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: Wednesday, 21-Oct-2026 04:00 pm

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

Low: 50°	High: 76°	Low: 51°	High: 76°	Low: 50°	High: 76°	Low: 48°	High: 75°

SSE→W calm	NE→E 1-19 mph	ESE calm	SSE 4-23 mph	SSE 4-15 mph	SSE 4-22 mph	SE 3 mph	SSE 2-18 mph
	UV: 5 Medium		UV: 4 Medium

Tonight	Fair. Low 50°. Wind south-southeast near calm in the evening, becoming west after midnight.
Thursday	Mostly sunny. Warm. High 76°. UV index up to 5. Wind northeast around 1 mph, gusting to 19 mph, in the morning, becoming east in the afternoon.
Thursday night	Fair. Low 51°. Wind east-southeast near calm.
Friday	Partly to mostly sunny in the morning, becoming sunny in the afternoon. Warm. High 76°. UV index up to 4. Wind south-southeast around 4 mph, gusting to 23 mph.
Friday night	Partly cloudy in the evening, becoming fair to partly cloudy after midnight. Low 50°. Wind south-southeast around 4 mph, gusting to 15 mph.
Saturday	Partly cloudy in the morning, becoming partly to mostly sunny in the afternoon. Warm. High 76°. Wind south-southeast around 4 mph, gusting to 22 mph.
Saturday night	Partly cloudy. Low 48°. Wind southeast around 3 mph.
Sunday	Partly cloudy. Warm. High 75°. Wind south-southeast 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 around 3 mph.
Monday	Partly cloudy. Warm. High 75°. Wind south-southwest around 4 mph, gusting to 21 mph.
Monday night	Partly cloudy. Low 49°. Wind south-southwest around 3 mph.
Tuesday	Mostly cloudy in the morning, becoming mostly cloudy to cloudy in the afternoon. High 67°. Wind west-southwest around 2 mph, gusting to 15 mph, in the morning, becoming north in the afternoon.
Tuesday night	Mostly cloudy in the evening, becoming partly to mostly cloudy after midnight. Low 48°. Wind south-southeast around 2 mph in the evening, becoming west-southwest after midnight.

WXSIM forecast formatting script by Saratoga-Weather.org.

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