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, 26-Dec-2025 04:00 pm

Tonight Fog late	Saturday Fog a.m.	Saturday night Mostly Cloudy	Sunday Chance rain	Sunday night Rain and Snow	Monday Partly Cloudy	Monday night Clear	Tuesday Mostly Sunny
			<.25 in.	<.1 in.
Low: 40°	High: 67°	Low: 56°	High: 67°	Low: 21°	High: 23°	Low: 13°	High: 36°
				WCh: 12°	WCh: 6°	WCh: 1°	WCh: 3°
N→ENE 3 mph	ESE 5→8-20 mph	SSE 7-16 mph	S→WSW 8-18→13-27 mph	WNW 17-33 mph	WNW 15-32 mph	WNW 11-23 mph	WNW 7-23 mph

Tonight	Fair in the evening, becoming partly cloudy after midnight. Patchy light fog in the evening, then light to moderate fog after midnight. Relatively mild. Low 40°. Wind north around 3 mph in the evening, becoming east-northeast after midnight.
Saturday	Partly cloudy. Moderate fog in the morning. Unusually mild. High 67°. Wind east-southeast around 5 mph in the morning, becoming 8 mph, gusting to 20 mph, in the afternoon.
Saturday night	Mostly cloudy in the evening, becoming cloudy after midnight. Unusually mild. Low 56°. Wind south-southeast around 7 mph, gusting to 16 mph.
Sunday	Cloudy. A chance of rain. Unusually mild. High 67°. Wind south around 8 mph, gusting to 18 mph, in the morning, becoming west-southwest around 13 mph, gusting to 27 mph, in the afternoon. Chance of precipitation 50 percent. Precipitation mostly less than a quarter of an inch.
Sunday night	Cloudy in the evening, becoming partly cloudy after midnight. A chance of rain in the evening, then a slight chance of a mix of rain and snow after midnight. Windy. Low 21°. Wind chill ranging from 12 to 48. Wind west-northwest around 17 mph, gusting to 33 mph. Chance of precipitation 30 percent. Precipitation (liquid equivalent) mostly less than a tenth of an inch. No snow accumulation expected.
Monday	Partly to mostly cloudy in the morning, becoming partly cloudy in the afternoon. Breezy and cold. High 23°, but temperatures falling in the afternoon. Wind chill ranging from 6 to 11. Wind west-northwest around 15 mph, gusting to 32 mph.
Monday night	Clear. Cold. Low 13°. Wind chill ranging from 1 to 7. Wind west-northwest around 11 mph, gusting to 23 mph.
Tuesday	Sunny in the morning, becoming partly to mostly sunny in the afternoon. High 36°. Wind chill ranging from 3 to 29. Wind west-northwest around 7 mph, gusting to 23 mph.
Tuesday night	Clear in the evening, becoming fair to partly cloudy after midnight. Low 23°. Wind chill ranging from 16 to 27. Wind west around 6 mph, gusting to 17 mph.
Wednesday	Partly cloudy in the morning, becoming sunny in the afternoon. Relatively mild. High 49°. Wind west around 6 mph, gusting to 21 mph.
Wednesday night	Fair to partly cloudy in the evening, becoming partly cloudy after midnight. Low 23°. Wind west around 2 mph in the evening, becoming northwest after midnight.
Thursday	Mostly cloudy in the morning, becoming sunny in the afternoon. Breezy. High 31°. Wind chill ranging from 15 to 21. Wind north-northwest around 11 mph, gusting to 30 mph.
Thursday night	Clear. Low 16°. Wind chill ranging from 8 to 19. Wind north-northwest around 7 mph, gusting to 25 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