OFallon Missouri Weather

OFallon - Weather Data from OFallon, MO

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

CST UTC Last station update CST

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

Updated: Monday, 15-Dec-2025 05:00 am

Today Mostly Sunny	Tonight Clear	Tuesday Sunny	Tuesday night Partly Cloudy	Wednesday Sunny	Wednesday night Partly Cloudy	Thursday Rain likely	Thursday night Partly Cloudy
						.5 in.
High: 39°	Low: 19°	High: 52°	Low: 28°	High: 55°	Low: 38°	High: 51°	Low: 25°
WCh: 1°	WCh: 13°						WCh: 18°
SSW 8-24 mph	SW 5 mph	SW 7-23 mph	SW 6 mph	W→ESE 3-15 mph	SSE 7→11-17 mph	SSW→WNW 11-26 mph	WNW 14-27→11-27 mph

Today	Mostly sunny in the morning, becoming sunny in the afternoon. High 39°. Wind chill ranging from 1 to 32. Wind south-southwest around 8 mph, gusting to 24 mph.
Tonight	Clear. Low 19°. Wind chill ranging from 13 to 28. Wind southwest around 5 mph.
Tuesday	Sunny. Relatively mild. High 52°. Wind southwest around 7 mph, gusting to 23 mph.
Tuesday night	Partly cloudy. Low 28°. Wind southwest around 6 mph.
Wednesday	Sunny. Relatively mild. High 55°. Wind west around 3 mph, gusting to 15 mph, in the morning, becoming east-southeast in the afternoon.
Wednesday night	Partly cloudy in the evening, becoming cloudy after midnight. Low 38°, but temperatures rising after midnight. Wind south-southeast around 7 mph in the evening, becoming 11 mph, gusting to 17 mph, after midnight.
Thursday	Cloudy in the morning, becoming partly to mostly cloudy in the afternoon. Light to moderate fog in the afternoon. Rain likely in the morning, then a chance of rain in the afternoon. Breezy and relatively mild. High 51°, but temperatures falling in the afternoon. Wind south-southwest around 11 mph, gusting to 26 mph, in the morning, becoming west-northwest in the afternoon. Chance of precipitation 70 percent. Precipitation mostly around half an inch.
Thursday night	Partly cloudy in the evening, becoming fair to partly cloudy after midnight. Breezy. Low 25°. Wind chill ranging from 18 to 35. Wind west-northwest around 14 mph, gusting to 27 mph, in the evening, becoming 11 mph, gusting to 27 mph, after midnight.
Friday	Sunny in the morning, becoming partly to mostly sunny in the afternoon. High 42°. Wind west-northwest around 5 mph, gusting to 23 mph, in the morning, becoming south in the afternoon.
Friday night	Partly cloudy in the evening, becoming fair to partly cloudy after midnight. Low 26°. Wind chill ranging from 18 to 33. Wind south-southeast around 9 mph, gusting to 18 mph.
Saturday	Partly cloudy. Relatively mild. High 55°. Wind south-southeast around 9 mph, gusting to 22 mph, in the morning, becoming south-southwest in the afternoon.
Saturday night	Partly to mostly cloudy. Low 26°. Wind northwest around 6 mph, gusting to 15 mph.
Sunday	Partly cloudy. High 43°. Wind north-northeast around 5 mph, gusting to 17 mph, in the morning, becoming east-northeast in the afternoon.
Sunday night	Partly to mostly cloudy in the evening, becoming dense overcast after midnight. Low 30°. Wind chill ranging from 23 to 33. Wind east around 8 mph.

WXSIM forecast formatting script by Saratoga-Weather.org.

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