| WXSIM Forecast for:
O'Fallon Issued by: OFallonweather.com |
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| Updated: Sunday, 25-Jan-2026 05:00 am | ||||||||||||||||||||||||||||||||||||||||||||||||
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| Today |
Dense overcast in the morning, becoming cloudy in the afternoon. A chance of snow in the morning, then a slight chance of snow in the afternoon. Very cold. High 9°. Wind chill around -7. Wind north around 9 mph, gusting to 20 mph. Chance of precipitation 60 percent. Precipitation (liquid equivalent) mostly around a tenth of an inch. Snow accumulation around 2 inches. |
| Tonight |
Fair in the evening, becoming clear after midnight. Very cold. Low -5°. Wind chill ranging from -14 to -5. Wind north-northwest around 6 mph, gusting to 19 mph. |
| Monday |
Mostly sunny in the morning, becoming partly cloudy in the afternoon. Cold. High 17°. Wind chill ranging from -15 to 8. Wind west-northwest around 5 mph, gusting to 22 mph. |
| Monday night |
Clear. Cold. Low 7°. Wind chill ranging from -8 to 7. Wind southwest around 7 mph, gusting to 20 mph, in the evening, becoming 11 mph, gusting to 15 mph, after midnight. |
| Tuesday |
Sunny in the morning, becoming partly to mostly sunny in the afternoon. High 38°. Wind chill ranging from -7 to 31. Wind west around 8 mph, gusting to 28 mph. |
| Tuesday night |
Fair to partly cloudy in the evening, becoming mostly clear after midnight. Low 13°. Wind northwest around 3 mph, gusting to 22 mph. |
| Wednesday |
Sunny in the morning, becoming partly to mostly sunny in the afternoon. High 37°. Wind west-southwest around 4 mph, gusting to 28 mph. |
| Wednesday night |
Partly to mostly cloudy in the evening, becoming partly cloudy after midnight. A slight chance of snow. Low 14°. Wind northwest around 4 mph, gusting to 23 mph. Chance of precipitation 20 percent. Precipitation (liquid equivalent) mostly less than a tenth of an inch. Snow accumulation about a quarter inch. |
| Thursday |
Partly cloudy in the morning, becoming mostly cloudy to cloudy in the afternoon. High 32°. Wind north-northwest near calm. |
| Thursday night |
Mostly cloudy. A chance of snow. Low 19°. Wind east-northeast around 2 mph, gusting to 25 mph. Chance of precipitation 30 percent. Precipitation (liquid equivalent) mostly less than a tenth of an inch. Snow accumulation about half an inch. |
| Friday |
Mostly cloudy to cloudy. A chance of snow. High 25°. Wind chill around 14. Wind north-northeast around 6 mph, gusting to 26 mph. Chance of precipitation 30 percent. Precipitation (liquid equivalent) mostly less than a tenth of an inch. Snow accumulation about a quarter inch. |
| Friday night |
Partly cloudy. Low 12°. Wind north-northeast around 1 mph, gusting to 22 mph. |
| Saturday |
Mostly sunny in the morning, becoming partly cloudy in the afternoon. High 34°. Wind chill ranging from 13 to 29. Wind south-southeast around 1 mph, gusting to 21 mph, in the morning, becoming 5 mph, gusting to 24 mph, in the afternoon. |
| Saturday night |
Mostly cloudy in the evening, becoming cloudy after midnight. Low 25°. Wind chill ranging from 18 to 27. Wind east-southeast around 6 mph, gusting to 23 mph. |
WXSIM forecast formatting script by Saratoga-Weather.org.