WXSIM Forecast for: O'Fallon
Issued by: OFallonweather.com
Updated: Sunday, 08-Feb-2026 04:00 pm
 
Tonight

Mostly Clear
Mostly Clear
Monday

Mostly Sunny
Mostly Sunny
Monday
night
Clear
Clear
Tuesday

Mostly Sunny
Mostly Sunny
Tuesday
night
Partly Cloudy
Partly Cloudy
Wednesday

Mostly Sunny
Mostly Sunny
Wednesday
night
Partly Cloudy
Partly Cloudy
Thursday

Mostly Cloudy
Mostly Cloudy
Low: 26° High: 63° Low: 35° High: 65° Low: 34° High: 57° Low: 28° High: 49°
               
ESE
4-20
mph
SE→S
2-18
mph
SSW
6
mph
NW
6-26
mph
NNW
5-20
mph
N
3-22
mph
NNE→E
2-18
mph
ESE
5-21
mph

 

Tonight
 
Mostly clear in the evening, becoming clear after midnight. Low 26°. Wind east-southeast around 4 mph, gusting to 20 mph.
Monday
 
Sunny in the morning, becoming partly to mostly sunny in the afternoon. Unusually mild. High 63°. Wind southeast around 2 mph, gusting to 18 mph, in the morning, becoming south in the afternoon.
Monday night
 
Clear. Low 35°. Wind south-southwest around 6 mph.
Tuesday
 
Sunny in the morning, becoming mostly sunny in the afternoon. Unusually mild. High 65°. Wind northwest around 6 mph, gusting to 26 mph.
Tuesday night
 
Fair to partly cloudy. Low 34°. Wind north-northwest around 5 mph, gusting to 20 mph.
Wednesday
 
Sunny in the morning, becoming mostly sunny in the afternoon. Relatively mild. High 57°. Wind north around 3 mph, gusting to 22 mph.
Wednesday night
 
Fair to partly cloudy. Low 28°. Wind north-northeast around 2 mph, gusting to 18 mph, in the evening, becoming east after midnight.
Thursday
 
Mostly cloudy in the morning, becoming mostly cloudy to cloudy in the afternoon. High 49°. Wind east-southeast around 5 mph, gusting to 21 mph.
Thursday night
 
Mostly cloudy to cloudy in the evening, becoming cloudy after midnight. A chance of rain in the evening, then a slight chance of rain after midnight. Low 38°. Wind southeast around 7 mph, gusting to 20 mph. Chance of precipitation 50 percent. Precipitation mostly around a tenth of an inch.
Friday
 
Cloudy in the morning, becoming mostly cloudy to cloudy in the afternoon. Patchy light fog in the morning. A slight chance of rain. Relatively mild. High 50°. Wind east-southeast around 6 mph, gusting to 24 mph. Chance of precipitation 20 percent. Precipitation mostly less than a tenth of an inch.
Friday night
 
Cloudy. Patchy light fog after midnight. Low 34°. Wind east-northeast around 5 mph, gusting to 22 mph.
Saturday
 
Cloudy in the morning, becoming mostly cloudy in the afternoon. Patchy light fog in the morning. High 45°. Wind northeast around 5 mph, gusting to 21 mph.
Saturday night
 
Mostly clear in the evening, becoming clear after midnight. Low 27°. Wind north-northeast around 3 mph, gusting to 19 mph.

WXSIM forecast formatting script by Saratoga-Weather.org.

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