WXSIM Forecast for: O'Fallon
Issued by: OFallonweather.com
Updated: Friday, 16-May-2025 04:00 pm
 
Tonight

Fog late
Fog late
Saturday

Fog a.m.
Fog a.m.
Saturday
night
Partly Cloudy
Partly Cloudy
Sunday

Mostly Sunny
Mostly Sunny
Sunday
night
Rain likely
Rain likely
Monday

Thunder storm
Thunder storm
Monday
night
Thunder storm
Thunder storm
Tuesday

Thunder storm
Thunder storm
.75 in. .75 in. 1.5 in. <.25 in.
Low: 56° High: 74° Low: 48° High: 81° Low: 59° High: 72° Low: 64° High: 76°
               
SW→W
11-24
mph
W
12-30
mph
W→NW
4-24
mph
NE→ESE
6-25
mph
ESE
8-23
mph
ESE
9-21
mph
ESE
9-18
mph
SSW
8-20
mph
UV: 8
 Very High 
UV: 10
 Very High 
UV: 5
 Medium 
UV: 7
 High 

 

Tonight
 
Clear. Patchy light fog after midnight. Relatively cool. Low 56°. Wind southwest around 11 mph, gusting to 24 mph, in the evening, becoming west after midnight.
Saturday
 
Mostly sunny in the morning, becoming partly cloudy in the afternoon. Patchy light fog in the morning. Breezy. High 74°. UV index up to 8. Wind west around 12 mph, gusting to 30 mph.
Saturday night
 
Fair to partly cloudy in the evening, becoming partly cloudy after midnight. Cool. Low 48°. Wind west around 4 mph, gusting to 24 mph, in the evening, becoming northwest after midnight.
Sunday
 
Sunny in the morning, becoming mostly sunny in the afternoon. High 81°. UV index up to 10. Wind northeast around 6 mph, gusting to 25 mph, in the morning, becoming east-southeast in the afternoon.
Sunday night
 
Partly cloudy in the evening, becoming cloudy after midnight. Patchy light fog after midnight. A chance of rain in the evening, then rain likely after midnight. Precipitation showery or intermittent. Low 59°. Wind east-southeast around 8 mph, gusting to 23 mph. Chance of precipitation 80 percent. Precipitation mostly between half an inch and one inch.
Monday
 
Cloudy. Patchy light fog in the morning. Rain. Scattered thundershowers possible. High 72°. UV index up to 5. Wind east-southeast around 9 mph, gusting to 21 mph. Chance of precipitation near 100 percent. Precipitation mostly between half an inch and one inch.
Monday night
 
Dense overcast in the evening, becoming mostly cloudy to cloudy after midnight. Light to moderate fog in the evening, then moderate fog after midnight. Rain. Scattered thunderstorms likely. Low 64°. Wind east-southeast around 9 mph, gusting to 18 mph. Chance of precipitation near 100 percent. Precipitation mostly between 1 and 2 inches.
Tuesday
 
Mostly cloudy. Moderate fog in the morning. A chance of rain in the morning, then rain likely in the afternoon. Scattered thunderstorms likely. High 76°. UV index up to 7. Wind south-southwest around 8 mph, gusting to 20 mph. Chance of precipitation 70 percent. Precipitation mostly less than a quarter of an inch.
Tuesday night
 
Partly to mostly cloudy in the evening, becoming mostly cloudy after midnight. Moderate fog. Rain likely in the evening, then a chance of rain after midnight. Scattered thunderstorms likely. Low 58°. Wind west-northwest around 6 mph, gusting to 18 mph. Chance of precipitation 70 percent. Precipitation mostly less than a quarter of an inch.
Wednesday
 
Cloudy in the morning, becoming mostly cloudy in the afternoon. Light to moderate fog in the morning. Rain likely. Cool. High 62°. UV index up to 6. Wind northwest around 11 mph, gusting to 27 mph. Chance of precipitation 70 percent. Precipitation mostly less than a quarter of an inch.
Wednesday night
 
Fair to partly cloudy in the evening, becoming fair after midnight. Light to moderate fog. A chance of rain. Cool. Low 50°. Wind northwest around 7 mph, gusting to 22 mph. Chance of precipitation 40 percent. Precipitation mostly around a tenth of an inch.
Thursday
 
Sunny. Light to moderate fog in the morning. High 70°. UV index up to 10. Wind northwest around 6 mph, gusting to 25 mph.
Thursday night
 
Clear. Cool. Low 49°. Wind north around 3 mph, gusting to 20 mph, in the evening, becoming south after midnight.

WXSIM forecast formatting script by Saratoga-Weather.org.

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