| WXSIM Forecast for:
O'Fallon Issued by: OFallonweather.com |
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| Updated: Friday, 23-Jan-2026 04:00 pm | ||||||||||||||||||||||||||||||||||||||||||||||||
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| Tonight |
Cloudy. Very cold. Low 2°. Wind chill as low as -11. Wind north-northeast around 8 mph, gusting to 22 mph. |
| Saturday |
Dense overcast. A slight chance of snow in the morning, then a chance of snow in the afternoon. Very cold. High 9°. Wind chill ranging from -10 to -3. Wind north-northeast around 6 mph, gusting to 20 mph. Chance of precipitation 40 percent. Precipitation (liquid equivalent) mostly less than a tenth of an inch. Snow accumulation about an inch. |
| Saturday night |
Dense overcast. Snow likely. Cold. Low 5°. Wind chill as low as -5. Wind north-northeast around 6 mph, gusting to 19 mph. Chance of precipitation 60 percent. Precipitation (liquid equivalent) mostly around a tenth of an inch. Snow accumulation around 2 inches. |
| Sunday |
Dense overcast. Snow likely. Very cold. High 9°. Wind chill around -6. Wind north around 8 mph, gusting to 18 mph. Chance of precipitation 70 percent. Precipitation (liquid equivalent) mostly around a quarter of an inch. Snow accumulation 3 to 5 inches. |
| Sunday night |
Partly to mostly cloudy in the evening, becoming fair after midnight. Very cold. Low -2°. Wind chill ranging from -12 to -5. Wind north-northwest around 7 mph, gusting to 18 mph. |
| Monday |
Partly cloudy in the morning, becoming partly to mostly sunny in the afternoon. Cold. High 16°. Wind chill ranging from -12 to 6. Wind northwest around 6 mph, gusting to 22 mph. |
| Monday night |
Clear. Cold. Low 6°. Wind chill ranging from -7 to 6. Wind southwest around 6 mph, gusting to 17 mph, in the evening, becoming 10 mph, gusting to 15 mph, after midnight. |
| Tuesday |
Sunny. High 32°. Wind chill ranging from -7 to 24. Wind southwest around 9 mph, gusting to 24 mph, in the morning, becoming west in the afternoon. |
| Tuesday night |
Partly cloudy in the evening, becoming fair after midnight. Cold. Low 10°. Wind west around 4 mph, gusting to 20 mph. |
| Wednesday |
Partly to mostly sunny in the morning, becoming mostly cloudy to cloudy in the afternoon. High 26°. Wind west around 4 mph, gusting to 25 mph. |
| Wednesday night |
Mostly cloudy to cloudy in the evening, becoming fair after midnight. A slight chance of snow. Cold. Low 11°. Wind north around 4 mph, gusting to 21 mph. Chance of precipitation 20 percent. Precipitation (liquid equivalent) mostly less than a tenth of an inch. Snow accumulation about a quarter inch. |
| Thursday |
Sunny in the morning, becoming partly to mostly sunny in the afternoon. High 28°. Wind north-northwest around 4 mph, gusting to 21 mph. |
| Thursday night |
Partly cloudy in the evening, becoming partly to mostly cloudy after midnight. Low 14°. Wind northwest near calm in the evening, becoming north-northeast after midnight. |
WXSIM forecast formatting script by Saratoga-Weather.org.