WXSIM Forecast for: O'Fallon
Issued by: OFallonweather.com
Updated: Friday, 31-Oct-2025 05:00 am
 
Today

Partly Cloudy
Partly Cloudy
Tonight

Mostly Cloudy
Mostly Cloudy
Saturday

Mostly Cloudy
Mostly Cloudy
Saturday
night
Fog late
Fog late
Sunday

Fog a.m.
Fog a.m.
Sunday
night
Fog late
Fog late
Monday

Fog a.m.
Fog a.m.
Monday
night
Partly Cloudy
Partly Cloudy
<.1 in.
High: 62° Low: 42° High: 55° Low: 37° High: 57° Low: 36° High: 63° Low: 38°
               
WSW
3-24→7-24
mph
W
4-17
mph
WNW
5-24
mph
WNW
4-21
mph
NW→WSW
2-19
mph
S
4
mph
SW→WNW
6-24
mph
NW→NNE
2
mph

 

Today
 
Sunny in the morning, becoming partly cloudy in the afternoon. High 62°. Wind west-southwest around 3 mph, gusting to 24 mph, in the morning, becoming 7 mph, gusting to 24 mph, in the afternoon.
Tonight
 
Partly to mostly cloudy. Low 42°. Wind west around 4 mph, gusting to 17 mph.
Saturday
 
Partly to mostly cloudy in the morning, becoming cloudy in the afternoon. A chance of rain. High 55°. Wind west-northwest around 5 mph, gusting to 24 mph. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch.
Saturday night
 
Partly cloudy in the evening, becoming mostly clear after midnight. Patchy light fog after midnight. Low 37°. Wind west-northwest around 4 mph, gusting to 21 mph.
Sunday
 
Sunny. Patchy light fog in the morning. High 57°. Wind northwest around 2 mph, gusting to 19 mph, in the morning, becoming west-southwest in the afternoon.
Sunday night
 
Clear. Light to moderate fog after midnight. Low 36°. Wind south around 4 mph.
Monday
 
Sunny. Light to moderate fog in the morning. High 63°. Wind southwest around 6 mph, gusting to 24 mph, in the morning, becoming west-northwest in the afternoon.
Monday night
 
Mostly clear in the evening, becoming partly cloudy after midnight. Low 38°. Wind northwest around 2 mph in the evening, becoming north-northeast after midnight.
Tuesday
 
Partly cloudy in the morning, becoming sunny in the afternoon. Mild. High 65°. Wind south-southeast around 4 mph, gusting to 18 mph, in the morning, becoming 9 mph, gusting to 25 mph, in the afternoon.
Tuesday night
 
Mostly clear in the evening, becoming partly cloudy after midnight. Low 42°. Wind south around 9 mph, gusting to 18 mph.
Wednesday
 
Sunny. Warm. High 72°. Wind west-southwest around 9 mph, gusting to 28 mph, in the morning, becoming west-northwest in the afternoon.
Wednesday night
 
Clear. Low 36°. Wind north-northwest around 3 mph, gusting to 16 mph.
Thursday
 
Sunny in the morning, becoming partly to mostly sunny in the afternoon. Mild. High 65°. Wind southeast around 3 mph, gusting to 26 mph, in the morning, becoming 10 mph, gusting to 28 mph, in the afternoon.
Thursday night
 
Mostly clear in the evening, becoming partly cloudy after midnight. Low 43°. Wind southeast around 9 mph, gusting to 21 mph.

WXSIM forecast formatting script by Saratoga-Weather.org.

Powered by Davis Vantage Pro2  and   CumulusMX   v 4.5.2 (b4105)   MXUI Template v 2.2.6 by  Silver Acorn     Valid HTML5 USA Weather Finder Badge