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: Tuesday, 20-Oct-2026 04:00 pm

Tonight Partly Cloudy	Wednesday Mostly Sunny	Wednesday night Partly Cloudy	Thursday Mostly Sunny	Thursday night Clear	Friday Sunny	Friday night Partly Cloudy	Saturday Partly Cloudy

Low: 49°	High: 74°	Low: 49°	High: 74°	Low: 47°	High: 74°	Low: 50°	High: 75°

ESE→SSE 2-17 mph	SSE→WSW 2-20 mph	ESE→WSW calm	E 1-18 mph	SE 2 mph	SE 4-23 mph	SE 4 mph	SSE 4-22 mph
	UV: 5 Medium		UV: 4 Medium		UV: 4 Medium

Tonight	Fair in the evening, becoming partly cloudy after midnight. Low 49°. Wind east-southeast around 2 mph, gusting to 17 mph, in the evening, becoming south-southeast after midnight.
Wednesday	Partly to mostly sunny in the morning, becoming mostly sunny in the afternoon. Warm. High 74°. UV index up to 5. Wind south-southeast around 2 mph, gusting to 20 mph, in the morning, becoming west-southwest in the afternoon.
Wednesday night	Fair in the evening, becoming fair to partly cloudy after midnight. Low 49°. Wind east-southeast near calm in the evening, becoming west-southwest after midnight.
Thursday	Mostly sunny in the morning, becoming sunny in the afternoon. Warm. High 74°. UV index up to 4. Wind east around 1 mph, gusting to 18 mph.
Thursday night	Clear. Low 47°. Wind southeast around 2 mph.
Friday	Sunny. Warm. High 74°. UV index up to 4. Wind southeast around 4 mph, gusting to 23 mph.
Friday night	Fair in the evening, becoming partly cloudy after midnight. Low 50°. Wind southeast around 4 mph.
Saturday	Partly cloudy. Warm. High 75°. Wind south-southeast around 4 mph, gusting to 22 mph.
Saturday night	Partly cloudy. Low 50°. Wind south-southeast around 4 mph.
Sunday	Partly cloudy. Warm. High 75°. Wind south-southwest around 3 mph, gusting to 17 mph.
Sunday night	Partly cloudy. Low 49°. Wind south around 4 mph.
Monday	Partly cloudy. Warm. High 75°. Wind south-southwest around 5 mph, gusting to 21 mph.
Monday night	Partly to mostly cloudy in the evening, becoming cloudy after midnight. Low 52°. Wind west-southwest around 2 mph in the evening, becoming northwest around 5 mph after midnight.

WXSIM forecast formatting script by Saratoga-Weather.org.

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