Yes

you do need a jacket based on the weather in Kamloops, BC, Canada 1 second ago

Why? Because it's cold enough to freeze the brass off a bald monkey!

13°F-11°C & Cloudy

Wind is 2 mph3 km/h from the Southeast, gusting to 6 mph10 km/h

Date	Low	High	Wind	Day	Night
January 20	8°F-13°C	24°F-4°C	2 mph3 km/h from East	Mostly Cloudy	Mostly Cloudy
January 21	18°F-8°C	33°F1°C	3 mph5 km/h from Southwest	Mostly Clear	Mostly Clear
January 22	19°F-7°C	30°F-1°C	1 mph2 km/h from Southeast	Mostly Cloudy	Mostly Cloudy
January 23	24°F-4°C	34°F1°C	2 mph4 km/h from West	Mostly Cloudy	Partly Cloudy
January 24	22°F-6°C	33°F0°C	7 mph11 km/h from Northwest	Partly Cloudy	Mostly Clear
January 25	17°F-8°C	28°F-2°C	1 mph2 km/h from Southwest	Mostly Clear	Mostly Clear
January 26	17°F-8°C	27°F-3°C	1 mph1 km/h from East	Clear	Mostly Clear

Low of 19°F-8°C, High of 33°F1°C
Wind: 3 mph5 km/h
Precipitation: None