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, 19-Feb-2026 04:00 pm

Tonight Fog late	Friday Fog a.m.	Friday night Partly Cloudy	Saturday Partly Cloudy	Saturday night Partly Cloudy	Sunday Sunny	Sunday night Mostly Clear	Monday Sunny

Low: 35°	High: 45°	Low: 29°	High: 43°	Low: 23°	High: 34°	Low: 18°	High: 37°
				WCh: 15°	WCh: 12°	WCh: 9°
SW 13-30 mph	W 12-30 mph	W→N 5-23 mph	NNW 5-22→8-26 mph	NW 9-24 mph	NW 13-31 mph	NW 11-28 mph	NW 8-26 mph

Tonight	Mostly clear in the evening, becoming fair to partly cloudy after midnight. Patchy light fog after midnight. Breezy. Low 35°. Wind southwest around 13 mph, gusting to 30 mph.
Friday	Sunny. Patchy light fog in the morning. Breezy. High 45°. Wind west around 12 mph, gusting to 30 mph.
Friday night	Fair to partly cloudy in the evening, becoming partly cloudy after midnight. Low 29°. Wind west around 5 mph, gusting to 23 mph, in the evening, becoming north after midnight.
Saturday	Mostly cloudy to cloudy in the morning, becoming partly cloudy in the afternoon. High 43°. Wind north-northwest around 5 mph, gusting to 22 mph, in the morning, becoming 8 mph, gusting to 26 mph, in the afternoon.
Saturday night	Fair to partly cloudy in the evening, becoming clear after midnight. Low 23°. Wind chill ranging from 15 to 35. Wind northwest around 9 mph, gusting to 24 mph.
Sunday	Sunny. Breezy. High 34°. Wind chill ranging from 12 to 24. Wind northwest around 13 mph, gusting to 31 mph.
Sunday night	Clear in the evening, becoming mostly clear after midnight. Cold. Low 18°. Wind chill ranging from 9 to 23. Wind northwest around 11 mph, gusting to 28 mph.
Monday	Sunny. High 37°. Wind northwest around 8 mph, gusting to 26 mph.
Monday night	Clear in the evening, becoming fair after midnight. Cold. Low 20°. Wind northwest around 2 mph, gusting to 20 mph, in the evening, becoming south after midnight.
Tuesday	Partly cloudy. High 51°. Wind south around 6 mph, gusting to 22 mph, in the morning, becoming 12 mph, gusting to 27 mph, in the afternoon.
Tuesday night	Partly cloudy. Breezy. Low 32°. Wind chill ranging from 23 to 44. Wind south around 13 mph, gusting to 24 mph.
Wednesday	Cloudy in the morning, becoming partly to mostly cloudy in the afternoon. Relatively mild. High 54°. Wind southwest around 11 mph, gusting to 21 mph, in the morning, becoming west in the afternoon.
Wednesday night	Clear in the evening, becoming fair after midnight. Low 25°. Wind north-northwest around 7 mph, gusting to 19 mph, in the evening, becoming 4 mph after midnight.

WXSIM forecast formatting script by Saratoga-Weather.org.

Powered by Davis Vantage Pro2 and CumulusMX v 4.6.4 (b4128) MXUI Template v 2.2.6 by Silver Acorn Valid HTML5