| WXSIM Forecast for:
O'Fallon Issued by: OFallonweather.com |
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| Updated: Sunday, 30-Nov-2025 05:00 am | ||||||||||||||||||||||||||||||||||||||||||||||||
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| Today |
Mostly cloudy in the morning, becoming mostly cloudy to cloudy in the afternoon. Breezy and cold. High 30°. Wind chill ranging from 13 to 20. Wind west-northwest around 12 mph, gusting to 28 mph. |
| Tonight |
Partly to mostly cloudy in the evening, becoming cloudy after midnight. Low 20°. Wind west-northwest around 3 mph, gusting to 21 mph, in the evening, becoming northeast after midnight. |
| Monday |
Dense overcast. A chance of snow. High 29°. Wind east around 2 mph, gusting to 29 mph. Chance of precipitation 30 percent. Precipitation (liquid equivalent) mostly less than a tenth of an inch. Little or no snow accumulation expected. |
| Monday night |
Dense overcast in the evening, becoming mostly cloudy after midnight. Patchy light fog after midnight. A chance of snow in the evening, then a slight chance of snow after midnight. Cold. Low 18°. Wind north-northwest around 2 mph. Chance of precipitation 30 percent. Precipitation (liquid equivalent) mostly less than a tenth of an inch. Snow accumulation about a quarter inch. |
| Tuesday |
Mostly cloudy in the morning, becoming partly cloudy in the afternoon. Patchy light fog in the morning. High 34°. Wind northwest around 3 mph, gusting to 18 mph, in the morning, becoming west-southwest in the afternoon. |
| Tuesday night |
Fair to partly cloudy in the evening, becoming fair after midnight. Low 21°. Wind chill ranging from 15 to 28. Wind south-southeast around 4 mph. |
| Wednesday |
Mostly cloudy in the morning, becoming mostly cloudy to cloudy in the afternoon. High 44°. Wind south-southwest around 4 mph, gusting to 20 mph. |
| Wednesday night |
Dense overcast in the evening, becoming mostly cloudy to cloudy after midnight. Low 22°. Wind chill ranging from 15 to 35. Wind northwest around 7 mph, gusting to 21 mph. |
| Thursday |
Partly cloudy. High 34°. Wind northwest around 6 mph, gusting to 22 mph, in the morning, becoming north-northeast in the afternoon. |
| Thursday night |
Partly to mostly cloudy in the evening, becoming cloudy after midnight. Low 22°. Wind east-northeast around 3 mph in the evening, becoming east-southeast after midnight. |
| Friday |
Cloudy in the morning, becoming dense overcast in the afternoon. A chance of a mix of sleet and snow in the morning, then a chance of a mix of sleet, freezing rain, and snow in the afternoon. High 31°. Wind east-southeast around 4 mph. Chance of precipitation 70 percent. Precipitation (liquid equivalent) mostly around a quarter of an inch. Snow or ice (on ground) accumulation about half an inch. Little if any freezing rain accumulation. |
| Friday night |
Dense overcast. Patchy light fog after midnight. A slight chance of a mix of freezing rain, sleet, and snow in the evening, then a chance of a mix of freezing rain and rain after midnight. Low 27°, but temperatures rising after midnight. Wind southeast around 3 mph. Chance of precipitation 60 percent. Precipitation (liquid equivalent) mostly less than a quarter of an inch. No snow or ice (on ground) accumulation expected. Above-ground freezing rain accumulation up to 0.1 inches. |
| Saturday |
Cloudy. Patchy light fog in the morning. A chance of rain in the morning, then a slight chance of rain in the afternoon. High 42°. Wind south-southeast around 2 mph. Chance of precipitation 40 percent. Precipitation mostly less than a tenth of an inch. |
| Saturday night |
Dense overcast. Patchy light fog after midnight. A slight chance of rain in the evening, then a chance of a mix of rain and snow after midnight. Low 33°. Wind north around 2 mph in the evening, becoming 5 mph after midnight. Chance of precipitation 40 percent. Precipitation (liquid equivalent) mostly less than a tenth of an inch. No snow accumulation expected. |
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