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: Saturday, 31-Oct-2026 05:00 am

Today Cloudy	Tonight Cloudy	Sunday Cloudy	Sunday night Cloudy	Monday Cloudy	Monday night Cloudy	Tuesday Chance rain	Tuesday night Chance rain
		<.1 in.		<.1 in.		.1 in.	<.25 in.
High: 78°	Low: 64°	High: 72°	Low: 63°	High: 72°	Low: 64°	High: 70°	Low: 62°

SE 3-21 mph	ESE 4-19 mph	SE 7-26 mph	SE 6-23 mph	SSE 7-23→11-27 mph	SSE 11-26 mph	SSE 12-26 mph	SSE 8-22 mph

Today	Cloudy. Unusually warm. High 78°. Wind southeast around 3 mph, gusting to 21 mph.
Tonight	Cloudy in the evening, becoming dense overcast after midnight. Unusually warm. Low 64°. Wind east-southeast around 4 mph, gusting to 19 mph.
Sunday	Dense overcast in the morning, becoming cloudy in the afternoon. A chance of rain in the morning, then a slight chance of rain in the afternoon. Mild. High 72°. Wind southeast around 7 mph, gusting to 26 mph. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch.
Sunday night	Cloudy. Mild. Low 63°. Wind southeast around 6 mph, gusting to 23 mph.
Monday	Dense overcast in the morning, becoming cloudy in the afternoon. A slight chance of rain. Mild. High 72°. Wind south-southeast around 7 mph, gusting to 23 mph, in the morning, becoming 11 mph, gusting to 27 mph, in the afternoon. Chance of precipitation 20 percent. Precipitation mostly less than a tenth of an inch.
Monday night	Cloudy. Unusually warm. Low 64°. Wind south-southeast around 11 mph, gusting to 26 mph.
Tuesday	Cloudy in the morning, becoming dense overcast in the afternoon. A chance of rain. Breezy and mild. High 70°. Wind south-southeast around 12 mph, gusting to 26 mph. Chance of precipitation 50 percent. Precipitation mostly around a tenth of an inch.
Tuesday night	Cloudy in the evening, becoming mostly cloudy to cloudy after midnight. Patchy light fog after midnight. A chance of rain. Mild. Low 62°. Wind south-southeast around 8 mph, gusting to 22 mph. Chance of precipitation 50 percent. Precipitation mostly less than a quarter of an inch.
Wednesday	Partly to mostly cloudy in the morning, becoming mostly cloudy to cloudy in the afternoon. Moderate fog in the morning. A slight chance of rain in the morning, then a chance of rain in the afternoon. Mild. High 71°. Wind south-southeast around 4 mph, gusting to 18 mph. Chance of precipitation 50 percent. Precipitation mostly less than a quarter of an inch.
Wednesday night	Partly to mostly cloudy in the evening, becoming fair to partly cloudy after midnight. Moderate fog. A chance of rain in the evening, then a slight chance of rain after midnight. Mild. Low 59°. Wind east around 3 mph in the evening, becoming northeast after midnight. Chance of precipitation 60 percent. Precipitation mostly around a quarter of an inch.
Thursday	Mostly cloudy in the morning, becoming cloudy in the afternoon. Light to moderate fog. Rain likely. High 63°. Wind east-northeast near calm in the morning, becoming north-northwest around 5 mph, gusting to 18 mph, in the afternoon. Chance of precipitation 60 percent. Precipitation mostly less than a quarter of an inch.
Thursday night	Moderate fog. Low 51°. Wind north-northeast around 3 mph, gusting to 17 mph.
Friday	Mostly sunny in the morning, becoming partly to mostly cloudy in the afternoon. Moderate fog in the morning, then light to moderate fog in the afternoon. High 60°. Wind north-northeast around 2 mph in the morning, becoming east-northeast in the afternoon.
Friday night	Mostly cloudy in the evening, becoming partly cloudy after midnight. Patchy light fog. Relatively mild. Low 53°. Wind east-northeast near calm in the evening, becoming east-southeast after midnight.

WXSIM forecast formatting script by Saratoga-Weather.org.

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