WXSIM Forecast for: O'Fallon
Issued by: OFallonweather.com
Updated: Monday, 27-Oct-2025 04:00 pm
 
Tonight

Cloudy
Cloudy
Tuesday

Cloudy
Cloudy
Tuesday
night
Rain likely
Rain likely
Wednesday

Chance rain
Chance rain
Wednesday
night
Fog
Fog
Thursday

Fog a.m.
Fog a.m.
Thursday
night
Fog late
Fog late
Friday

Fog a.m.
Fog a.m.
<.1 in. .5 in. <.25 in.
Low: 50° High: 56° Low: 49° High: 53° Low: 39° High: 56° Low: 37° High: 59°
               
ENE
2
mph
ESE
3-18
mph
E
6-18→10-22
mph
NE
12-27
mph
N
7-22
mph
NNW
7-25
mph
WNW
5-17
mph
W
6-24→10-27
mph

 

Tonight
 
Cloudy. Low 50°. Wind east-northeast around 2 mph.
Tuesday
 
Cloudy in the morning, becoming dense overcast in the afternoon. A chance of rain. High 56°. Wind east-southeast around 3 mph, gusting to 18 mph. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch.
Tuesday night
 
Dense overcast. Patchy light fog. A chance of rain in the evening, then rain likely after midnight. Low 49°. Wind east around 6 mph, gusting to 18 mph, in the evening, becoming 10 mph, gusting to 22 mph, after midnight. Chance of precipitation 80 percent. Precipitation mostly around half an inch.
Wednesday
 
Dense overcast in the morning, becoming mostly cloudy to cloudy in the afternoon. A chance of rain in the morning, then a slight chance of rain in the afternoon. Breezy. High 53°. Wind northeast around 12 mph, gusting to 27 mph. Chance of precipitation 60 percent. Precipitation mostly less than a quarter of an inch.
Wednesday night
 
Clear. Patchy light fog. Low 39°. Wind north around 7 mph, gusting to 22 mph.
Thursday
 
Partly to mostly sunny in the morning, becoming mostly sunny in the afternoon. Light to moderate fog in the morning. High 56°. Wind north-northwest around 7 mph, gusting to 25 mph.
Thursday night
 
Partly cloudy in the evening, becoming clear after midnight. Patchy light fog after midnight. Low 37°. Wind west-northwest around 5 mph, gusting to 17 mph.
Friday
 
Sunny. Patchy light fog in the morning. High 59°. Wind west around 6 mph, gusting to 24 mph, in the morning, becoming 10 mph, gusting to 27 mph, in the afternoon.
Friday night
 
Partly cloudy. Low 39°. Wind west around 4 mph, gusting to 18 mph.
Saturday
 
Partly cloudy in the morning, becoming mostly cloudy in the afternoon. High 53°. Wind west-northwest around 4 mph, gusting to 24 mph, in the morning, becoming 7 mph, gusting to 25 mph, in the afternoon.
Saturday night
 
Partly to mostly cloudy. Low 40°. Wind west-northwest around 3 mph, gusting to 18 mph.
Sunday
 
Partly to mostly sunny in the morning, becoming mostly sunny in the afternoon. High 59°. Wind west-southwest around 4 mph, gusting to 24 mph, in the morning, becoming 8 mph, gusting to 24 mph, in the afternoon.
Sunday night
 
Mostly clear in the evening, becoming partly cloudy after midnight. Low 40°. Wind south-southwest around 7 mph, gusting to 16 mph.

WXSIM forecast formatting script by Saratoga-Weather.org.

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