OFallon Missouri Weather

OFallon - Weather Data from OFallon, MO

Latitude: N 38° 50' 20" Longitude: W 90° 43' 42" Altitude: 532 ft

CDT UTC Last station update CDT

WXSIM Forecast for: O'Fallon
Issued by: OFallonweather.com

Updated: Monday, 06-Apr-2026 04:00 pm

Tonight Partly Cloudy	Tuesday Mostly Cloudy	Tuesday night Partly Cloudy	Wednesday Partly Cloudy	Wednesday night Partly Cloudy	Thursday Partly Cloudy	Thursday night Partly Cloudy	Friday Chance rain
							<.25 in.
Low: 43°	High: 55°	Low: 38°	High: 70°	Low: 45°	High: 77°	Low: 51°	High: 66°

N 6-23 mph	ENE 8-27 mph	ESE 7-24 mph	SE→S 10-28 mph	S 9-22 mph	SSW 8-26 mph	SW 7-20 mph	SW→WNW 6-17 mph
	UV: 5 Medium		UV: 5 Medium		UV: 6 High

Tonight	Fair to partly cloudy in the evening, becoming mostly cloudy after midnight. Low 43°. Wind north around 6 mph, gusting to 23 mph.
Tuesday	Cloudy in the morning, becoming mostly cloudy in the afternoon. High 55°. UV index up to 5. Wind east-northeast around 8 mph, gusting to 27 mph.
Tuesday night	Fair to partly cloudy in the evening, becoming partly to mostly cloudy after midnight. Cold. Low 38°. Wind east-southeast around 7 mph, gusting to 24 mph.
Wednesday	Partly to mostly cloudy in the morning, becoming partly cloudy in the afternoon. High 70°. UV index up to 5. Wind southeast around 10 mph, gusting to 28 mph, in the morning, becoming south in the afternoon.
Wednesday night	Fair to partly cloudy. Low 45°. Wind south around 9 mph, gusting to 22 mph.
Thursday	Sunny in the morning, becoming partly cloudy in the afternoon. Warm. High 77°. UV index up to 6. Wind south-southwest around 8 mph, gusting to 26 mph.
Thursday night	Partly cloudy in the evening, becoming partly to mostly cloudy after midnight. Low 51°. Wind southwest around 7 mph, gusting to 20 mph.
Friday	Mostly cloudy to cloudy in the morning, becoming dense overcast in the afternoon. A slight chance of rain in the morning, then a chance of rain in the afternoon. High 66°. Wind southwest around 6 mph, gusting to 17 mph, in the morning, becoming west-northwest in the afternoon. Chance of precipitation 50 percent. Precipitation mostly less than a quarter of an inch.
Friday night	Dense overcast in the evening, becoming mostly cloudy to cloudy after midnight. Light to moderate fog. Rain likely in the evening, then a chance of rain after midnight. Low 50°. Wind north-northeast around 4 mph. Chance of precipitation 70 percent. Precipitation mostly around half an inch.
Saturday	Mostly cloudy to cloudy in the morning, becoming partly to mostly cloudy in the afternoon. Patchy light fog in the morning. A chance of rain in the morning, then a slight chance of rain in the afternoon. Mild. High 70°. UV index up to 5. Wind east around 5 mph, gusting to 19 mph. Chance of precipitation 40 percent. Precipitation mostly around a tenth of an inch.
Saturday night	Partly to mostly cloudy in the evening, becoming partly cloudy after midnight. Patchy light fog after midnight. Low 52°. Wind southeast around 7 mph.
Sunday	Partly to mostly cloudy in the morning, becoming cloudy in the afternoon. Patchy light fog in the morning. Breezy and warm. High 74°. Wind south-southwest around 13 mph, gusting to 26 mph.
Sunday night	Dense overcast in the evening, becoming cloudy after midnight. Patchy light fog after midnight. A chance of rain. Scattered thunderstorms likely. Mild. Low 63°. Wind south-southwest around 9 mph, gusting to 20 mph. Chance of precipitation 50 percent. Precipitation mostly less than a quarter of an inch.

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