| WXSIM Forecast for:
O'Fallon Issued by: OFallonweather.com |
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| Updated: Friday, 05-Dec-2025 05:00 am | ||||||||||||||||||||||||||||||||||||||||||||||||
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| Today |
Partly to mostly sunny in the morning, becoming sunny in the afternoon. High 38°. Wind south around 3 mph. |
| Tonight |
Mostly cloudy in the evening, becoming partly to mostly cloudy after midnight. Low 24°. Wind southwest around 5 mph. |
| Saturday |
Partly to mostly sunny in the morning, becoming partly cloudy in the afternoon. High 43°. Wind west-northwest around 3 mph, gusting to 17 mph, in the morning, becoming northeast in the afternoon. |
| Saturday night |
Mostly cloudy to cloudy in the evening, becoming cloudy after midnight. A slight chance of a mix of rain, snow, sleet, and freezing rain after midnight. Low 31°. Wind east-southeast around 5 mph. Chance of precipitation 20 percent. Precipitation (liquid equivalent) mostly less than a tenth of an inch. Little or no snow or ice (on ground) accumulation expected. |
| Sunday |
Cloudy. A slight chance of a mix of snow and rain in the morning, then a slight chance of snow in the afternoon. High 37°. Wind north-northwest around 4 mph, gusting to 16 mph, in the morning, becoming 10 mph, gusting to 24 mph, in the afternoon. Chance of precipitation 30 percent. Precipitation (liquid equivalent) mostly less than a tenth of an inch. No snow accumulation expected. |
| Sunday night |
Mostly cloudy in the evening, becoming partly cloudy after midnight. Low 19°. Wind north-northwest around 9 mph, gusting to 24 mph, in the evening, becoming 5 mph, gusting to 19 mph, after midnight. |
| Monday |
Sunny. High 39°. Wind north around 2 mph, gusting to 17 mph, in the morning, becoming southeast in the afternoon. |
| Monday night |
Mostly clear in the evening, becoming partly cloudy after midnight. Low 24°. Wind chill ranging from 16 to 32. Wind south-southeast around 4 mph in the evening, becoming south-southwest around 8 mph after midnight. |
| Tuesday |
Sunny in the morning, becoming partly cloudy in the afternoon. High 48°. Wind south-southwest around 8 mph, gusting to 19 mph. |
| Tuesday night |
Partly to mostly cloudy in the evening, becoming partly cloudy after midnight. Breezy. Low 32°. Wind chill ranging from 23 to 34. Wind south-southwest around 12 mph, gusting to 18 mph. |
| Wednesday |
Partly to mostly sunny in the morning, becoming mostly cloudy to cloudy in the afternoon. A slight chance of rain. High 49°. Wind west-southwest around 8 mph, gusting to 24 mph, in the morning, becoming west-northwest in the afternoon. Chance of precipitation 20 percent. Precipitation mostly less than a tenth of an inch. |
| Wednesday night |
Mostly cloudy to cloudy in the evening, becoming mostly cloudy after midnight. Light to moderate fog. Low 33°. Wind southwest around 6 mph, gusting to 18 mph, in the evening, becoming south after midnight. |
| Thursday |
Mostly cloudy in the morning, becoming partly to mostly cloudy in the afternoon. Patchy light fog in the morning. Breezy and relatively mild. High 55°. Wind south-southwest around 13 mph, gusting to 24 mph, in the morning, becoming west in the afternoon. |
| Thursday night |
Fair to partly cloudy in the evening, becoming partly cloudy after midnight. Breezy. Low 28°. Wind chill ranging from 18 to 39. Wind west-northwest around 13 mph, gusting to 26 mph. |
WXSIM forecast formatting script by Saratoga-Weather.org.