OFallon Missouri Weather

OFallon - Weather Data from OFallon, MO

Latitude: N 38° 50' 20" Longitude: W 90° 43' 42" Altitude: 532 ft

CDT UTC Last station update CDT

WXSIM Forecast for: O'Fallon
Issued by: OFallonweather.com

Updated: Sunday, 18-May-2025 05:00 am

Today Mostly Sunny	Tonight Rain likely	Monday Thunder storm	Monday night Thunder storm	Tuesday Thunder storm	Tuesday night Fog late	Wednesday Fog a.m.	Wednesday night Mostly Cloudy
<.1 in.	.5 in.	1.0 in.	.75 in.	.1 in.
High: 81°	Low: 58°	High: 72°	Low: 64°	High: 80°	Low: 55°	High: 62°	Low: 48°

NE→ESE 5-25 mph	ESE 5-22 mph	ESE 10-21 mph	SE 10-18 mph	SSW 11-29 mph	W 10-29 mph	W 14-31 mph	NW 8-28 mph
UV: 10 Very High		UV: 5 Medium		UV: 10 Very High		UV: 5 Medium

Today	Partly to mostly sunny in the morning, becoming sunny in the afternoon. A slight chance of rain. High 81°. UV index up to 10. Wind northeast around 5 mph, gusting to 25 mph, in the morning, becoming east-southeast in the afternoon. Chance of precipitation 20 percent. Precipitation mostly less than a tenth of an inch.
Tonight	Partly cloudy in the evening, becoming mostly cloudy to cloudy after midnight. Light to moderate fog after midnight. A slight chance of rain in the evening, then rain likely after midnight. Low 58°. Wind east-southeast around 5 mph, gusting to 22 mph. Chance of precipitation 70 percent. Precipitation mostly around half an inch.
Monday	Cloudy. Light to moderate fog in the morning. Rain likely in the morning, then a chance of rain in the afternoon. Scattered thundershowers possible. High 72°. UV index up to 5. Wind east-southeast around 10 mph, gusting to 21 mph. Chance of precipitation 80 percent. Precipitation mostly around an inch.
Monday night	Cloudy in the evening, becoming mostly cloudy after midnight. Patchy light fog in the evening, then moderate fog after midnight. Rain likely. Scattered thundershowers possible. Low 64°. Wind southeast around 10 mph, gusting to 18 mph. Chance of precipitation 80 percent. Precipitation mostly between half an inch and one inch.
Tuesday	Partly cloudy in the morning, becoming mostly sunny in the afternoon. Moderate fog in the morning. A chance of rain in the morning, then a slight chance of rain in the afternoon. Scattered thunderstorms likely. High 80°. UV index up to 10. Wind south-southwest around 11 mph, gusting to 29 mph. Chance of precipitation 50 percent. Precipitation mostly around a tenth of an inch.
Tuesday night	Fair to partly cloudy. Patchy light fog after midnight. Cool. Low 55°. Wind west around 10 mph, gusting to 29 mph.
Wednesday	Mostly cloudy to cloudy. Patchy light fog in the morning. Breezy and cool. High 62°. UV index up to 5. Wind west around 14 mph, gusting to 31 mph.
Wednesday night	Mostly cloudy in the evening, becoming fair after midnight. Unusually cool. Low 48°. Wind northwest around 8 mph, gusting to 28 mph.
Thursday	Mostly cloudy. Cool. High 62°. UV index up to 6. Wind northwest around 10 mph, gusting to 27 mph.
Thursday night	Fair to partly cloudy in the evening, becoming clear after midnight. Unusually cool. Low 46°. Wind northwest around 5 mph, gusting to 22 mph.
Friday	Sunny in the morning, becoming partly to mostly sunny in the afternoon. High 70°. UV index up to 10. Wind west around 7 mph, gusting to 27 mph, in the morning, becoming northwest in the afternoon.
Friday night	Clear in the evening, becoming mostly clear after midnight. Cool. Low 48°. Wind west-northwest around 3 mph, gusting to 20 mph, in the evening, becoming southwest after midnight.
Saturday	Sunny in the morning, becoming mostly cloudy to cloudy in the afternoon. High 75°. UV index up to 8. Wind southeast around 5 mph, gusting to 23 mph.
Saturday night	Fair to partly cloudy in the evening, becoming partly to mostly cloudy after midnight. Cool. Low 54°. Wind southeast around 6 mph, gusting to 20 mph.

WXSIM forecast formatting script by Saratoga-Weather.org.

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