| WXSIM Forecast for:
O'Fallon Issued by: OFallonweather.com |
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| Updated: Thursday, 27-Nov-2025 05:00 am | ||||||||||||||||||||||||||||||||||||||||||||||||
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| Today |
Sunny. High 41°. Wind northwest around 8 mph, gusting to 26 mph. |
| Tonight |
Clear in the evening, becoming mostly clear after midnight. Low 20°. Wind northwest around 5 mph, gusting to 19 mph. |
| Friday |
Sunny in the morning, becoming partly cloudy in the afternoon. High 42°. Wind north-northwest around 2 mph, gusting to 17 mph, in the morning, becoming south-southwest in the afternoon. |
| Friday night |
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, freezing rain, and sleet after midnight. Low 30°. Wind chill ranging from 25 to 38. Wind east-southeast around 4 mph, gusting to 17 mph, in the evening, becoming 7 mph, gusting to 17 mph, after midnight. Chance of precipitation 50 percent. Precipitation (liquid equivalent) mostly around a tenth of an inch. Snow or ice (on ground) accumulation about half an inch. Little if any freezing rain accumulation. |
| Saturday |
Dense overcast. Patchy light fog in the afternoon. Snow likely in the morning, then a mix of snow, sleet, and freezing rain likely in the afternoon. High 33°. Wind chill around 22. Wind east-southeast around 10 mph, gusting to 21 mph. Chance of precipitation 80 percent. Precipitation (liquid equivalent) mostly between half an inch and one inch. Snow or ice (on ground) accumulation 2 to 3 inches. Little if any freezing rain accumulation. |
| Saturday night |
Cloudy. Patchy light fog in the evening. A chance of a mix of snow, sleet, rain, and freezing rain in the evening, then a chance of snow after midnight. Low 28°. Wind chill ranging from 19 to 26. Wind south-southwest around 9 mph, gusting to 20 mph, in the evening, becoming west around 13 mph, gusting to 25 mph, after midnight. Chance of precipitation 60 percent. Precipitation (liquid equivalent) mostly less than a quarter of an inch. Snow or ice (on ground) accumulation about a quarter inch. Little if any freezing rain accumulation. |
| Sunday |
Mostly cloudy to cloudy in the morning, becoming cloudy in the afternoon. Cold. High 30°. Wind chill around 20. Wind west around 10 mph, gusting to 26 mph. |
| Sunday night |
Mostly cloudy. Cold. Low 19°. Wind north-northwest around 4 mph, gusting to 20 mph. |
| Monday |
Cloudy. A slight chance of snow. Cold. High 28°. Wind northeast around 2 mph, gusting to 17 mph. Chance of precipitation 20 percent. Precipitation (liquid equivalent) mostly less than a tenth of an inch. Little or no snow accumulation expected. |
| Monday night |
Cloudy in the evening, becoming mostly cloudy after midnight. A slight chance of snow. Low 21°. Wind northeast around 3 mph, gusting to 16 mph. Chance of precipitation 20 percent. Precipitation (liquid equivalent) mostly less than a tenth of an inch. Little or no snow accumulation expected. |
| Tuesday |
Mostly cloudy in the morning, becoming cloudy in the afternoon. A slight chance of snow in the morning, then a chance of snow in the afternoon. Cold. High 29°. Wind north around 4 mph. Chance of precipitation 40 percent. Precipitation (liquid equivalent) mostly less than a tenth of an inch. Snow accumulation about half an inch. |
| Tuesday night |
Partly cloudy in the evening, becoming fair to partly cloudy after midnight. Patchy light fog after midnight. Cold. Low 19°. Wind chill ranging from 13 to 22. Wind south around 4 mph. |
| Wednesday |
Mostly cloudy in the morning, becoming mostly cloudy to cloudy in the afternoon. Patchy light fog in the morning. High 40°. Wind south-southeast around 7 mph, gusting to 16 mph. |
| Wednesday night |
Mostly cloudy to cloudy in the evening, becoming cloudy after midnight. Low 30°. Wind chill ranging from 23 to 31. Wind south-southwest around 7 mph, gusting to 16 mph, in the evening, becoming west-northwest after midnight. |
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