| WXSIM Forecast for:
O'Fallon Issued by: OFallonweather.com |
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| Updated: Saturday, 24-Jan-2026 04:00 pm | ||||||||||||||||||||||||||||||||||||||||||||||||
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| Tonight |
Dense overcast. A mix of snow and sleet likely. Cold. Low 5°. Wind chill as low as -6. Wind northeast around 7 mph, gusting to 22 mph. Chance of precipitation 70 percent. Precipitation (liquid equivalent) mostly around a quarter of an inch. Snow or ice (on ground) accumulation 2 to 3 inches. |
| Sunday |
Dense overcast. Snow likely. Very cold. High 10°. Wind chill around -5. Wind north around 9 mph, gusting to 20 mph. Chance of precipitation 60 percent. Precipitation (liquid equivalent) mostly less than a quarter of an inch. Snow accumulation 2 to 3 inches. |
| Sunday night |
Mostly cloudy in the evening, becoming clear after midnight. Very cold. Low -4°. Wind chill ranging from -14 to -5. Wind north-northwest around 7 mph, gusting to 19 mph. |
| Monday |
Mostly sunny in the morning, becoming partly to mostly sunny in the afternoon. Patchy light fog in the morning. Cold. High 15°. Wind chill ranging from -15 to 6. Wind west-northwest around 6 mph, gusting to 22 mph. |
| Monday night |
Clear. Cold. Low 7°. Wind chill ranging from -8 to 5. Wind southwest around 7 mph, gusting to 19 mph, in the evening, becoming 10 mph, gusting to 16 mph, after midnight. |
| Tuesday |
Sunny in the morning, becoming partly to mostly sunny in the afternoon. High 35°. Wind chill ranging from -7 to 27. Wind west around 8 mph, gusting to 27 mph. |
| Tuesday night |
Partly cloudy in the evening, becoming fair after midnight. Cold. Low 10°. Wind northwest around 3 mph, gusting to 21 mph. |
| Wednesday |
Sunny in the morning, becoming partly cloudy in the afternoon. High 32°. Wind west-southwest around 3 mph, gusting to 27 mph. |
| Wednesday night |
Partly to mostly cloudy in the evening, becoming fair to partly cloudy after midnight. Low 13°. Wind northwest around 4 mph, gusting to 22 mph. |
| Thursday |
Partly cloudy in the morning, becoming partly to mostly cloudy in the afternoon. High 28°. Wind north-northwest around 3 mph, gusting to 21 mph, in the morning, becoming north-northeast in the afternoon. |
| Thursday night |
Mostly cloudy to cloudy in the evening, becoming cloudy after midnight. Low 19°. Wind east-northeast around 2 mph. |
| Friday |
Cloudy in the morning, becoming dense overcast in the afternoon. A chance of snow. High 29°. Wind chill ranging from 17 to 24. Wind north-northwest around 3 mph, gusting to 15 mph. Chance of precipitation 30 percent. Precipitation (liquid equivalent) mostly less than a tenth of an inch. Little or no snow accumulation expected. |
| Friday night |
Dense overcast in the evening, becoming fair after midnight. A chance of snow in the evening, then a slight chance of snow after midnight. Low 16°. Wind chill ranging from 7 to 20. Wind north-northwest around 9 mph, gusting to 24 mph. Chance of precipitation 40 percent. Precipitation (liquid equivalent) mostly less than a tenth of an inch. Snow accumulation about half an inch. |
WXSIM forecast formatting script by Saratoga-Weather.org.