| WXSIM Forecast for:
O'Fallon Issued by: OFallonweather.com |
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| Updated: Thursday, 04-Dec-2025 04:00 pm | ||||||||||||||||||||||||||||||||||||||||||||||||
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| Tonight |
Fair in the evening, becoming clear after midnight. Cold. Low 9°. Wind east around 2 mph in the evening, becoming south-southeast after midnight. |
| Friday |
Partly to mostly sunny in the morning, becoming sunny in the afternoon. High 41°. Wind south-southwest around 4 mph, gusting to 17 mph. |
| Friday night |
Partly to mostly cloudy in the evening, becoming cloudy after midnight. Low 27°. Wind chill ranging from 21 to 31. Wind south-southwest around 5 mph in the evening, becoming west after midnight. |
| Saturday |
Mostly cloudy in the morning, becoming mostly cloudy to cloudy in the afternoon. High 40°. Wind west around 2 mph in the morning, becoming east-northeast in the afternoon. |
| Saturday night |
Cloudy. A slight chance of a mix of freezing rain and sleet in the evening, then a chance of a mix of freezing rain, sleet, rain, and snow after midnight. Low 30°. Wind east around 5 mph, gusting to 16 mph. Chance of precipitation 50 percent. Precipitation (liquid equivalent) mostly less than a quarter of an inch. Little or no snow or ice (on ground) accumulation expected. Little if any freezing rain accumulation. |
| Sunday |
Cloudy in the morning, becoming mostly cloudy to cloudy in the afternoon. Patchy light fog in the morning. A chance of a mix of snow, rain, sleet, and freezing rain in the morning, then a slight chance of snow in the afternoon. High 35°. Wind chill ranging from 24 to 29. Wind north-northeast around 5 mph, gusting to 18 mph, in the morning, becoming 11 mph, gusting to 25 mph, in the afternoon. Chance of precipitation 40 percent. Precipitation (liquid equivalent) mostly less than a tenth of an inch. No snow or ice (on ground) accumulation expected. |
| Sunday night |
Partly cloudy in the evening, becoming fair to partly cloudy after midnight. Low 18°. Wind north around 8 mph, gusting to 24 mph, in the evening, becoming 4 mph, gusting to 18 mph, after midnight. |
| Monday |
Sunny in the morning, becoming partly cloudy in the afternoon. High 39°. Wind east-northeast around 2 mph, gusting to 17 mph, in the morning, becoming south in the afternoon. |
| Monday night |
Fair to partly cloudy in the evening, becoming partly cloudy after midnight. Low 25°. Wind chill ranging from 17 to 30. Wind south-southwest around 5 mph in the evening, becoming 8 mph after midnight. |
| Tuesday |
Partly cloudy in the morning, becoming partly to mostly sunny in the afternoon. High 50°. Wind south-southwest around 8 mph, gusting to 21 mph. |
| Tuesday night |
Partly cloudy in the evening, becoming mostly cloudy after midnight. Low 31°. Wind chill ranging from 23 to 36. Wind south-southwest around 10 mph, gusting to 15 mph. |
| Wednesday |
Mostly cloudy to cloudy in the morning, becoming dense overcast in the afternoon. A chance of rain in the morning, then a slight chance of a mix of rain and snow in the afternoon. Breezy. High 44°. Wind southwest around 11 mph, gusting to 24 mph, in the morning, becoming west-northwest around 15 mph, gusting to 29 mph, in the afternoon. Chance of precipitation 40 percent. Precipitation (liquid equivalent) mostly less than a tenth of an inch. No snow accumulation expected. |
| Wednesday night |
Partly to mostly cloudy. Low 25°. Wind west-northwest around 10 mph, gusting to 27 mph, in the evening, becoming 3 mph, gusting to 18 mph, after midnight. |
WXSIM forecast formatting script by Saratoga-Weather.org.
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