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, 13-Dec-2025 04:00 pm

Tonight Mostly Cloudy Cold!	Sunday Sunny Cold!	Sunday night Clear	Monday Sunny	Monday night Mostly Clear	Tuesday Sunny	Tuesday night Partly Cloudy	Wednesday Partly Cloudy

Low: 5°	High: 21°	Low: 9°	High: 43°	Low: 20°	High: 54°	Low: 29°	High: 56°
WCh: -7°	WCh: -9°	WCh: -1°
NNW 9-21 mph	N 9-20→5-20 mph	ESE→SSE 2→5 mph	S→SW 9-26 mph	SW 5 mph	SW 7-22 mph	SW 6 mph	WSW→SSE 3 mph

Tonight	Mostly cloudy in the evening, becoming clear after midnight. Very cold. Low 5°. Wind chill ranging from -7 to 4. Wind north-northwest around 9 mph, gusting to 21 mph.
Sunday	Sunny. Cold. High 21°. Wind chill ranging from -9 to 16. Wind north around 9 mph, gusting to 20 mph, in the morning, becoming 5 mph, gusting to 20 mph, in the afternoon.
Sunday night	Clear. Cold. Low 9°. Wind chill ranging from -1 to 15. Wind east-southeast around 2 mph in the evening, becoming south-southeast around 5 mph after midnight.
Monday	Sunny. High 43°. Wind south around 9 mph, gusting to 26 mph, in the morning, becoming southwest in the afternoon.
Monday night	Mostly clear in the evening, becoming clear after midnight. Low 20°. Wind southwest around 5 mph.
Tuesday	Sunny. Relatively mild. High 54°. Wind southwest around 7 mph, gusting to 22 mph.
Tuesday night	Fair to partly cloudy. Low 29°. Wind southwest around 6 mph.
Wednesday	Partly to mostly sunny in the morning, becoming partly cloudy in the afternoon. Relatively mild. High 56°. Wind west-southwest around 3 mph in the morning, becoming south-southeast in the afternoon.
Wednesday night	Cloudy. A slight chance of rain. Relatively mild. Low 42°, but temperatures rising after midnight. Wind south-southeast around 8 mph in the evening, becoming 11 mph, gusting to 17 mph, after midnight. Chance of precipitation 20 percent. Precipitation mostly less than a tenth of an inch.
Thursday	Cloudy in the morning, becoming partly cloudy in the afternoon. Patchy light fog in the morning. Rain likely. Breezy and relatively mild. High 51°, but temperatures falling in the afternoon. Wind southwest around 11 mph, gusting to 23 mph, in the morning, becoming west-northwest in the afternoon. Chance of precipitation 60 percent. Precipitation mostly around a quarter of an inch.
Thursday night	Fair in the evening, becoming fair to partly cloudy after midnight. Breezy. Low 26°. Wind west-northwest around 14 mph, gusting to 23 mph, in the evening, becoming 9 mph, gusting to 23 mph, after midnight.
Friday	Partly to mostly sunny in the morning, becoming partly cloudy in the afternoon. High 47°. Wind northwest around 3 mph, gusting to 16 mph, in the morning, becoming south-southeast around 8 mph, gusting to 23 mph, in the afternoon.
Friday night	Mostly clear in the evening, becoming partly to mostly cloudy after midnight. Low 33°. Wind chill ranging from 26 to 36. Wind south-southeast around 10 mph, gusting to 19 mph.

WXSIM forecast formatting script by Saratoga-Weather.org.

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