. |
| Friday |
Sunny in the morning, becoming mostly sunny in the afternoon. Relatively mild. High 53°. Wind west-southwest around 10 mph, gusting to 29 mph. |
| Friday night |
Mostly clear in the evening, becoming mostly cloudy after midnight. Low 30°. Wind west-northwest around 5 mph, gusting to 21 mph. |
| Saturday |
Partly to mostly cloudy. A chance of snow in the morning, then a chance of a mix of rain and snow in the afternoon. High 41°. Wind northwest around 8 mph, gusting to 26 mph. Chance of precipitation 50 percent. Precipitation (liquid equivalent) mostly around a tenth of an inch. No snow accumulation expected. |
| Saturday night |
Partly cloudy in the evening, becoming mostly clear after midnight. Low 25°. Wind chill ranging from 18 to 33. Wind northwest around 8 mph, gusting to 23 mph. |
| Sunday |
Mostly sunny. Breezy. High 33°. Wind chill ranging from 15 to 24. Wind northwest around 13 mph, gusting to 31 mph. |
| Sunday night |
Clear. Cold. Low 21°. Wind chill ranging from 12 to 24. Wind northwest around 10 mph, gusting to 27 mph. |
| Monday |
Sunny in the morning, becoming partly to mostly sunny in the afternoon. High 40°. Wind northwest around 7 mph, gusting to 26 mph. |
| Monday night |
Mostly clear in the evening, becoming partly to mostly cloudy after midnight. Low 26°. Wind southwest around 2 mph, gusting to 17 mph. |
WXSIM forecast formatting script by Saratoga-Weather.org.