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: Wednesday, 29-Jul-2026 04:00 pm

Tonight Fog late	Thursday Fog a.m.	Thursday night Fog late	Friday Thunder storm	Friday night Thunder storm	Saturday Thunder storm	Saturday night Fog late	Sunday Fog a.m.
	<.1 in.	<.1 in.	.25 in.	<.25 in.	<.1 in.
Low: 68°	High: 88°	Low: 69°	High: 84°	Low: 73°	High: 80°	Low: 67°	High: 84°
	Heat: 92°
NE 4-22 mph	E 4-23 mph	E→SE 6-21 mph	SE 7-21 mph	S→SW 8-19 mph	WNW→NNW 7-26→11-28 mph	N 8-26 mph	N 8-26 mph
	UV: 8 Very High		UV: 9 Very High				UV: 8 Very High

Tonight	Fair. Patchy light fog after midnight. Low 68°. Wind northeast around 4 mph, gusting to 22 mph.
Thursday	Partly to mostly sunny in the morning, becoming partly cloudy in the afternoon. Patchy light fog in the morning. A slight chance of rain. High 88°. Heat index up to 92°. UV index up to 8. Wind east around 4 mph, gusting to 23 mph. Chance of precipitation 20 percent. Precipitation mostly less than a tenth of an inch.
Thursday night	Partly cloudy in the evening, becoming partly to mostly cloudy after midnight. Patchy light fog after midnight. A slight chance of rain after midnight. Low 69°. Wind east around 6 mph, gusting to 21 mph, in the evening, becoming southeast after midnight. Chance of precipitation 20 percent. Precipitation mostly less than a tenth of an inch.
Friday	Cloudy in the morning, becoming partly to mostly cloudy in the afternoon. Patchy light fog in the morning. Rain likely. Scattered thundershowers possible. High 84°. UV index up to 9. Wind southeast around 7 mph, gusting to 21 mph. Chance of precipitation 60 percent. Precipitation mostly around a quarter of an inch.
Friday night	Partly to mostly cloudy. Patchy light fog. A chance of rain in the evening, then a slight chance of rain after midnight. Scattered thundershowers possible. Low 73°. Wind south around 8 mph, gusting to 19 mph, in the evening, becoming southwest after midnight. Chance of precipitation 60 percent. Precipitation mostly less than a quarter of an inch.
Saturday	Cloudy. A chance of rain. Scattered thundershowers possible. High 80°. Wind west-northwest around 7 mph, gusting to 26 mph, in the morning, becoming north-northwest around 11 mph, gusting to 28 mph, in the afternoon. Chance of precipitation 50 percent. Precipitation mostly less than a tenth of an inch.
Saturday night	Mostly cloudy in the evening, becoming partly to mostly cloudy after midnight. Patchy light fog after midnight. Low 67°. Wind north around 8 mph, gusting to 26 mph.
Sunday	Partly to mostly sunny in the morning, becoming sunny in the afternoon. Patchy light fog in the morning. High 84°. UV index up to 8. Wind north around 8 mph, gusting to 26 mph.
Sunday night	Clear. Patchy light fog after midnight. Relatively cool. Low 64°. Wind north-northeast around 4 mph, gusting to 22 mph.
Monday	Sunny. Patchy light fog in the morning. High 85°. UV index up to 8. Wind northeast around 4 mph, gusting to 23 mph.
Monday night	Clear. Patchy light fog after midnight. Relatively cool. Low 64°. Wind northeast around 3 mph, gusting to 19 mph.
Tuesday	Sunny in the morning, becoming mostly sunny in the afternoon. Patchy light fog in the morning. High 88°. UV index up to 9. Wind southeast around 3 mph, gusting to 22 mph, in the morning, becoming 6 mph, gusting to 23 mph, in the afternoon.
Tuesday night	Clear. Patchy light fog after midnight. Relatively cool. Low 67°. Wind southeast around 5 mph, gusting to 22 mph.

WXSIM forecast formatting script by Saratoga-Weather.org.

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