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: Thursday, 22-Oct-2026 05:00 am

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

High: 76°	Low: 48°	High: 74°	Low: 49°	High: 76°	Low: 49°	High: 76°	Low: 49°

NNE→ESE 1-19 mph	ESE calm	ESE 4-22 mph	SE 4 mph	SSE 4-23 mph	SSE 3 mph	S 2-18 mph	SSE 2 mph
UV: 4 Medium		UV: 4 Medium

Today	Mostly sunny. Warm. High 76°. UV index up to 4. Wind north-northeast around 1 mph, gusting to 19 mph, in the morning, becoming east-southeast in the afternoon.
Tonight	Fair. Low 48°. Wind east-southeast near calm.
Friday	Partly to mostly sunny in the morning, becoming mostly sunny in the afternoon. Warm. High 74°. UV index up to 4. Wind east-southeast around 4 mph, gusting to 22 mph.
Friday night	Fair in the evening, becoming partly cloudy after midnight. Low 49°. Wind southeast around 4 mph.
Saturday	Partly to mostly sunny in the morning, becoming partly cloudy in the afternoon. Warm. High 76°. Wind south-southeast around 4 mph, gusting to 23 mph.
Saturday night	Partly cloudy. Low 49°. Wind south-southeast around 3 mph.
Sunday	Partly cloudy. Warm. High 76°. Wind south around 2 mph, gusting to 18 mph.
Sunday night	Partly cloudy in the evening, becoming partly to mostly cloudy after midnight. Low 49°. Wind south-southeast around 2 mph.
Monday	Partly cloudy. Warm. High 75°. Wind south around 2 mph, gusting to 16 mph.
Monday night	Partly to mostly cloudy in the evening, becoming partly cloudy after midnight. Low 49°. Wind south-southeast around 2 mph.
Tuesday	Partly to mostly cloudy in the morning, becoming partly cloudy in the afternoon. Warm. High 75°. Wind south-southeast around 2 mph, gusting to 20 mph.
Tuesday night	Fair to partly cloudy in the evening, becoming clear after midnight. Low 46°. Wind west-northwest around 3 mph.
Wednesday	Partly to mostly sunny in the morning, becoming sunny in the afternoon. Mild. High 71°. Wind west-northwest around 5 mph, gusting to 25 mph.
Wednesday night	Fair in the evening, becoming partly cloudy after midnight. Low 48°. Wind north-northwest around 2 mph in the evening, becoming east after midnight.

WXSIM forecast formatting script by Saratoga-Weather.org.

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