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, 30-Sep-2026 05:00 am

Today Mostly Cloudy	Tonight Mostly Cloudy	Thursday Mostly Cloudy	Thursday night Rain likely	Friday Chance rain	Friday night Fog late	Saturday Fog a.m.	Saturday night Fog late
		<.1 in.	.5 in.	.1 in.
High: 92°	Low: 72°	High: 87°	Low: 66°	High: 75°	Low: 52°	High: 74°	Low: 49°

S 5-25→8-26 mph	S 6-17 mph	S 7-24 mph	N 4-17 mph	NNE 9-27 mph	NNE 6-23 mph	NE→E 5-23 mph	E 2-16 mph
UV: 5 Medium				UV: 6 High		UV: 6 High

Today	Partly to mostly cloudy. Very hot. High 92°. UV index up to 5. Wind south around 5 mph, gusting to 25 mph, in the morning, becoming 8 mph, gusting to 26 mph, in the afternoon.
Tonight	Mostly cloudy to cloudy. Unusually warm. Low 72°. Wind south around 6 mph, gusting to 17 mph.
Thursday	Mostly cloudy to cloudy in the morning, becoming cloudy in the afternoon. A chance of rain. Unusually hot. High 87°. Wind south around 7 mph, gusting to 24 mph. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch.
Thursday night	Dense overcast. Light to moderate fog after midnight. A chance of rain in the evening, then rain likely after midnight. Warm. Low 66°. Wind north around 4 mph, gusting to 17 mph. Chance of precipitation 80 percent. Precipitation mostly around half an inch.
Friday	Mostly cloudy in the morning, becoming sunny in the afternoon. Patchy light fog in the morning. A chance of rain. High 75°. UV index up to 6. Wind north-northeast around 9 mph, gusting to 27 mph. Chance of precipitation 40 percent. Precipitation mostly around a tenth of an inch.
Friday night	Clear. Patchy light fog after midnight. Low 52°. Wind north-northeast around 6 mph, gusting to 23 mph.
Saturday	Sunny. Patchy light fog in the morning. High 74°. UV index up to 6. Wind northeast around 5 mph, gusting to 23 mph, in the morning, becoming east in the afternoon.
Saturday night	Clear. Patchy light fog after midnight. Low 49°. Wind east around 2 mph, gusting to 16 mph.
Sunday	Sunny. Patchy light fog in the morning. Warm. High 76°. UV index up to 5. Wind north around 2 mph, gusting to 20 mph.
Sunday night	Mostly clear in the evening, becoming clear after midnight. Patchy light fog after midnight. Low 51°. Wind north around 3 mph.
Monday	Sunny. Light to moderate fog in the morning. High 73°. UV index up to 5. Wind north around 6 mph, gusting to 24 mph.
Monday night	Clear. Patchy light fog after midnight. Low 48°. Wind east-northeast around 5 mph, gusting to 16 mph.
Tuesday	Sunny in the morning, becoming partly to mostly sunny in the afternoon. Patchy light fog in the morning. High 72°. UV index up to 5. Wind east-southeast around 7 mph, gusting to 27 mph.
Tuesday night	Partly cloudy in the evening, becoming partly to mostly cloudy after midnight. Low 50°. Wind southeast around 4 mph, gusting to 18 mph.

WXSIM forecast formatting script by Saratoga-Weather.org.

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