Yes

you do need a jacket based on the weather in Brussels, Belgium 1 second ago

Why? Because there's a refreshing nip in the air!

41°F5°C & Partly Cloudy

Wind is 5 mph8 km/h from the North, gusting to 12 mph20 km/h

Date	Low	High	Wind	Day	Night
February 27	38°F3°C	47°F8°C	6 mph9 km/h from North	Mostly Cloudy	Mostly Cloudy
February 28	35°F2°C	44°F7°C	7 mph12 km/h from Northeast	Mostly Cloudy	Partly Cloudy
March 1	33°F0°C	48°F9°C	6 mph9 km/h from Northeast	Partly Cloudy	Mostly Clear
March 2	30°F-1°C	48°F9°C	3 mph5 km/h from Northeast	Partly Cloudy	Partly Cloudy
March 3	31°F-1°C	50°F10°C	2 mph3 km/h from Northwest	Partly Cloudy	Mostly Clear
March 4	32°F0°C	53°F12°C	6 mph10 km/h from Southwest	Mostly Clear	Clear
March 5	34°F1°C	57°F14°C	6 mph9 km/h from South	Clear	Mostly Clear

Low of 36°F2°C, High of 45°F7°C
Wind: 7 mph12 km/h
Precipitation: None