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 04:00 pm

Tonight Mostly Cloudy	Thursday Rain likely	Thursday night Rain likely	Friday Fog a.m.	Friday night Fog late	Saturday Fog a.m.	Saturday night Fog late	Sunday Fog a.m.
	.35 in.	1.0 in.
Low: 70°	High: 83°	Low: 65°	High: 74°	Low: 51°	High: 72°	Low: 52°	High: 74°

SSE 7-20 mph	SSW 7-22 mph	NW→N 4→8-22 mph	N 9-27 mph	NE 6-22 mph	ENE 5-22 mph	ENE 2-15 mph	N 3-22 mph
	UV: 4 Medium		UV: 6 High		UV: 6 High		UV: 5 Medium

Tonight	Mostly cloudy in the evening, becoming partly to mostly cloudy after midnight. Warm. Low 70°. Wind south-southeast around 7 mph, gusting to 20 mph.
Thursday	Mostly cloudy in the morning, becoming cloudy in the afternoon. Patchy light fog in the afternoon. A slight chance of rain in the morning, then rain likely in the afternoon. Warm. High 83°. UV index up to 4. Wind south-southwest around 7 mph, gusting to 22 mph. Chance of precipitation 60 percent. Precipitation mostly between a quarter and half an inch.
Thursday night	Dense overcast. Light to moderate fog in the evening, then patchy light fog after midnight. Rain likely. Mild. Low 65°. Wind northwest around 4 mph in the evening, becoming north around 8 mph, gusting to 22 mph, after midnight. Chance of precipitation 80 percent. Precipitation mostly around an inch.
Friday	Mostly cloudy in the morning, becoming sunny in the afternoon. Patchy light fog in the morning. High 74°. UV index up to 6. Wind north around 9 mph, gusting to 27 mph.
Friday night	Clear. Light to moderate fog after midnight. Low 51°. Wind northeast around 6 mph, gusting to 22 mph.
Saturday	Sunny. Light to moderate fog in the morning. High 72°. UV index up to 6. Wind east-northeast around 5 mph, gusting to 22 mph.
Saturday night	Partly cloudy. Patchy light fog after midnight. Low 52°. Wind east-northeast around 2 mph, gusting to 15 mph.
Sunday	Sunny. Patchy light fog in the morning. High 74°. UV index up to 5. Wind north around 3 mph, gusting to 22 mph.
Sunday night	Clear. Patchy light fog in the evening, then moderate fog after midnight. Low 52°. Wind north around 5 mph.
Monday	Sunny. Moderate fog in the morning. High 72°. UV index up to 5. Wind north-northeast around 5 mph, gusting to 23 mph.
Monday night	Clear in the evening, becoming mostly clear after midnight. Patchy light fog after midnight. Low 49°. Wind northeast around 3 mph in the evening, becoming east after midnight.
Tuesday	Mostly sunny. Patchy light fog in the morning. High 71°. UV index up to 5. Wind east around 6 mph, gusting to 25 mph, in the morning, becoming southeast in the afternoon.
Tuesday night	Mostly cloudy to cloudy in the evening, becoming partly to mostly cloudy after midnight. Low 52°. Wind south-southeast around 5 mph, gusting to 18 mph.

WXSIM forecast formatting script by Saratoga-Weather.org.

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