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: Thursday, 29-Oct-2026 04:00 pm

Tonight Thunder storm	Friday Fog a.m.	Friday night Fog	Saturday Cloudy	Saturday night Mostly Cloudy	Sunday Cloudy	Sunday night Cloudy	Monday Cloudy
<.1 in.	<.1 in.			<.1 in.	<.1 in.
Low: 58°	High: 69°	Low: 55°	High: 68°	Low: 56°	High: 69°	Low: 58°	High: 69°

NE 3-18 mph	E 5-16 mph	ESE 4 mph	SE 3 mph	E 3 mph	E 4-19 mph	SE 5-17 mph	SE 6-19→10-23 mph

Tonight	Partly cloudy in the evening, becoming partly to mostly cloudy after midnight. Patchy light fog in the evening, then light to moderate fog after midnight. A chance of rain. Scattered thundershowers possible. Mild. Low 58°. Wind northeast around 3 mph, gusting to 18 mph. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch.
Friday	Mostly cloudy to cloudy in the morning, becoming mostly cloudy in the afternoon. Patchy light fog in the morning. A chance of rain. Mild. High 69°. Wind east around 5 mph, gusting to 16 mph. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch.
Friday night	Partly to mostly cloudy in the evening, becoming mostly cloudy to cloudy after midnight. Patchy light fog. Relatively mild. Low 55°. Wind east-southeast around 4 mph.
Saturday	Cloudy. Mild. High 68°. Wind southeast around 3 mph.
Saturday night	Cloudy in the evening, becoming mostly cloudy to cloudy after midnight. A slight chance of rain. Mild. Low 56°. Wind east around 3 mph. Chance of precipitation 20 percent. Precipitation mostly less than a tenth of an inch.
Sunday	Cloudy. A slight chance of rain. Mild. High 69°. Wind east around 4 mph, gusting to 19 mph. Chance of precipitation 20 percent. Precipitation mostly less than a tenth of an inch.
Sunday night	Cloudy. Mild. Low 58°. Wind southeast around 5 mph, gusting to 17 mph.
Monday	Cloudy. Mild. High 69°. Wind southeast around 6 mph, gusting to 19 mph, in the morning, becoming 10 mph, gusting to 23 mph, in the afternoon.
Monday night	Mostly cloudy to cloudy in the evening, becoming cloudy after midnight. Mild. Low 59°. Wind southeast around 10 mph, gusting to 21 mph.
Tuesday	Cloudy in the morning, becoming dense overcast in the afternoon. Patchy light fog. Rain very likely. Precipitation showery or intermittent. High 64°. Wind south-southeast around 11 mph, gusting to 20 mph. Chance of precipitation 80 percent. Precipitation mostly around an inch.
Tuesday night	Dense overcast. Patchy light fog. Rain. Scattered thunderstorms likely. Mild. Low 60°. Wind south-southeast around 8 mph, gusting to 20 mph, in the evening, becoming north-northwest after midnight. Chance of precipitation 90 percent. Precipitation mostly around an inch.
Wednesday	Dense overcast. Patchy light fog. Rain likely in the morning, then a chance of rain in the afternoon. Precipitation showery or intermittent. High 62°. Wind northeast around 4 mph, gusting to 20 mph. Chance of precipitation 80 percent. Precipitation mostly between a quarter and half an inch.
Wednesday night	Dense overcast in the evening, becoming mostly cloudy to cloudy after midnight. Patchy light fog. A chance of rain. Precipitation showery or intermittent. Low 51°. Wind north-northwest around 9 mph, gusting to 21 mph. Chance of precipitation 50 percent. Precipitation mostly less than a tenth of an inch.

WXSIM forecast formatting script by Saratoga-Weather.org.

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