OFallon Missouri Weather

OFallon - Weather Data from OFallon, MO

Latitude: N 38° 50' 20" Longitude: W 90° 43' 42" Altitude: 532 ft

CST UTC Last station update CST

WXSIM Forecast for: O'Fallon
Issued by: OFallonweather.com

Updated: Friday, 19-Dec-2025 05:00 am

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

High: 41°	Low: 24°	High: 52°	Low: 20°	High: 43°	Low: 24°	High: 49°	Low: 32°
	WCh: 15°				WCh: 18°
W 10-22→6-23 mph	SSE 6→10 mph	S→WNW 9-24 mph	NW 5 mph	NE 4 mph	E→SE 5 mph	SE 6 mph	SSE→SSW 6 mph

Today	Partly to mostly sunny. High 41°. Wind west around 10 mph, gusting to 22 mph, in the morning, becoming 6 mph, gusting to 23 mph, in the afternoon.
Tonight	Partly cloudy. Low 24°. Wind chill ranging from 15 to 33. Wind south-southeast around 6 mph in the evening, becoming 10 mph after midnight.
Saturday	Partly to mostly sunny in the morning, becoming partly cloudy in the afternoon. Relatively mild. High 52°. Wind south around 9 mph, gusting to 24 mph, in the morning, becoming west-northwest in the afternoon.
Saturday night	Partly cloudy. Low 20°. Wind northwest around 5 mph.
Sunday	Partly to mostly sunny in the morning, becoming mostly sunny in the afternoon. High 43°. Wind northeast around 4 mph.
Sunday night	Partly cloudy. Low 24°. Wind chill ranging from 18 to 32. Wind east around 5 mph in the evening, becoming southeast after midnight.
Monday	Partly cloudy in the morning, becoming mostly cloudy in the afternoon. Relatively mild. High 49°. Wind southeast around 6 mph.
Monday night	Fair to partly cloudy in the evening, becoming partly cloudy after midnight. Low 32°. Wind south-southeast around 6 mph in the evening, becoming south-southwest after midnight.
Tuesday	Partly to mostly cloudy. A chance of rain. Unusually mild. High 59°. Wind south-southwest around 3 mph. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch.
Tuesday night	Mostly cloudy in the evening, becoming cloudy after midnight. Patchy light fog after midnight. A chance of rain in the evening, then a slight chance of rain after midnight. Relatively mild. Low 45°. Wind south-southeast near calm. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch.
Wednesday	Mostly cloudy to cloudy. Patchy light fog in the morning. Unusually mild. High 61°. Wind south around 5 mph.
Wednesday night	Mostly cloudy to cloudy in the evening, becoming mostly cloudy after midnight. Patchy light fog. A slight chance of rain. Relatively mild. Low 50°. Wind south around 4 mph. Chance of precipitation 20 percent. Precipitation mostly less than a tenth of an inch.
Thursday	Partly cloudy in the morning, becoming partly to mostly cloudy in the afternoon. Patchy light fog in the morning. Breezy and exceptionally warm. High 70°. Wind south-southwest around 10 mph, gusting to 21 mph, in the morning, becoming 15 mph, gusting to 27 mph, in the afternoon.
Thursday night	Mostly cloudy to cloudy in the evening, becoming partly to mostly cloudy after midnight. Patchy light fog after midnight. Unusually mild. Low 51°. Wind southwest around 11 mph, gusting to 21 mph, in the evening, becoming west-northwest around 3 mph after midnight.

WXSIM forecast formatting script by Saratoga-Weather.org.

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