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 05:00 am

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

High: 78°	Low: 52°	High: 79°	Low: 51°	High: 79°	Low: 50°	High: 77°	Low: 49°

SE 4-23 mph	SE 4 mph	SE 4-23 mph	SE 3-16 mph	SSE 2-20 mph	SSE 2 mph	SSW 2-19 mph	SE→S 3 mph
UV: 5 Medium		UV: 4 Medium

Today	Mostly sunny. Unusually warm. High 78°. UV index up to 5. Wind southeast around 4 mph, gusting to 23 mph.
Tonight	Fair to partly cloudy in the evening, becoming partly cloudy after midnight. Low 52°. Wind southeast around 4 mph.
Saturday	Partly cloudy. Unusually warm. High 79°. UV index up to 4. Wind southeast around 4 mph, gusting to 23 mph.
Saturday night	Partly cloudy. Low 51°. Wind southeast around 3 mph, gusting to 16 mph.
Sunday	Partly cloudy. Unusually warm. High 79°. Wind south-southeast around 2 mph, gusting to 20 mph.
Sunday night	Partly cloudy in the evening, becoming partly to mostly cloudy after midnight. Low 50°. Wind south-southeast around 2 mph.
Monday	Partly cloudy. Unusually warm. High 77°. Wind south-southwest around 2 mph, gusting to 19 mph.
Monday night	Partly cloudy. Low 49°. Wind southeast around 3 mph in the evening, becoming south after midnight.
Tuesday	Partly cloudy in the morning, becoming partly to mostly cloudy in the afternoon. Warm. High 75°. Wind south around 3 mph, gusting to 21 mph.
Tuesday night	Partly cloudy in the evening, becoming fair after midnight. Low 47°. Wind southeast around 3 mph in the evening, becoming south after midnight.
Wednesday	Sunny. Warm. High 76°. Wind south around 4 mph, gusting to 19 mph, in the morning, becoming 8 mph, gusting to 25 mph, in the afternoon.
Wednesday night	Mostly clear in the evening, becoming partly cloudy after midnight. Low 49°. Wind south around 5 mph.
Thursday	Partly to mostly cloudy in the morning, becoming partly to mostly sunny in the afternoon. Unusually warm. High 78°. Wind south around 7 mph, gusting to 19 mph, in the morning, becoming 10 mph, gusting to 25 mph, in the afternoon.
Thursday night	Partly to mostly cloudy in the evening, becoming cloudy after midnight. Mild. Low 58°. Wind south around 6 mph, gusting to 16 mph.

WXSIM forecast formatting script by Saratoga-Weather.org.

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