WXSIM Forecast for: O'Fallon
Issued by: OFallonweather.com
Updated: Thursday, 12-Nov-2026 04:00 pm
 
Tonight

Partly Cloudy
Partly Cloudy
Friday

Fog a.m.
Fog a.m.
Friday
night
Clear
Clear
Saturday

Sunny
Sunny
Saturday
night
Clear
Clear
Sunday

Mostly Sunny
Mostly Sunny
Sunday
night
Clear
Clear
Monday

Sunny
Sunny
Low: 27° High: 43° Low: 24° High: 48° Low: 24° High: 51° Low: 27° High: 55°
               
NW
8-28
mph
NW
8-24
mph
NW
4-17
mph
NNW
2-19
mph
ENE
calm

ESE
1-19
mph
SE
calm

SSE
2-19
mph

 

Tonight
 
Partly cloudy in the evening, becoming mostly clear after midnight. Cold. Low 27°. Wind northwest around 8 mph, gusting to 28 mph.
Friday
 
Partly to mostly sunny. Patchy light fog in the morning. High 43°. Wind northwest around 8 mph, gusting to 24 mph.
Friday night
 
Fair in the evening, becoming clear after midnight. Cold. Low 24°. Wind northwest around 4 mph, gusting to 17 mph.
Saturday
 
Sunny. High 48°. Wind north-northwest around 2 mph, gusting to 19 mph.
Saturday night
 
Clear. Low 24°. Wind east-northeast near calm.
Sunday
 
Mostly sunny in the morning, becoming partly to mostly sunny in the afternoon. High 51°. Wind east-southeast around 1 mph, gusting to 19 mph.
Sunday night
 
Clear. Low 27°. Wind southeast near calm.
Monday
 
Sunny. High 55°. Wind south-southeast around 2 mph, gusting to 19 mph.
Monday night
 
Clear. Low 29°. Wind south-southeast around 3 mph.
Tuesday
 
Partly to mostly sunny in the morning, becoming partly cloudy in the afternoon. Mild. High 59°. Wind south-southeast around 4 mph, gusting to 22 mph.
Tuesday night
 
Clear. Low 33°. Wind south-southeast around 4 mph.
Wednesday
 
Mostly sunny in the morning, becoming partly to mostly cloudy in the afternoon. Mild. High 62°. Wind south-southeast around 6 mph, gusting to 20 mph, in the morning, becoming 10 mph, gusting to 23 mph, in the afternoon.
Wednesday night
 
Mostly cloudy to cloudy in the evening, becoming cloudy after midnight. Low 45°. Wind south around 8 mph, gusting to 16 mph.

WXSIM forecast formatting script by Saratoga-Weather.org.

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