WXSIM Forecast for: O'Fallon
Issued by: OFallonweather.com
Updated: Friday, 28-Nov-2025 04:00 pm
 
Tonight

Snow
Snow
Saturday

Rain likely
Rain likely
Saturday
night
Mix
Mix
Sunday

Mostly Cloudy
Mostly Cloudy
Sunday
night
Mostly Cloudy
Mostly Cloudy
Monday

Snow
Snow
Monday
night
Snow
Snow
Tuesday

Fog a.m.
Fog a.m.
<.25 in.
.5 in.
.5 in.
1 in.
<.1 in. <.1 in. <.25 in.
1 in.
Low: 26° High: 35° Low: 28° High: 29° Low: 18° High: 30° Low: 20° High: 31°
WCh: 18° WCh: 16° WCh: 19°          
ESE
5-17→8
mph
SE
11-22
mph
WSW
12-27
mph
W
11-27
mph
NW→NE
5-21→2
mph
E
2-23
mph
ENE→NNW
2
mph
NNW
4-15
mph

 

Tonight
 
Cloudy in the evening, becoming dense overcast after midnight. A slight chance of snow in the evening, then a chance of snow after midnight. Low 26°. Wind chill ranging from 18 to 28. Wind east-southeast around 5 mph, gusting to 17 mph, in the evening, becoming 8 mph after midnight. Chance of precipitation 50 percent. Precipitation (liquid equivalent) mostly less than a quarter of an inch. Snow accumulation about half an inch.
Saturday
 
Dense overcast. A mix of snow and sleet likely in the morning, then a mix of snow, sleet, and rain likely in the afternoon. Breezy. High 35°. Wind chill ranging from 16 to 27. Wind southeast around 11 mph, gusting to 22 mph. Chance of precipitation 80 percent. Precipitation (liquid equivalent) mostly around half an inch. Snow or ice (on ground) accumulation about an inch.
Saturday night
 
Cloudy. A slight chance of a mix of snow, rain, and sleet in the evening, then a slight chance of snow after midnight. Breezy. Low 28°. Wind chill ranging from 19 to 26. Wind west-southwest around 12 mph, gusting to 27 mph. Chance of precipitation 30 percent. Precipitation (liquid equivalent) mostly less than a tenth of an inch. Little or no snow or ice (on ground) accumulation expected.
Sunday
 
Mostly cloudy to cloudy in the morning, becoming cloudy in the afternoon. Cold. High 29°. Wind chill around 18. Wind west around 11 mph, gusting to 27 mph.
Sunday night
 
Mostly cloudy in the evening, becoming mostly cloudy to cloudy after midnight. Low 18°. Wind northwest around 5 mph, gusting to 21 mph, in the evening, becoming northeast around 2 mph after midnight.
Monday
 
Cloudy in the morning, becoming dense overcast in the afternoon. A slight chance of snow. High 30°. Wind east around 2 mph, gusting to 23 mph. Chance of precipitation 20 percent. Precipitation (liquid equivalent) mostly less than a tenth of an inch. Little or no snow accumulation expected.
Monday night
 
Dense overcast in the evening, becoming cloudy after midnight. Patchy light fog after midnight. A chance of snow. Low 20°. Wind east-northeast around 2 mph in the evening, becoming north-northwest after midnight. Chance of precipitation 50 percent. Precipitation (liquid equivalent) mostly less than a quarter of an inch. Snow accumulation about an inch.
Tuesday
 
Partly to mostly cloudy in the morning, becoming mostly cloudy in the afternoon. Light to moderate fog in the morning. High 31°. Wind north-northwest around 4 mph, gusting to 15 mph.
Tuesday night
 
Fair in the evening, becoming mostly clear after midnight. Cold. Low 14°. Wind south around 3 mph.
Wednesday
 
Partly to mostly sunny in the morning, becoming mostly cloudy in the afternoon. High 37°. Wind chill ranging from 8 to 31. Wind south around 5 mph, gusting to 16 mph, in the morning, becoming west in the afternoon.
Wednesday night
 
Partly to mostly cloudy in the evening, becoming partly cloudy after midnight. Low 20°. Wind chill ranging from 15 to 28. Wind northwest around 6 mph.
Thursday
 
Mostly cloudy in the morning, becoming cloudy in the afternoon. A chance of snow. Cold. High 27°. Wind chill ranging from 13 to 19. Wind north-northwest around 6 mph, gusting to 18 mph. Chance of precipitation 50 percent. Precipitation (liquid equivalent) mostly around a tenth of an inch. Snow accumulation about half an inch.
Thursday night
 
Mostly cloudy to cloudy in the evening, becoming cloudy after midnight. A slight chance of a mix of snow and sleet in the evening, then a slight chance of a mix of sleet and snow after midnight. Low 22°. Wind northeast around 3 mph, gusting to 17 mph. Chance of precipitation 20 percent. Precipitation (liquid equivalent) mostly less than a tenth of an inch. Little or no snow or ice (on ground) accumulation expected.

WXSIM forecast formatting script by Saratoga-Weather.org.

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