| WXSIM Forecast for:
O'Fallon Issued by: OFallonweather.com |
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| Updated: Thursday, 04-Dec-2025 05:00 am | ||||||||||||||||||||||||||||||||||||||||||||||||
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| Today |
Partly cloudy. High 29°. Wind north-northwest around 5 mph, gusting to 18 mph, in the morning, becoming northeast in the afternoon. |
| Tonight |
Fair to partly cloudy in the evening, becoming mostly clear after midnight. Cold. Low 8°. Wind east-northeast around 2 mph in the evening, becoming south-southeast after midnight. |
| Friday |
Sunny. High 40°. Wind south-southeast around 4 mph, gusting to 17 mph. |
| Friday night |
Partly to mostly cloudy in the evening, becoming mostly cloudy to cloudy after midnight. Low 25°. Wind chill ranging from 19 to 30. Wind southwest around 5 mph. |
| Saturday |
Partly to mostly cloudy in the morning, becoming mostly cloudy in the afternoon. High 39°. Wind west-northwest around 2 mph in the morning, becoming northeast in the afternoon. |
| Saturday night |
Mostly cloudy to cloudy in the evening, becoming cloudy after midnight. A chance of a mix of freezing rain and sleet after midnight. Low 28°. Wind east around 4 mph. Chance of precipitation 40 percent. Precipitation (liquid equivalent) mostly less than a tenth of an inch. Little or no ice (on ground) accumulation expected. Little if any freezing rain accumulation. |
| Sunday |
Cloudy. A chance of a mix of rain, snow, freezing rain, and sleet in the morning, then a slight chance of a mix of snow, rain, and sleet in the afternoon. High 39°. Wind east-southeast around 4 mph, gusting to 19 mph, in the morning, becoming north around 9 mph, gusting to 23 mph, in the afternoon. Chance of precipitation 50 percent. Precipitation (liquid equivalent) mostly less than a tenth of an inch. No snow or ice (on ground) accumulation expected. Little if any freezing rain accumulation. |
| Sunday night |
Cloudy in the evening, becoming partly cloudy after midnight. Patchy light fog after midnight. A chance of snow in the evening, then a slight chance of snow after midnight. Low 19°. Wind north around 9 mph, gusting to 22 mph, in the evening, becoming 6 mph, gusting to 19 mph, after midnight. Chance of precipitation 30 percent. Precipitation (liquid equivalent) mostly less than a tenth of an inch. Snow accumulation about a quarter inch. |
| Monday |
Partly to mostly sunny. Patchy light fog in the morning. High 38°. Wind north around 3 mph, gusting to 18 mph, in the morning, becoming southeast in the afternoon. |
| Monday night |
Partly cloudy in the evening, becoming mostly clear after midnight. Low 25°. Wind chill ranging from 16 to 30. Wind south-southeast around 6 mph, gusting to 16 mph, in the evening, becoming south-southwest around 9 mph, gusting to 15 mph, after midnight. |
| Tuesday |
Partly cloudy. High 48°. Wind west-southwest around 8 mph, gusting to 22 mph. |
| Tuesday night |
Mostly cloudy in the evening, becoming dense overcast after midnight. A chance of rain after midnight. Low 34°, but temperatures rising after midnight. Wind south-southwest around 7 mph, gusting to 16 mph, in the evening, becoming 12 mph, gusting to 18 mph, after midnight. Chance of precipitation 40 percent. Precipitation mostly less than a tenth of an inch. |
| Wednesday |
Cloudy in the morning, becoming mostly cloudy to cloudy in the afternoon. A chance of a mix of rain and snow in the morning, then a slight chance of a mix of snow and rain in the afternoon. Breezy. High 36°. Wind chill around 26. Wind west around 12 mph, gusting to 24 mph. Chance of precipitation 50 percent. Precipitation (liquid equivalent) mostly less than a tenth of an inch. No snow accumulation expected. |
| Wednesday night |
Partly cloudy in the evening, becoming cloudy after midnight. Low 26°. Wind northwest around 6 mph, gusting to 21 mph, in the evening, becoming 3 mph after midnight. |
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