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: Friday, 30-Oct-2026 05:00 am

Today Partly Cloudy	Tonight Mostly Cloudy	Saturday Cloudy	Saturday night Chance rain	Sunday Rain likely	Sunday night Mostly Cloudy	Monday Cloudy	Monday night Chance rain
<.1 in.			.1 in.	<.25 in.		<.1 in.	<.1 in.
High: 80°	Low: 64°	High: 75°	Low: 62°	High: 71°	Low: 62°	High: 71°	Low: 63°

ESE 5-24 mph	ESE 4-19 mph	ESE 3-21 mph	E→SSE 4-18 mph	SSE 5-22 mph	SSE 6-19 mph	SSE 8-21→11-26 mph	SSE 12-25 mph

Today	Partly to mostly cloudy in the morning, becoming partly cloudy in the afternoon. A chance of rain. Unusually warm. High 80°. Wind east-southeast around 5 mph, gusting to 24 mph. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch.
Tonight	Partly to mostly cloudy in the evening, becoming mostly cloudy to cloudy after midnight. Mild. Low 64°. Wind east-southeast around 4 mph, gusting to 19 mph.
Saturday	Cloudy. Unusually warm. High 75°. Wind east-southeast around 3 mph, gusting to 21 mph.
Saturday night	Mostly cloudy to cloudy in the evening, becoming cloudy after midnight. A slight chance of rain in the evening, then a chance of rain after midnight. Mild. Low 62°. Wind east around 4 mph, gusting to 18 mph, in the evening, becoming south-southeast after midnight. Chance of precipitation 40 percent. Precipitation mostly around a tenth of an inch.
Sunday	Dense overcast in the morning, becoming mostly cloudy to cloudy in the afternoon. Patchy light fog in the morning. Rain likely. Mild. High 71°. Wind south-southeast around 5 mph, gusting to 22 mph. Chance of precipitation 60 percent. Precipitation mostly less than a quarter of an inch.
Sunday night	Mostly cloudy to cloudy in the evening, becoming cloudy after midnight. Mild. Low 62°. Wind south-southeast around 6 mph, gusting to 19 mph.
Monday	Dense overcast in the morning, becoming cloudy in the afternoon. A chance of rain. Mild. High 71°. Wind south-southeast around 8 mph, gusting to 21 mph, in the morning, becoming 11 mph, gusting to 26 mph, in the afternoon. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch.
Monday night	Cloudy. A slight chance of rain in the evening, then a chance of rain after midnight. Breezy and mild. Low 63°. Wind south-southeast around 12 mph, gusting to 25 mph. Chance of precipitation 40 percent. Precipitation mostly less than a tenth of an inch.
Tuesday	Dense overcast. Rain likely in the morning, then a chance of rain in the afternoon. Scattered thundershowers possible. Breezy and mild. High 69°. Wind south-southeast around 12 mph, gusting to 24 mph. Chance of precipitation 80 percent. Precipitation mostly around half an inch.
Tuesday night	Cloudy. Patchy light fog in the evening, then light to moderate fog after midnight. Rain likely. Scattered thundershowers possible. Unusually warm. Low 64°. Wind south-southeast around 9 mph, gusting to 23 mph, in the evening, becoming 4 mph, gusting to 17 mph, after midnight. Chance of precipitation 70 percent. Precipitation mostly around a quarter of an inch.
Wednesday	Cloudy in the morning, becoming mostly cloudy in the afternoon. Light to moderate fog in the morning. A chance of rain in the morning, then a slight chance of rain in the afternoon. Precipitation showery or intermittent. Mild. High 66°. Wind north-northwest around 7 mph, gusting to 24 mph. Chance of precipitation 50 percent. Precipitation mostly around a tenth of an inch.
Wednesday night	Partly cloudy in the evening, becoming mostly cloudy to cloudy after midnight. Patchy light fog. A slight chance of rain. Mild. Low 56°. Wind northeast around 5 mph, gusting to 21 mph, in the evening, becoming near calm after midnight. Chance of precipitation 20 percent. Precipitation mostly less than a tenth of an inch.
Thursday	Dense overcast in the morning, becoming cloudy in the afternoon. A chance of rain. High 61°. Wind northwest around 5 mph, gusting to 19 mph, in the morning, becoming 8 mph, gusting to 22 mph, in the afternoon. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch.
Thursday night	Partly to mostly cloudy in the evening, becoming fair to partly cloudy after midnight. Patchy light fog in the evening, then light to moderate fog after midnight. Low 51°. Wind northwest around 5 mph, gusting to 19 mph.

WXSIM forecast formatting script by Saratoga-Weather.org.

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