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: Friday, 02-Oct-2026 04:00 pm

Tonight Fog late	Saturday Fog a.m.	Saturday night Partly Cloudy	Sunday Sunny	Sunday night Clear	Monday Sunny	Monday night Clear	Tuesday Sunny

Low: 51°	High: 75°	Low: 49°	High: 77°	Low: 47°	High: 74°	Low: 46°	High: 76°

NE 6-21 mph	ENE 4-23 mph	E→NW calm	NW 4-23 mph	NNW 5-17 mph	N→NE 4-23 mph	NE→E 3 mph	ESE 4-23 mph
	UV: 5 Medium		UV: 5 Medium		UV: 5 Medium		UV: 5 Medium

Tonight	Fair. Patchy light fog after midnight. Low 51°. Wind northeast around 6 mph, gusting to 21 mph.
Saturday	Sunny in the morning, becoming partly cloudy in the afternoon. Patchy light fog in the morning. High 75°. UV index up to 5. Wind east-northeast around 4 mph, gusting to 23 mph.
Saturday night	Partly cloudy. Low 49°. Wind east near calm in the evening, becoming northwest after midnight.
Sunday	Sunny. Warm. High 77°. UV index up to 5. Wind northwest around 4 mph, gusting to 23 mph.
Sunday night	Clear. Low 47°. Wind north-northwest around 5 mph, gusting to 17 mph.
Monday	Sunny. High 74°. UV index up to 5. Wind north around 4 mph, gusting to 23 mph, in the morning, becoming northeast in the afternoon.
Monday night	Clear. Low 46°. Wind northeast around 3 mph in the evening, becoming east after midnight.
Tuesday	Sunny. Warm. High 76°. UV index up to 5. Wind east-southeast around 4 mph, gusting to 23 mph.
Tuesday night	Clear in the evening, becoming fair to partly cloudy after midnight. Low 48°. Wind southeast around 4 mph in the evening, becoming south after midnight.
Wednesday	Sunny. Warm. High 81°. UV index up to 5. Wind south-southwest around 4 mph, gusting to 22 mph, in the morning, becoming west-southwest in the afternoon.
Wednesday night	Clear. Low 49°. Wind north-northwest around 2 mph in the evening, becoming east after midnight.
Thursday	Sunny. Warm. High 82°. UV index up to 5. Wind southwest around 5 mph, gusting to 19 mph, in the morning, becoming 9 mph, gusting to 22 mph, in the afternoon.
Thursday night	Clear. Low 51°. Wind west around 5 mph in the evening, becoming north after midnight.

WXSIM forecast formatting script by Saratoga-Weather.org.

Powered by Davis Vantage Pro2 and CumulusMX v 4.6.4 (b4128) MXUI Template v 2.2.6 by Silver Acorn Valid HTML5