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: Saturday, 20-Dec-2025 05:00 am

Today Partly Cloudy	Tonight Partly Cloudy	Sunday Mostly Sunny	Sunday night Partly Cloudy	Monday Mostly Cloudy	Monday night Mostly Cloudy	Tuesday Mostly Sunny	Tuesday night Partly Cloudy

High: 56°	Low: 25°	High: 47°	Low: 25°	High: 49°	Low: 37°	High: 62°	Low: 32°
			WCh: 20°
S→WNW 7-26 mph	NW 4-19 mph	ENE 3-18 mph	SE 5 mph	SE 6 mph	S 6 mph	WSW→WNW 5-20 mph	NNE→ENE 3 mph

Today	Partly to mostly sunny in the morning, becoming partly cloudy in the afternoon. Relatively mild. High 56°. Wind south around 7 mph, gusting to 26 mph, in the morning, becoming west-northwest in the afternoon.
Tonight	Fair to partly cloudy in the evening, becoming mostly clear after midnight. Low 25°. Wind northwest around 4 mph, gusting to 19 mph.
Sunday	Partly to mostly sunny in the morning, becoming sunny in the afternoon. Relatively mild. High 47°. Wind east-northeast around 3 mph, gusting to 18 mph.
Sunday night	Partly cloudy in the evening, becoming fair to partly cloudy after midnight. Low 25°. Wind chill ranging from 20 to 37. Wind southeast around 5 mph.
Monday	Partly to mostly cloudy in the morning, becoming mostly cloudy in the afternoon. Relatively mild. High 49°. Wind southeast around 6 mph.
Monday night	Fair in the evening, becoming partly to mostly cloudy after midnight. Low 37°. Wind south around 6 mph.
Tuesday	Mostly sunny in the morning, becoming sunny in the afternoon. Unusually mild. High 62°. Wind west-southwest around 5 mph, gusting to 20 mph, in the morning, becoming west-northwest in the afternoon.
Tuesday night	Fair to partly cloudy in the evening, becoming partly cloudy after midnight. Low 32°. Wind north-northeast around 3 mph in the evening, becoming east-northeast after midnight.
Wednesday	Cloudy. A slight chance of rain. Relatively mild. High 55°. Wind southeast around 7 mph. Chance of precipitation 20 percent. Precipitation mostly less than a tenth of an inch.
Wednesday night	Partly to mostly cloudy in the evening, becoming fair after midnight. Relatively mild. Low 46°. Wind south-southwest around 8 mph.
Thursday	Partly to mostly cloudy in the morning, becoming mostly sunny in the afternoon. Exceptionally warm. High 70°. Wind southwest around 8 mph, gusting to 21 mph.
Thursday night	Partly cloudy in the evening, becoming cloudy after midnight. Relatively mild. Low 46°. Wind west-southwest around 9 mph, gusting to 15 mph.
Friday	Partly to mostly cloudy in the morning, becoming mostly sunny in the afternoon. Relatively mild. High 55°. Wind north-northwest around 9 mph, gusting to 26 mph.
Friday night	Mostly clear. Low 30°. Wind northeast around 3 mph, gusting to 21 mph.

WXSIM forecast formatting script by Saratoga-Weather.org.

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