| WXSIM Forecast for:
O'Fallon Issued by: OFallonweather.com |
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| Updated: Friday, 23-Jan-2026 05:00 am | ||||||||||||||||||||||||||||||||||||||||||||||||
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| Today |
Cloudy in the morning, becoming partly to mostly cloudy in the afternoon. Cold. High 15°. Wind chill ranging from -4 to 2. Wind north around 10 mph, gusting to 28 mph. |
| Tonight |
Cloudy in the evening, becoming mostly cloudy to cloudy after midnight. Very cold. Low 0°. Wind chill ranging from -11 to 1. Wind north around 8 mph, gusting to 25 mph. |
| Saturday |
Cloudy in the morning, becoming dense overcast in the afternoon. A slight chance of snow. Very cold. High 9°. Wind chill ranging from -12 to -2. Wind northeast around 7 mph, gusting to 21 mph. Chance of precipitation 20 percent. Precipitation (liquid equivalent) mostly less than a tenth of an inch. Snow accumulation about half an inch. |
| Saturday night |
Dense overcast. A chance of snow in the evening, then snow likely after midnight. Cold. Low 5°. Wind chill as low as -6. Wind northeast around 6 mph, gusting to 20 mph. Chance of precipitation 70 percent. Precipitation (liquid equivalent) mostly around a quarter of an inch. Snow accumulation 3 to 5 inches. |
| Sunday |
Dense overcast. Snow likely in the morning, then a chance of snow in the afternoon. Very cold. High 9°. Wind chill around -6. Wind north-northeast around 8 mph, gusting to 19 mph. Chance of precipitation 80 percent. Precipitation (liquid equivalent) mostly between a quarter and half an inch. Snow accumulation 4 to 6 inches. |
| Sunday night |
Partly to mostly cloudy in the evening, becoming mostly clear after midnight. Very cold. Low -2°. Wind chill ranging from -13 to -5. Wind north-northwest around 7 mph, gusting to 17 mph. |
| Monday |
Partly cloudy in the morning, becoming partly to mostly sunny in the afternoon. Cold. High 15°. Wind chill ranging from -13 to 6. Wind northwest around 6 mph, gusting to 21 mph. |
| Monday night |
Clear. Very cold. Low 5°. Wind chill ranging from -9 to 5. Wind southwest around 6 mph, gusting to 16 mph, in the evening, becoming 10 mph, gusting to 16 mph, after midnight. |
| Tuesday |
Sunny in the morning, becoming partly cloudy in the afternoon. High 34°. Wind chill ranging from -9 to 26. Wind west-southwest around 8 mph, gusting to 25 mph. |
| Tuesday night |
Fair to partly cloudy in the evening, becoming partly cloudy after midnight. Low 10°. Wind west-northwest around 3 mph, gusting to 18 mph. |
| Wednesday |
Partly cloudy in the morning, becoming cloudy in the afternoon. A slight chance of snow in the morning, then a chance of snow in the afternoon. High 27°. Wind west-northwest around 2 mph, gusting to 16 mph. Chance of precipitation 40 percent. Precipitation (liquid equivalent) mostly less than a tenth of an inch. Snow accumulation about half an inch. |
| Wednesday night |
Cloudy in the evening, becoming partly cloudy after midnight. Patchy light fog after midnight. A chance of snow in the evening, then a slight chance of snow after midnight. Cold. Low 13°. Wind chill ranging from 6 to 19. Wind north-northwest around 3 mph, gusting to 17 mph. Chance of precipitation 40 percent. Precipitation (liquid equivalent) mostly less than a tenth of an inch. Snow accumulation about half an inch. |
| Thursday |
Mostly sunny in the morning, becoming partly to mostly cloudy in the afternoon. Patchy light fog in the morning. Cold. High 23°. Wind chill ranging from 4 to 16. Wind north-northwest around 6 mph, gusting to 21 mph. |
| Thursday night |
Mostly cloudy in the evening, becoming cloudy after midnight. Low 15°. Wind chill ranging from 9 to 18. Wind north-northwest around 2 mph, gusting to 17 mph. |
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