| WXSIM Forecast for:
O'Fallon Issued by: OFallonweather.com |
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| Updated: Wednesday, 26-Nov-2025 04:00 pm | ||||||||||||||||||||||||||||||||||||||||||||||||
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| Tonight |
Partly cloudy in the evening, becoming mostly cloudy after midnight. Low 24°. Wind chill ranging from 18 to 29. Wind west-northwest around 8 mph, gusting to 25 mph. |
| Thursday |
Partly to mostly sunny. High 39°. Wind west-northwest around 7 mph, gusting to 24 mph. |
| Thursday night |
Fair to partly cloudy. Cold. Low 19°. Wind west-northwest around 5 mph, gusting to 18 mph. |
| Friday |
Partly to mostly sunny in the morning, becoming partly to mostly cloudy in the afternoon. High 41°. Wind northwest around 2 mph, gusting to 17 mph, in the morning, becoming west-southwest in the afternoon. |
| Friday night |
Cloudy. A slight chance of a mix of sleet and snow in the evening, then a chance of a mix of snow and sleet after midnight. Low 29°. Wind chill ranging from 23 to 36. Wind east-southeast around 6 mph, gusting to 17 mph. 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 sleet, freezing rain, and snow likely in the afternoon. Cold. High 32°. Wind chill around 21. Wind east-southeast around 11 mph, gusting to 21 mph. Chance of precipitation 80 percent. Precipitation (liquid equivalent) mostly between 1 and 2 inches. Snow or ice (on ground) accumulation 3 to 5 inches. Above-ground freezing rain accumulation up to 0.2 inches. |
| Saturday night |
Dense overcast in the evening, becoming cloudy after midnight. Patchy light fog in the evening. A mix of freezing rain, sleet, and snow likely in the evening, then a chance of a mix of snow, freezing rain, and sleet after midnight. Breezy. Low 27°. Wind chill ranging from 18 to 23. Wind south-southeast around 9 mph, gusting to 20 mph, in the evening, becoming west around 14 mph, gusting to 24 mph, after midnight. Chance of precipitation 80 percent. Precipitation (liquid equivalent) mostly around half an inch. Snow or ice (on ground) accumulation about half an inch. Above-ground freezing rain accumulation up to 0.2 inches. |
| Sunday |
Cloudy in the morning, becoming mostly cloudy to cloudy in the afternoon. Breezy and cold. High 28°. Wind chill around 18. Wind west-northwest around 12 mph, gusting to 25 mph. |
| Sunday night |
Partly to mostly cloudy. Cold. Low 18°. Wind northwest around 5 mph, gusting to 19 mph. |
| Monday |
Cloudy. A chance of snow. Cold. High 27°. Wind north-northeast around 2 mph. Chance of precipitation 40 percent. Precipitation (liquid equivalent) mostly around a tenth of an inch. Snow accumulation about an inch. |
| Monday night |
Cloudy in the evening, becoming mostly cloudy to cloudy after midnight. A slight chance of snow. Low 20°. Wind north near calm. Chance of precipitation 20 percent. Precipitation (liquid equivalent) mostly less than a tenth of an inch. Little or no snow accumulation expected. |
| Tuesday |
Partly to mostly cloudy in the morning, becoming cloudy in the afternoon. Cold. High 26°. Wind northwest around 3 mph. |
| Tuesday night |
Mostly cloudy in the evening, becoming mostly clear after midnight. Cold. Low 21°. Wind chill ranging from 15 to 23. Wind south around 3 mph. |
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