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 05:00 am

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

High: 76°	Low: 50°	High: 76°	Low: 51°	High: 78°	Low: 50°	High: 75°	Low: 48°

N 9-28 mph	NNE 6-24 mph	ENE 5-25 mph	E→NNW 1-17 mph	NNW 3-24→8-25 mph	NNW 5-19 mph	NE 5-25 mph	NE→E 3-17 mph
UV: 6 High		UV: 5 Medium		UV: 5 Medium		UV: 5 Medium

Today	Mostly cloudy in the morning, becoming sunny in the afternoon. Warm. High 76°. UV index up to 6. Wind north around 9 mph, gusting to 28 mph.
Tonight	Clear. Low 50°. Wind north-northeast around 6 mph, gusting to 24 mph.
Saturday	Sunny in the morning, becoming partly cloudy in the afternoon. Warm. High 76°. UV index up to 5. Wind east-northeast around 5 mph, gusting to 25 mph.
Saturday night	Partly cloudy. Low 51°. Wind east around 1 mph, gusting to 17 mph, in the evening, becoming north-northwest after midnight.
Sunday	Sunny. Warm. High 78°. UV index up to 5. Wind north-northwest around 3 mph, gusting to 24 mph, in the morning, becoming 8 mph, gusting to 25 mph, in the afternoon.
Sunday night	Clear. Low 50°. Wind north-northwest around 5 mph, gusting to 19 mph.
Monday	Sunny. Warm. High 75°. UV index up to 5. Wind northeast around 5 mph, gusting to 25 mph.
Monday night	Clear. Low 48°. Wind northeast around 3 mph, gusting to 17 mph, in the evening, becoming east after midnight.
Tuesday	Sunny. Warm. High 78°. UV index up to 5. Wind southeast around 5 mph, gusting to 25 mph.
Tuesday night	Clear in the evening, becoming fair after midnight. Low 50°. Wind south-southeast around 4 mph, gusting to 16 mph.
Wednesday	Sunny. Warm. High 81°. UV index up to 5. Wind southwest around 4 mph, gusting to 24 mph.
Wednesday night	Clear. Patchy light fog after midnight. Low 52°. Wind southwest around 3 mph.
Thursday	Sunny. Patchy light fog in the morning. Warm. High 82°. UV index up to 5. Wind southwest around 4 mph, gusting to 18 mph, in the morning, becoming 7 mph, gusting to 22 mph, in the afternoon.
Thursday night	Clear. Patchy light fog after midnight. Low 53°. Wind southwest around 3 mph.

WXSIM forecast formatting script by Saratoga-Weather.org.

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