WXSIM Forecast for: O'Fallon
Issued by: OFallonweather.com
Updated: Saturday, 24-May-2025 04:00 pm
 
Tonight

Mostly Cloudy
Mostly Cloudy
Sunday

Cloudy
Cloudy
Sunday
night
Mostly Cloudy
Mostly Cloudy
Monday

Chance rain
Chance rain
Monday
night
Mostly Cloudy
Mostly Cloudy
Tuesday

Chance rain
Chance rain
Tuesday
night
Chance rain
Chance rain
Wednesday

Fog a.m.
Fog a.m.
<.1 in. <.1 in. .1 in. <.1 in. <.25 in. .1 in.
Low: 56° High: 72° Low: 57° High: 68° Low: 55° High: 68° Low: 53° High: 72°
               
E
5-25
mph
E
7-26
mph
E
8-24
mph
E
10-27
mph
E
8-23
mph
E→NNE
5-22
mph
NNW
7-17
mph
WNW
9-27
mph
UV: 5
 Medium 
UV: 5
 Medium 
UV: 4
 Medium 
UV: 8
 Very High 

 

Tonight
 
Partly to mostly cloudy. Relatively cool. Low 56°. Wind east around 5 mph, gusting to 25 mph.
Sunday
 
Cloudy in the morning, becoming dense overcast in the afternoon. A slight chance of rain. High 72°. UV index up to 5. Wind east around 7 mph, gusting to 26 mph. Chance of precipitation 20 percent. Precipitation mostly less than a tenth of an inch.
Sunday night
 
Mostly cloudy in the evening, becoming mostly cloudy to cloudy after midnight. A slight chance of rain. Relatively cool. Low 57°. Wind east around 8 mph, gusting to 24 mph. Chance of precipitation 20 percent. Precipitation mostly less than a tenth of an inch.
Monday
 
Mostly cloudy to cloudy in the morning, becoming cloudy in the afternoon. A slight chance of rain in the morning, then a chance of rain in the afternoon. Cool. High 68°. UV index up to 5. Wind east around 10 mph, gusting to 27 mph. Chance of precipitation 40 percent. Precipitation mostly around a tenth of an inch.
Monday night
 
Mostly cloudy to cloudy in the evening, becoming dense overcast after midnight. A chance of rain. Precipitation showery or intermittent. Relatively cool. Low 55°. Wind east around 8 mph, gusting to 23 mph. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch.
Tuesday
 
Dense overcast. A chance of rain. Precipitation showery or intermittent. Cool. High 68°. UV index up to 4. Wind east around 5 mph, gusting to 22 mph, in the morning, becoming north-northeast in the afternoon. Chance of precipitation 50 percent. Precipitation mostly less than a quarter of an inch.
Tuesday night
 
Mostly cloudy to cloudy in the evening, becoming cloudy after midnight. Patchy light fog. A chance of rain. Cool. Low 53°. Wind north-northwest around 7 mph, gusting to 17 mph. Chance of precipitation 50 percent. Precipitation mostly around a tenth of an inch.
Wednesday
 
Mostly cloudy in the morning, becoming partly cloudy in the afternoon. Patchy light fog in the morning. High 72°. UV index up to 8. Wind west-northwest around 9 mph, gusting to 27 mph.
Wednesday night
 
Fair. Cool. Low 50°. Wind west-northwest around 4 mph, gusting to 24 mph.
Thursday
 
Partly to mostly cloudy in the morning, becoming mostly cloudy in the afternoon. A chance of rain. High 72°. UV index up to 7. Wind west-northwest around 4 mph, gusting to 23 mph. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch.
Thursday night
 
Partly to mostly cloudy in the evening, becoming partly cloudy after midnight. Patchy light fog after midnight. A slight chance of rain. Relatively cool. Low 55°. Wind west around 4 mph, gusting to 18 mph. Chance of precipitation 20 percent. Precipitation mostly less than a tenth of an inch.
Friday
 
Partly cloudy in the morning, becoming mostly cloudy to cloudy in the afternoon. Moderate fog in the morning, then light to moderate fog in the afternoon. Rain likely. Cool. High 65°. UV index up to 6. Wind northwest around 5 mph. Chance of precipitation 70 percent. Precipitation mostly around 2 inches.
Friday night
 
Partly to mostly cloudy in the evening, becoming mostly cloudy after midnight. Cool. Low 53°. Wind north-northwest around 5 mph.

WXSIM forecast formatting script by Saratoga-Weather.org.

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