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, 23-Oct-2026 04:00 pm

Tonight Partly Cloudy	Saturday Partly Cloudy	Saturday night Partly Cloudy	Sunday Partly Cloudy	Sunday night Mostly Cloudy	Monday Partly Cloudy	Monday night Partly Cloudy	Tuesday Partly Cloudy

Low: 48°	High: 76°	Low: 48°	High: 76°	Low: 48°	High: 76°	Low: 48°	High: 74°

SE 4-17 mph	SE 4-22 mph	SE 3 mph	S 2-19 mph	SE→S 3 mph	S 2-19 mph	SE 3 mph	S 3-22 mph
	UV: 4 Medium

Tonight	Fair to partly cloudy in the evening, becoming partly cloudy after midnight. Low 48°. Wind southeast around 4 mph, gusting to 17 mph.
Saturday	Partly to mostly sunny in the morning, becoming partly cloudy in the afternoon. Warm. High 76°. UV index up to 4. Wind southeast around 4 mph, gusting to 22 mph.
Saturday night	Partly cloudy. Low 48°. Wind southeast around 3 mph.
Sunday	Partly to mostly cloudy in the morning, becoming partly cloudy in the afternoon. Warm. High 76°. Wind south around 2 mph, gusting to 19 mph.
Sunday night	Partly to mostly cloudy. Low 48°. Wind southeast around 3 mph in the evening, becoming south after midnight.
Monday	Partly cloudy. Warm. High 76°. Wind south around 2 mph, gusting to 19 mph.
Monday night	Fair to partly cloudy in the evening, becoming partly cloudy after midnight. Low 48°. Wind southeast around 3 mph.
Tuesday	Partly cloudy in the morning, becoming partly to mostly cloudy in the afternoon. Warm. High 74°. Wind south around 3 mph, gusting to 22 mph.
Tuesday night	Partly to mostly cloudy in the evening, becoming partly cloudy after midnight. Low 48°. Wind south-southeast around 4 mph, gusting to 15 mph.
Wednesday	Sunny. Unusually warm. High 78°. Wind south around 6 mph, gusting to 24 mph.
Wednesday night	Fair to partly cloudy. Low 50°. Wind south-southwest around 3 mph in the evening, becoming west after midnight.
Thursday	Partly cloudy in the morning, becoming partly to mostly cloudy in the afternoon. Unusually warm. High 81°. Wind south-southwest around 6 mph, gusting to 23 mph.
Thursday night	Partly to mostly cloudy in the evening, becoming fair to partly cloudy after midnight. Low 53°. Wind south-southwest around 2 mph.

WXSIM forecast formatting script by Saratoga-Weather.org.

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