WXSIM Forecast for: O'Fallon
Issued by: OFallonweather.com
Updated: Wednesday, 10-Dec-2025 05:00 am
 
Today

Partly Cloudy
Partly Cloudy
Tonight

Mostly Cloudy
Mostly Cloudy
Thursday

Mostly Cloudy
Mostly Cloudy
Thursday
night
Mostly Cloudy
Mostly Cloudy
Friday

Partly Cloudy
Partly Cloudy
Friday
night
Mostly Cloudy
Mostly Cloudy
Saturday

Mostly Cloudy
Mostly Cloudy
Saturday
night
Snow
Snow
<.1 in.
.5 in.
High: 44° Low: 27° High: 38° Low: 28° High: 40° Low: 21° High: 27° Low: 11°
            WCh: 15° WCh: 2°
WNW
15-33
mph
WNW
7-24→4-18
mph
SW→SSE
calm→4-20
4
E
6-19
mph
N
8-24
mph
NW
5-19
mph
N
5-22
mph
N
8-24
mph

 

Today
 
Mostly cloudy in the morning, becoming partly cloudy in the afternoon. Breezy. High 44°, but temperatures falling in the afternoon. Wind west-northwest around 15 mph, gusting to 33 mph.
Tonight
 
Partly to mostly cloudy. Low 27°. Wind west-northwest around 7 mph, gusting to 24 mph, in the evening, becoming 4 mph, gusting to 18 mph, after midnight.
Thursday
 
Mostly cloudy to cloudy in the morning, becoming cloudy in the afternoon. High 38°. Wind southwest near calm in the morning, becoming south-southeast around 4 mph, gusting to 20 mph, in the afternoon.
Thursday night
 
Cloudy in the evening, becoming partly to mostly cloudy after midnight. Low 28°. Wind east around 6 mph, gusting to 19 mph.
Friday
 
Partly cloudy in the morning, becoming mostly cloudy in the afternoon. High 40°. Wind north around 8 mph, gusting to 24 mph.
Friday night
 
Mostly cloudy in the evening, becoming partly to mostly cloudy after midnight. Low 21°. Wind northwest around 5 mph, gusting to 19 mph.
Saturday
 
Mostly cloudy to cloudy in the morning, becoming cloudy in the afternoon. High 27°. Wind chill ranging from 15 to 20. Wind north around 5 mph, gusting to 22 mph.
Saturday night
 
Mostly cloudy in the evening, becoming fair to partly cloudy after midnight. A chance of snow. Cold. Low 11°. Wind chill ranging from 2 to 17. Wind north around 8 mph, gusting to 24 mph. Chance of precipitation 30 percent. Precipitation (liquid equivalent) mostly less than a tenth of an inch. Snow accumulation about half an inch.
Sunday
 
Sunny. High 26°. Wind chill ranging from 1 to 20. Wind north around 5 mph, gusting to 23 mph.
Sunday night
 
Clear. Cold. Low 14°. Wind chill ranging from 6 to 18. Wind east-northeast around 4 mph in the evening, becoming southeast after midnight.
Monday
 
Sunny in the morning, becoming partly to mostly sunny in the afternoon. High 44°. Wind southeast around 7 mph, gusting to 23 mph, in the morning, becoming south in the afternoon.
Monday night
 
Partly cloudy in the evening, becoming partly to mostly cloudy after midnight. Low 26°. Wind south around 5 mph, gusting to 17 mph.
Tuesday
 
Cloudy in the morning, becoming dense overcast in the afternoon. High 41°. Wind south around 6 mph.
Tuesday night
 
Cloudy in the evening, becoming dense overcast after midnight. A chance of rain. Low 34°. Wind south around 6 mph. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch.

WXSIM forecast formatting script by Saratoga-Weather.org.

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