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, 13-Oct-2025 05:00 am

Today Mostly Cloudy	Tonight Partly Cloudy	Tuesday Mostly Sunny	Tuesday night Partly Cloudy	Wednesday Partly Cloudy	Wednesday night Mostly Clear	Thursday Partly Cloudy	Thursday night Partly Cloudy

High: 88°	Low: 61°	High: 87°	Low: 57°	High: 87°	Low: 52°	High: 84°	Low: 55°

S 1-19 mph	E calm	E 3-25 mph	ESE 1-16 mph	SSE→ESE 2-22 mph	ESE 3-16 mph	SE 3-24→8-26 mph	SE 6-20 mph
		UV: 5 Medium		UV: 5 Medium		UV: 5 Medium

Today	Cloudy in the morning, becoming mostly cloudy in the afternoon. Unusually hot. High 88°. Wind south around 1 mph, gusting to 19 mph.
Tonight	Fair to partly cloudy in the evening, becoming partly cloudy after midnight. Mild. Low 61°. Wind east near calm.
Tuesday	Mostly sunny in the morning, becoming sunny in the afternoon. Unusually hot. High 87°. UV index up to 5. Wind east around 3 mph, gusting to 25 mph.
Tuesday night	Mostly clear in the evening, becoming fair to partly cloudy after midnight. Low 57°. Wind east-southeast around 1 mph, gusting to 16 mph.
Wednesday	Partly cloudy in the morning, becoming sunny in the afternoon. Unusually hot. High 87°. UV index up to 5. Wind south-southeast around 2 mph, gusting to 22 mph, in the morning, becoming east-southeast in the afternoon.
Wednesday night	Clear in the evening, becoming mostly clear after midnight. Low 52°. Wind east-southeast around 3 mph, gusting to 16 mph.
Thursday	Sunny in the morning, becoming partly cloudy in the afternoon. Unusually hot. High 84°. UV index up to 5. Wind southeast around 3 mph, gusting to 24 mph, in the morning, becoming 8 mph, gusting to 26 mph, in the afternoon.
Thursday night	Partly cloudy in the evening, becoming partly to mostly cloudy after midnight. Low 55°. Wind southeast around 6 mph, gusting to 20 mph.
Friday	Partly cloudy in the morning, becoming sunny in the afternoon. Unusually hot. High 85°. UV index up to 4. Wind south-southeast around 6 mph, gusting to 25 mph.
Friday night	Fair to partly cloudy in the evening, becoming partly cloudy after midnight. Low 57°. Wind south around 7 mph, gusting to 17 mph.
Saturday	Cloudy in the morning, becoming partly to mostly cloudy in the afternoon. Patchy light fog in the morning, then moderate to dense fog in the afternoon. Rain likely. Scattered thundershowers possible. High 70°. Wind south around 6 mph, gusting to 16 mph, in the morning, becoming southwest in the afternoon. Chance of precipitation 80 percent. Precipitation mostly around an inch.
Saturday night	Partly cloudy in the evening, becoming clear after midnight. Light to moderate fog in the evening. Low 52°. Wind northwest around 5 mph, gusting to 15 mph.
Sunday	Sunny. High 69°. Wind northwest around 6 mph, gusting to 26 mph, in the morning, becoming 10 mph, gusting to 27 mph, in the afternoon.
Sunday night	Clear. Low 45°. Wind west-northwest around 3 mph, gusting to 18 mph.

WXSIM forecast formatting script by Saratoga-Weather.org.

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