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, 15-Oct-2026 04:00 pm

Tonight Chance rain	Friday Mostly Cloudy	Friday night Partly Cloudy	Saturday Mostly Sunny	Saturday night Clear	Sunday Sunny	Sunday night Clear	Monday Partly Cloudy
.1 in.	<.1 in.
Low: 55°	High: 57°	Low: 43°	High: 62°	Low: 42°	High: 68°	Low: 44°	High: 70°

WNW 11-28 mph	WNW 14-31 mph	NW 12-28→9-22 mph	N 4-24 mph	SE 2 mph	SSE 5-24 mph	SSE 3-18 mph	SSE 3-22 mph
			UV: 4 Medium		UV: 5 Medium

Tonight	Mostly cloudy to cloudy in the evening, becoming partly to mostly cloudy after midnight. Patchy light fog in the evening. A chance of rain in the evening, then a slight chance of rain after midnight. Breezy. Low 55°. Wind west-northwest around 11 mph, gusting to 28 mph. Chance of precipitation 40 percent. Precipitation mostly around a tenth of an inch.
Friday	Partly to mostly cloudy in the morning, becoming mostly cloudy in the afternoon. A slight chance of rain. Breezy. High 57°, but temperatures falling in the afternoon. Wind west-northwest around 14 mph, gusting to 31 mph. Chance of precipitation 20 percent. Precipitation mostly less than a tenth of an inch.
Friday night	Partly cloudy in the evening, becoming fair to partly cloudy after midnight. Low 43°. Wind northwest around 12 mph, gusting to 28 mph, in the evening, becoming 9 mph, gusting to 22 mph, after midnight.
Saturday	Mostly sunny in the morning, becoming sunny in the afternoon. High 62°. UV index up to 4. Wind north around 4 mph, gusting to 24 mph.
Saturday night	Clear. Low 42°. Wind southeast around 2 mph.
Sunday	Sunny. High 68°. UV index up to 5. Wind south-southeast around 5 mph, gusting to 24 mph.
Sunday night	Clear. Low 44°. Wind south-southeast around 3 mph, gusting to 18 mph.
Monday	Mostly sunny in the morning, becoming partly cloudy in the afternoon. High 70°. Wind south-southeast around 3 mph, gusting to 22 mph.
Monday night	Partly cloudy in the evening, becoming fair after midnight. Low 44°. Wind south-southeast near calm.
Tuesday	Mostly sunny in the morning, becoming partly to mostly sunny in the afternoon. Mild. High 71°. Wind south-southeast around 2 mph, gusting to 19 mph.
Tuesday night	Partly cloudy. Low 47°. Wind east-southeast around 2 mph.
Wednesday	Mostly sunny in the morning, becoming sunny in the afternoon. Warm. High 72°. Wind southeast around 4 mph, gusting to 20 mph.
Wednesday night	Fair in the evening, becoming mostly clear after midnight. Low 46°. Wind southeast around 3 mph.

WXSIM forecast formatting script by Saratoga-Weather.org.

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