WXSIM Forecast for: O'Fallon
Issued by: OFallonweather.com
Updated: Friday, 10-Apr-2026 05:00 am
 
Today

Sunny
Sunny		 Tonight

Mostly Clear
Mostly Clear		 Saturday

Sunny
Sunny		 Saturday
night
Clear
Clear		 Sunday

Sunny
Sunny		 Sunday
night
Mostly Clear
Mostly Clear		 Monday

Sunny
Sunny		 Monday
night
Clear
Clear
High: 89° Low: 57° High: 86° Low: 54° High: 86° Low: 55° High: 85° Low: 53°
               
SW→NW
6-29
mph
 NNE
2-26
mph
 E→SSE
4-27
mph
 SSE
6-23
mph
 SSE
9-29
mph
 SSW
8-25
mph
 SSW
9-31→14-32
mph
 SSW
10-28
mph
UV: 8
 Very High 		 UV: 8
 Very High 		 UV: 8
 Very High 		 UV: 8
 Very High 

 

Today
 
 Sunny. Exceptionally hot. High 89°. UV index up to 8. Wind southwest around 6 mph, gusting to 29 mph, in the morning, becoming northwest in the afternoon.
Tonight
 
 Mostly clear in the evening, becoming clear after midnight. Low 57°. Wind north-northeast around 2 mph, gusting to 26 mph.
Saturday
 
 Sunny. Unusually hot. High 86°. UV index up to 8. Wind east around 4 mph, gusting to 27 mph, in the morning, becoming south-southeast in the afternoon.
Saturday night
 
 Clear. Low 54°. Wind south-southeast around 6 mph, gusting to 23 mph.
Sunday
 
 Sunny. Unusually hot. High 86°. UV index up to 8. Wind south-southeast around 9 mph, gusting to 29 mph.
Sunday night
 
 Mostly clear in the evening, becoming clear after midnight. Low 55°. Wind south-southwest around 8 mph, gusting to 25 mph.
Monday
 
 Sunny. Breezy and unusually hot. High 85°. UV index up to 8. Wind south-southwest around 9 mph, gusting to 31 mph, in the morning, becoming 14 mph, gusting to 32 mph, in the afternoon.
Monday night
 
 Clear. Low 53°. Wind south-southwest around 10 mph, gusting to 28 mph.
Tuesday
 
 Sunny. Breezy and unusually hot. High 83°. UV index up to 8. Wind south-southwest around 12 mph, gusting to 31 mph.
Tuesday night
 
 Clear. Low 53°. Wind south-southwest around 10 mph, gusting to 28 mph.
Wednesday
 
 Sunny. Breezy and unusually hot. High 82°. UV index up to 8. Wind south-southwest around 12 mph, gusting to 32 mph.
Wednesday night
 
 Clear. Low 52°. Wind south-southwest around 10 mph, gusting to 28 mph.
Thursday
 
 Sunny. Breezy and unusually warm. High 81°. UV index up to 8. Wind south-southwest around 12 mph, gusting to 32 mph.
Thursday night
 
 Clear. Low 53°. Wind south-southwest around 11 mph, gusting to 29 mph.

WXSIM forecast formatting script by Saratoga-Weather.org.

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