OFallon Missouri Weather

OFallon - Weather Data from OFallon, MO

Latitude: N 38° 50' 20" Longitude: W 90° 43' 42" Altitude: 532 ft

CST UTC Last station update CST

WXSIM Forecast for: O'Fallon
Issued by: OFallonweather.com

Updated: Thursday, 12-Nov-2026 05:00 am

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

High: 55°	Low: 36°	High: 49°	Low: 29°	High: 52°	Low: 29°	High: 54°	Low: 30°

NW 8-31→12-29 mph	NNW 7-25 mph	NNW 8-25 mph	NNW 3-21 mph	N 2-21 mph	ENE calm	ESE 1-18 mph	ESE calm

Today	Partly cloudy in the morning, becoming partly to mostly cloudy in the afternoon. High 55°. Wind northwest around 8 mph, gusting to 31 mph, in the morning, becoming 12 mph, gusting to 29 mph, in the afternoon.
Tonight	Fair to partly cloudy. Low 36°. Wind north-northwest around 7 mph, gusting to 25 mph.
Friday	Partly to mostly sunny in the morning, becoming partly cloudy in the afternoon. High 49°. Wind north-northwest around 8 mph, gusting to 25 mph.
Friday night	Fair in the evening, becoming mostly clear after midnight. Low 29°. Wind north-northwest around 3 mph, gusting to 21 mph.
Saturday	Sunny. High 52°. Wind north around 2 mph, gusting to 21 mph.
Saturday night	Clear. Low 29°. Wind east-northeast near calm.
Sunday	Partly to mostly sunny in the morning, becoming partly cloudy in the afternoon. High 54°. Wind east-southeast around 1 mph, gusting to 18 mph.
Sunday night	Partly cloudy in the evening, becoming clear after midnight. Low 30°. Wind east-southeast near calm.
Monday	Sunny. High 56°. Wind east-southeast around 1 mph, gusting to 19 mph.
Monday night	Clear. Low 30°. Wind southeast around 2 mph.
Tuesday	Sunny. Patchy light fog in the morning. Mild. High 59°. Wind south-southeast around 3 mph, gusting to 21 mph.
Tuesday night	Clear. Patchy light fog after midnight. Low 33°. Wind southeast around 4 mph.
Wednesday	Sunny. Patchy light fog in the morning. Mild. High 61°. Wind southeast around 6 mph, gusting to 17 mph, in the morning, becoming 10 mph, gusting to 24 mph, in the afternoon.
Wednesday night	Mostly clear in the evening, becoming mostly cloudy to cloudy after midnight. Low 40°. Wind southeast around 8 mph, gusting to 15 mph.

WXSIM forecast formatting script by Saratoga-Weather.org.

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