Yes

you do need a jacket based on the weather in Yakima, WA, USA 1 second ago

Why? Because too cold for just a hoodie, too warm for a parka!

35°F2°C & Mostly Cloudy

Wind is 1 mph2 km/h from the West, gusting to 2 mph4 km/h

Date	Low	High	Wind	Day	Night
January 15	25°F-4°C	38°F4°C	2 mph2 km/h from Southwest	Mostly Cloudy	Mostly Cloudy
January 16	30°F-1°C	43°F6°C	2 mph4 km/h from Northeast	Partly Cloudy	Mostly Clear
January 17	27°F-3°C	41°F5°C	3 mph4 km/h from North	Clear	Mostly Clear
January 18	25°F-4°C	36°F2°C	3 mph4 km/h from East	Partly Cloudy	Partly Cloudy
January 19	25°F-4°C	38°F3°C	4 mph6 km/h from North	Clear	Clear
January 20	18°F-8°C	35°F2°C	2 mph3 km/h from East	Mostly Clear	Mostly Cloudy
January 21	25°F-4°C	35°F2°C	1 mph2 km/h from East	Partly Cloudy	Mostly Clear

Low of 30°F-1°C, High of 43°F6°C
Wind: 2 mph4 km/h
Precipitation: None