Yes

you do need a jacket based on the weather in Southall, UK 1 second ago

Why? Because it's quite chilly!

39°F4°C & Partly Cloudy

Wind is 2 mph4 km/h from the Northeast, gusting to 6 mph9 km/h

Date	Low	High	Wind	Day	Night
February 28	32°F0°C	50°F10°C	2 mph3 km/h from East	Partly Cloudy	Mostly Cloudy
March 1	32°F0°C	48°F9°C	1 mph2 km/h from South	Mostly Clear	Mostly Clear
March 2	31°F-0°C	50°F10°C	2 mph3 km/h from Southwest	Mostly Clear	Mostly Clear
March 3	32°F-0°C	53°F12°C	3 mph5 km/h from Southwest	Clear	Clear
March 4	33°F1°C	54°F12°C	4 mph7 km/h from Southwest	Mostly Clear	Clear
March 5	35°F2°C	57°F14°C	6 mph10 km/h from Southeast	Mostly Clear	Partly Cloudy
March 6	44°F7°C	54°F12°C	7 mph12 km/h from South	Mostly Cloudy	Cloudy

Low of 32°F0°C, High of 48°F9°C
Wind: 1 mph2 km/h
Precipitation: None