WXSIM Forecast for: O'Fallon
Issued by: OFallonweather.com
Updated: Tuesday, 02-Dec-2025 05:00 am
 
Today

Partly Cloudy
Partly Cloudy
Tonight

Partly Cloudy
Partly Cloudy
Wednesday

Partly Cloudy
Partly Cloudy
Wednesday
night
Mix
Mix
Thursday

Mostly Sunny
Mostly Sunny
Thursday
night
Partly Cloudy
Partly Cloudy
Friday

Mostly Cloudy
Mostly Cloudy
Friday
night
Mostly Cloudy
Mostly Cloudy
<.1 in.
.25 in.
High: 35° Low: 20° High: 42° Low: 20° High: 34° Low: 18° High: 41° Low: 24°
               
NW→WSW
4-21
mph
SSE
4
mph
SSW→WNW
4-22
mph
NNW
7-24
mph
NNE
4-21
mph
ENE→SE
2
mph
S
3-17
mph
WSW
3
mph

 

Today
 
Partly to mostly cloudy in the morning, becoming partly cloudy in the afternoon. High 35°. Wind northwest around 4 mph, gusting to 21 mph, in the morning, becoming west-southwest in the afternoon.
Tonight
 
Fair to partly cloudy in the evening, becoming mostly clear after midnight. Low 20°. Wind south-southeast around 4 mph.
Wednesday
 
Partly cloudy in the morning, becoming partly to mostly cloudy in the afternoon. High 42°. Wind south-southwest around 4 mph, gusting to 22 mph, in the morning, becoming west-northwest in the afternoon.
Wednesday night
 
Cloudy. A slight chance of a mix of snow and sleet in the evening, then a slight chance of snow after midnight. Low 20°. Wind north-northwest around 7 mph, gusting to 24 mph. Chance of precipitation 20 percent. Precipitation (liquid equivalent) mostly less than a tenth of an inch. Snow or ice (on ground) accumulation about a quarter inch.
Thursday
 
Mostly sunny in the morning, becoming sunny in the afternoon. High 34°. Wind north-northeast around 4 mph, gusting to 21 mph.
Thursday night
 
Fair to partly cloudy in the evening, becoming partly cloudy after midnight. Low 18°. Wind east-northeast around 2 mph in the evening, becoming southeast after midnight.
Friday
 
Partly to mostly cloudy in the morning, becoming sunny in the afternoon. High 41°. Wind south around 3 mph, gusting to 17 mph.
Friday night
 
Mostly clear in the evening, becoming partly to mostly cloudy after midnight. Low 24°. Wind west-southwest around 3 mph.
Saturday
 
Mostly cloudy in the morning, becoming partly cloudy in the afternoon. High 44°. Wind west-southwest around 2 mph, gusting to 17 mph, in the morning, becoming north-northeast in the afternoon.
Saturday night
 
Partly to mostly cloudy in the evening, becoming cloudy after midnight. A slight chance of a mix of freezing rain and sleet in the evening, then a chance of a mix of sleet, freezing rain, and snow after midnight. Low 29°. Wind east-northeast around 4 mph. Chance of precipitation 40 percent. Precipitation (liquid equivalent) mostly less than a tenth of an inch. Little or no snow or ice (on ground) accumulation expected. Little if any freezing rain accumulation.
Sunday
 
Dense overcast. A chance of a mix of freezing rain, sleet, snow, and rain in the morning, then a chance of snow in the afternoon. High 34°. Wind chill ranging from 23 to 28. Wind east-northeast around 6 mph, gusting to 18 mph, in the morning, becoming north-northeast in the afternoon. Chance of precipitation 50 percent. Precipitation (liquid equivalent) mostly around a tenth of an inch. Snow or ice (on ground) accumulation about a quarter inch. Little if any freezing rain accumulation.
Sunday night
 
Cloudy. A chance of snow. Low 25°. Wind north-northeast around 5 mph, gusting to 18 mph. Chance of precipitation 30 percent. Precipitation (liquid equivalent) mostly less than a tenth of an inch. Snow accumulation about a quarter inch.
Monday
 
Mostly cloudy to cloudy. High 36°. Wind north-northeast around 3 mph, gusting to 15 mph.
Monday night
 
Cloudy. Low 27°. Wind north-northeast near calm in the evening, becoming east-southeast after midnight.

WXSIM forecast formatting script by Saratoga-Weather.org.

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