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, 16-Jan-2026 04:00 pm

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

Low: 23°	High: 28°	Low: 14°	High: 31°	Low: 15°	High: 24°	Low: 11°	High: 38°
WCh: 16°		WCh: 6°	WCh: 7°	WCh: 5°	WCh: 2°	WCh: 5°	WCh: 5°
W 10-25 mph	W 8-27→12-28 mph	W 8-26 mph	WSW 8-25 mph	WNW 8-22→12-23 mph	NW 9-27 mph	WNW 4-20 mph	SW 5-22→10-26 mph

Tonight	Mostly cloudy to cloudy in the evening, becoming fair after midnight. Low 23°. Wind chill ranging from 16 to 31. Wind west around 10 mph, gusting to 25 mph.
Saturday	Partly to mostly cloudy in the morning, becoming mostly cloudy in the afternoon. High 28°. Wind chill around 15. Wind west around 8 mph, gusting to 27 mph, in the morning, becoming 12 mph, gusting to 28 mph, in the afternoon.
Saturday night	Partly cloudy in the evening, becoming mostly clear after midnight. Low 14°. Wind chill ranging from 6 to 14. Wind west around 8 mph, gusting to 26 mph.
Sunday	Partly to mostly cloudy in the morning, becoming mostly cloudy in the afternoon. High 31°. Wind chill ranging from 7 to 22. Wind west-southwest around 8 mph, gusting to 25 mph.
Sunday night	Mostly clear. Cold. Low 15°. Wind chill ranging from 5 to 21. Wind west-northwest around 8 mph, gusting to 22 mph, in the evening, becoming 12 mph, gusting to 23 mph, after midnight.
Monday	Sunny in the morning, becoming mostly sunny in the afternoon. Cold. High 24°. Wind chill ranging from 2 to 14. Wind northwest around 9 mph, gusting to 27 mph.
Monday night	Clear. Cold. Low 11°. Wind chill ranging from 5 to 14. Wind west-northwest around 4 mph, gusting to 20 mph.
Tuesday	Sunny in the morning, becoming mostly sunny in the afternoon. High 38°. Wind chill ranging from 5 to 30. Wind southwest around 5 mph, gusting to 22 mph, in the morning, becoming 10 mph, gusting to 26 mph, in the afternoon.
Tuesday night	Clear in the evening, becoming mostly clear after midnight. Low 22°. Wind chill ranging from 13 to 28. Wind southwest around 10 mph, gusting to 21 mph.
Wednesday	Partly to mostly cloudy in the morning, becoming mostly cloudy in the afternoon. High 42°. Wind southwest around 7 mph, gusting to 22 mph, in the morning, becoming west in the afternoon.
Wednesday night	Partly to mostly cloudy in the evening, becoming fair after midnight. Low 20°. Wind north-northwest around 8 mph, gusting to 22 mph, in the evening, becoming 5 mph, gusting to 17 mph, after midnight.
Thursday	Partly to mostly sunny in the morning, becoming sunny in the afternoon. High 35°. Wind chill ranging from 15 to 28. Wind north-northwest around 6 mph, gusting to 23 mph.
Thursday night	Clear in the evening, becoming fair after midnight. Low 18°. Wind chill ranging from 12 to 28. Wind west-northwest around 3 mph, gusting to 17 mph, in the evening, becoming south after midnight.

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