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: Friday, 12-Dec-2025 05:00 am

Today Partly Cloudy	Tonight Mostly Cloudy	Saturday Mostly Cloudy	Saturday night Mostly Cloudy	Sunday Sunny	Sunday night Clear	Monday Sunny	Monday night Partly Cloudy

High: 42°	Low: 26°	High: 29°	Low: 11°	High: 24°	Low: 12°	High: 41°	Low: 21°
			WCh: 2°		WCh: 3°
N 6-23 mph	NNW 3-18 mph	N 6-24 mph	N 8-26 mph	NNW 8-23→4-23 mph	SE 4-15 mph	SSW 9-27 mph	SW 4 mph

Today	Partly cloudy in the morning, becoming mostly cloudy in the afternoon. High 42°. Wind north around 6 mph, gusting to 23 mph.
Tonight	Partly to mostly cloudy in the evening, becoming cloudy after midnight. Low 26°. Wind north-northwest around 3 mph, gusting to 18 mph.
Saturday	Mostly cloudy to cloudy in the morning, becoming dense overcast in the afternoon. High 29°. Wind chill around 21. Wind north around 6 mph, gusting to 24 mph.
Saturday night	Mostly cloudy in the evening, becoming clear after midnight. Cold. Low 11°. Wind chill ranging from 2 to 19. Wind north around 8 mph, gusting to 26 mph.
Sunday	Sunny. Cold. High 24°. Wind north-northwest around 8 mph, gusting to 23 mph, in the morning, becoming 4 mph, gusting to 23 mph, in the afternoon.
Sunday night	Clear. Cold. Low 12°. Wind chill ranging from 3 to 17. Wind southeast around 4 mph, gusting to 15 mph.
Monday	Sunny. High 41°. Wind south-southwest around 9 mph, gusting to 27 mph.
Monday night	Fair to partly cloudy in the evening, becoming fair after midnight. Low 21°. Wind southwest around 4 mph.
Tuesday	Sunny in the morning, becoming partly to mostly sunny in the afternoon. Relatively mild. High 54°. Wind southwest around 7 mph, gusting to 22 mph.
Tuesday night	Partly cloudy in the evening, becoming partly to mostly cloudy after midnight. Low 33°. Wind southwest around 7 mph.
Wednesday	Cloudy. A slight chance of rain. Relatively mild. High 52°. Wind south-southwest around 8 mph, gusting to 17 mph. Chance of precipitation 20 percent. Precipitation mostly less than a tenth of an inch.
Wednesday night	Cloudy in the evening, becoming partly to mostly cloudy after midnight. Relatively mild. Low 47°. Wind south-southwest around 11 mph, gusting to 18 mph.
Thursday	Cloudy. A slight chance of rain. Mild. High 59°. Wind southwest around 6 mph. Chance of precipitation 20 percent. Precipitation mostly less than a tenth of an inch.
Thursday night	Cloudy in the evening, becoming dense overcast after midnight. Patchy light fog after midnight. A chance of rain. Relatively mild. Low 50°. Wind southwest around 3 mph in the evening, becoming west-northwest after midnight. Chance of precipitation 50 percent. Precipitation mostly less than a quarter of an inch.

WXSIM forecast formatting script by Saratoga-Weather.org.

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