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: Monday, 17-Nov-2025 04:00 pm

Tonight Chance rain	Tuesday Partly Cloudy	Tuesday night Fog	Wednesday Mostly Cloudy	Wednesday night Mostly Cloudy	Thursday Chance rain	Thursday night Rain likely	Friday Rain likely
<.25 in.	<.1 in.			<.1 in.	.1 in.	1.0 in.	.35 in.
Low: 41°	High: 69°	Low: 42°	High: 58°	Low: 42°	High: 59°	Low: 50°	High: 53°

SE 9-22 mph	SSW→W 7-24 mph	N 4 mph	NNW→WNW 3-16 mph	ESE 2 mph	SE 5 mph	ESE→NNE 4 mph	NNE 6 mph

Tonight	Mostly cloudy to cloudy. A chance of rain. Low 41°. Wind southeast around 9 mph, gusting to 22 mph. Chance of precipitation 50 percent. Precipitation mostly less than a quarter of an inch.
Tuesday	Mostly cloudy in the morning, becoming partly cloudy in the afternoon. A chance of rain. Unusually warm. High 69°. Wind south-southwest around 7 mph, gusting to 24 mph, in the morning, becoming west in the afternoon. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch.
Tuesday night	Fair to partly cloudy in the evening, becoming mostly cloudy after midnight. Patchy light fog. Low 42°. Wind north around 4 mph.
Wednesday	Mostly cloudy to cloudy in the morning, becoming mostly cloudy in the afternoon. Relatively mild. High 58°. Wind north-northwest around 3 mph, gusting to 16 mph, in the morning, becoming west-northwest in the afternoon.
Wednesday night	Partly to mostly cloudy in the evening, becoming cloudy after midnight. A chance of rain after midnight. Low 42°. Wind east-southeast around 2 mph. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch.
Thursday	Cloudy in the morning, becoming dense overcast in the afternoon. A chance of rain in the morning, then a slight chance of rain in the afternoon. Mild. High 59°. Wind southeast around 5 mph. Chance of precipitation 50 percent. Precipitation mostly around a tenth of an inch.
Thursday night	Dense overcast. Patchy light fog in the evening, then light to moderate fog after midnight. Rain likely. Relatively mild. Low 50°. Wind east-southeast around 4 mph in the evening, becoming north-northeast after midnight. Chance of precipitation 80 percent. Precipitation mostly around an inch.
Friday	Dense overcast. Patchy light fog in the morning. Rain likely in the morning, then a chance of rain in the afternoon. High 53°. Wind north-northeast around 6 mph. Chance of precipitation 70 percent. Precipitation mostly between a quarter and half an inch.
Friday night	Cloudy in the evening, becoming partly to mostly cloudy after midnight. Patchy light fog in the evening, then moderate fog after midnight. A chance of rain in the evening, then a slight chance of rain after midnight. Low 40°. Wind north-northeast around 6 mph, gusting to 15 mph. Chance of precipitation 40 percent. Precipitation mostly less than a tenth of an inch.
Saturday	Sunny. Moderate fog in the morning. Relatively mild. High 57°. Wind north-northeast around 3 mph, gusting to 17 mph, in the morning, becoming west-northwest in the afternoon.
Saturday night	Fair in the evening, becoming clear after midnight. Patchy light fog in the evening, then light to moderate fog after midnight. Low 35°. Wind west-southwest around 3 mph.
Sunday	Sunny. Light to moderate fog in the morning. Mild. High 61°. Wind west-southwest around 4 mph, gusting to 19 mph.
Sunday night	Partly cloudy. Low 38°. Wind west-southwest near calm in the evening, becoming south-southeast 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