| WXSIM Forecast for:
O'Fallon Issued by: OFallonweather.com |
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| Updated: Friday, 28-Nov-2025 05:00 am | ||||||||||||||||||||||||||||||||||||||||||||||||
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| Today |
Sunny in the morning, becoming partly to mostly sunny in the afternoon. High 39°. Wind north-northwest around 2 mph, gusting to 17 mph, in the morning, becoming east-northeast in the afternoon. |
| Tonight |
Cloudy in the evening, becoming dense overcast after midnight. A slight chance of snow in the evening, then a chance of a mix of snow and sleet after midnight. Low 28°. Wind chill ranging from 22 to 34. Wind east-southeast around 4 mph, gusting to 15 mph, in the evening, becoming 8 mph, gusting to 16 mph, after midnight. Chance of precipitation 40 percent. Precipitation (liquid equivalent) mostly around a tenth of an inch. Snow or ice (on ground) accumulation about half an inch. |
| Saturday |
Dense overcast. A mix of snow and sleet likely in the morning, then a mix of rain, sleet, and snow likely in the afternoon. Breezy. High 34°. Wind chill ranging from 18 to 27. Wind southeast around 11 mph, gusting to 21 mph. Chance of precipitation 80 percent. Precipitation (liquid equivalent) mostly around half an inch. Snow or ice (on ground) accumulation about an inch. |
| Saturday night |
Cloudy. A chance of a mix of snow, rain, and sleet in the evening, then a slight chance of snow after midnight. Breezy. Low 28°. Wind chill ranging from 19 to 26. Wind west-southwest around 11 mph, gusting to 24 mph, in the evening, becoming 14 mph, gusting to 29 mph, after midnight. Chance of precipitation 40 percent. Precipitation (liquid equivalent) mostly less than a tenth of an inch. Little or no snow or ice (on ground) accumulation expected. |
| Sunday |
Mostly cloudy to cloudy in the morning, becoming cloudy in the afternoon. Cold. High 30°. Wind chill around 19. Wind west around 11 mph, gusting to 28 mph. |
| Sunday night |
Mostly cloudy in the evening, becoming mostly cloudy to cloudy after midnight. Low 19°. Wind northwest around 4 mph, gusting to 21 mph, in the evening, becoming north after midnight. |
| Monday |
Cloudy in the morning, becoming dense overcast in the afternoon. High 30°. Wind east around 2 mph, gusting to 26 mph. |
| Monday night |
Dense overcast in the evening, becoming cloudy after midnight. A chance of snow in the evening, then a slight chance of snow after midnight. Low 20°. Wind northeast around 3 mph in the evening, becoming north-northwest after midnight. Chance of precipitation 40 percent. Precipitation (liquid equivalent) mostly less than a tenth of an inch. Snow accumulation about half an inch. |
| Tuesday |
Mostly cloudy in the morning, becoming mostly cloudy to cloudy in the afternoon. Patchy light fog in the morning. High 30°. Wind northwest around 4 mph, gusting to 17 mph. |
| Tuesday night |
Fair in the evening, becoming fair to partly cloudy after midnight. Cold. Low 15°. Wind south-southeast around 3 mph. |
| Wednesday |
Partly cloudy. High 46°. Wind south-southwest around 5 mph, gusting to 21 mph. |
| Wednesday night |
Mostly cloudy to cloudy in the evening, becoming mostly cloudy after midnight. Low 24°. Wind chill ranging from 18 to 33. Wind west-northwest around 6 mph, gusting to 19 mph. |
| Thursday |
Sunny. High 35°. Wind west-northwest around 7 mph, gusting to 24 mph. |
| Thursday night |
Clear in the evening, becoming mostly clear after midnight. Low 20°. Wind northwest around 2 mph, gusting to 18 mph, in the evening, becoming southeast after midnight. |
WXSIM forecast formatting script by Saratoga-Weather.org.
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