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: Saturday, 03-Oct-2026 05:00 am

Today Mostly Sunny	Tonight Partly Cloudy	Sunday Sunny	Sunday night Clear	Monday Sunny	Monday night Clear	Tuesday Sunny	Tuesday night Partly Cloudy

High: 74°	Low: 47°	High: 77°	Low: 46°	High: 74°	Low: 46°	High: 77°	Low: 47°

ENE 4-23 mph	E→NW calm	NNW 2-20→6-24 mph	N 5-17 mph	NE 4-24 mph	NE→ESE 3 mph	SE 4-23 mph	SE→SSW 4 mph
UV: 5 Medium		UV: 5 Medium		UV: 5 Medium		UV: 5 Medium

Today	Sunny in the morning, becoming partly to mostly sunny in the afternoon. High 74°. UV index up to 5. Wind east-northeast around 4 mph, gusting to 23 mph.
Tonight	Partly cloudy in the evening, becoming clear after midnight. Low 47°. Wind east near calm in the evening, becoming northwest after midnight.
Sunday	Sunny. Warm. High 77°. UV index up to 5. Wind north-northwest around 2 mph, gusting to 20 mph, in the morning, becoming 6 mph, gusting to 24 mph, in the afternoon.
Sunday night	Clear. Low 46°. Wind north around 5 mph, gusting to 17 mph.
Monday	Sunny. High 74°. UV index up to 5. Wind northeast around 4 mph, gusting to 24 mph.
Monday night	Clear. Low 46°. Wind northeast around 3 mph in the evening, becoming east-southeast after midnight.
Tuesday	Sunny. Warm. High 77°. UV index up to 5. Wind southeast around 4 mph, gusting to 23 mph.
Tuesday night	Mostly clear in the evening, becoming fair to partly cloudy after midnight. Low 47°. Wind southeast around 4 mph in the evening, becoming south-southwest after midnight.
Wednesday	Sunny in the morning, becoming partly to mostly sunny in the afternoon. Warm. High 78°. UV index up to 4. Wind west-southwest around 5 mph, gusting to 23 mph, in the morning, becoming west-northwest in the afternoon.
Wednesday night	Clear. Low 47°. Wind northwest around 3 mph.
Thursday	Sunny. Warm. High 78°. UV index up to 5. Wind northwest around 2 mph, gusting to 20 mph, in the morning, becoming northeast in the afternoon.
Thursday night	Clear. Low 47°. Wind east around 3 mph.
Friday	Sunny. Unusually hot. High 86°. UV index up to 5. Wind south-southwest around 4 mph, gusting to 15 mph, in the morning, becoming 7 mph, gusting to 23 mph, in the afternoon.
Friday night	Clear. Low 50°. Wind southwest around 3 mph.

WXSIM forecast formatting script by Saratoga-Weather.org.

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