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: Thursday, 11-Dec-2025 04:00 pm

Tonight Partly Cloudy	Friday Mostly Cloudy	Friday night Mostly Cloudy	Saturday Cloudy	Saturday night Mostly Cloudy	Sunday Sunny	Sunday night Clear	Monday Sunny

Low: 26°	High: 37°	Low: 26°	High: 30°	Low: 12°	High: 24°	Low: 14°	High: 41°
WCh: 21°	WCh: 21°			WCh: 4°		WCh: 4°
ESE→ENE 6-21 mph	N 6-19 mph	NNW 3-15 mph	NNW 6-25 mph	NNW 8-26 mph	NNW 8-24→4-23 mph	SE 3→6-18 mph	SSW 8-26 mph

Tonight	Mostly cloudy in the evening, becoming partly cloudy after midnight. Low 26°. Wind chill ranging from 21 to 26. Wind east-southeast around 6 mph, gusting to 21 mph, in the evening, becoming east-northeast after midnight.
Friday	Mostly cloudy in the morning, becoming mostly cloudy to cloudy in the afternoon. High 37°. Wind chill ranging from 21 to 31. Wind north around 6 mph, gusting to 19 mph.
Friday night	Mostly cloudy to cloudy. Low 26°. Wind north-northwest around 3 mph, gusting to 15 mph.
Saturday	Cloudy in the morning, becoming dense overcast in the afternoon. High 30°. Wind chill around 21. Wind north-northwest around 6 mph, gusting to 25 mph.
Saturday night	Mostly cloudy in the evening, becoming clear after midnight. Cold. Low 12°. Wind chill ranging from 4 to 20. Wind north-northwest around 8 mph, gusting to 26 mph.
Sunday	Sunny. Cold. High 24°. Wind north-northwest around 8 mph, gusting to 24 mph, in the morning, becoming 4 mph, gusting to 23 mph, in the afternoon.
Sunday night	Clear. Cold. Low 14°. Wind chill ranging from 4 to 18. Wind southeast around 3 mph in the evening, becoming 6 mph, gusting to 18 mph, after midnight.
Monday	Sunny. High 41°. Wind south-southwest around 8 mph, gusting to 26 mph.
Monday night	Clear. Low 20°. Wind southwest around 5 mph, gusting to 15 mph.
Tuesday	Sunny in the morning, becoming partly to mostly sunny in the afternoon. Relatively mild. High 54°. Wind southwest around 5 mph, gusting to 15 mph, in the morning, becoming 9 mph, gusting to 23 mph, in the afternoon.
Tuesday night	Partly to mostly cloudy in the evening, becoming mostly cloudy to cloudy after midnight. Low 35°. Wind southwest around 8 mph, gusting to 15 mph.
Wednesday	Cloudy in the morning, becoming mostly cloudy to cloudy in the afternoon. Relatively mild. High 54°. Wind south-southwest around 9 mph, gusting to 20 mph.
Wednesday night	Mostly cloudy to cloudy in the evening, becoming fair to partly cloudy after midnight. Patchy light fog after midnight. Relatively mild. Low 43°. Wind south-southwest around 11 mph, gusting to 18 mph.

WXSIM forecast formatting script by Saratoga-Weather.org.

Powered by Davis Vantage Pro2 and CumulusMX v 4.5.2 (b4105) MXUI Template v 2.2.6 by Silver Acorn Valid HTML5