| WXSIM Forecast for:
O'Fallon Issued by: OFallonweather.com |
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| Updated: Saturday, 24-Jan-2026 05:00 am | ||||||||||||||||||||||||||||||||||||||||||||||||
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| Today |
Dense overcast. A slight chance of snow in the morning, then a chance of snow in the afternoon. Very cold. High 4°. Wind chill around -11. Wind north-northeast around 6 mph, gusting to 18 mph. Chance of precipitation 40 percent. Precipitation (liquid equivalent) mostly less than a tenth of an inch. Snow accumulation about an inch. |
| Tonight |
Dense overcast. A mix of snow and sleet likely. Very cold. Low -2°. Wind chill ranging from -15 to -9. Wind north-northeast around 6 mph. Chance of precipitation 70 percent. Precipitation (liquid equivalent) mostly less than a quarter of an inch. Snow or ice (on ground) accumulation 2 to 3 inches. |
| Sunday |
Dense overcast. Snow likely in the morning, then a chance of snow in the afternoon. Very cold. High 5°. Wind chill ranging from -16 to -11. Wind north around 9 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 clear after midnight. Very cold. Low -6°. Wind chill ranging from -16 to -11. Wind north-northwest around 7 mph, gusting to 16 mph. |
| Monday |
Sunny in the morning, becoming mostly sunny in the afternoon. Patchy light fog in the morning. Cold. High 16°. Wind chill ranging from -17 to 7. Wind west-northwest around 6 mph, gusting to 21 mph. |
| Monday night |
Clear. Very cold. Low 5°. Wind chill ranging from -10 to 6. Wind southwest around 7 mph, gusting to 17 mph, in the evening, becoming 11 mph, gusting to 16 mph, after midnight. |
| Tuesday |
Sunny in the morning, becoming partly to mostly sunny in the afternoon. High 30°. Wind chill ranging from -9 to 22. Wind southwest around 8 mph, gusting to 20 mph, in the morning, becoming west in the afternoon. |
| Tuesday night |
Partly cloudy. Low 11°. Wind west around 2 mph, gusting to 16 mph. |
| Wednesday |
Mostly cloudy in the morning, becoming cloudy in the afternoon. High 29°. Wind west-southwest around 3 mph, gusting to 26 mph. |
| Wednesday night |
Mostly cloudy to cloudy in the evening, becoming partly to mostly cloudy after midnight. A slight chance of snow. Cold. Low 11°. Wind chill ranging from 2 to 19. Wind northwest around 8 mph, gusting to 24 mph. Chance of precipitation 20 percent. Precipitation (liquid equivalent) mostly less than a tenth of an inch. Snow accumulation about a quarter inch. |
| Thursday |
Mostly cloudy to cloudy. Cold. High 14°. Wind chill ranging from 1 to 6. Wind northwest around 5 mph, gusting to 20 mph. |
| Thursday night |
Mostly cloudy to cloudy in the evening, becoming mostly cloudy after midnight. Cold. Low 10°. Wind north-northeast around 1 mph, gusting to 17 mph, in the evening, becoming southeast after midnight. |
| Friday |
Mostly cloudy in the morning, becoming mostly cloudy to cloudy in the afternoon. A slight chance of snow in the morning, then a chance of snow in the afternoon. Cold. High 22°. Wind chill around 11. Wind north-northeast around 2 mph in the morning, becoming 6 mph, gusting to 17 mph, in the afternoon. Chance of precipitation 30 percent. Precipitation (liquid equivalent) mostly less than a tenth of an inch. Snow accumulation about half an inch. |
| Friday night |
Fair to partly cloudy in the evening, becoming mostly cloudy after midnight. Low 13°. Wind north-northeast near calm. |
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