Yes

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

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

42°F6°C & Mostly Cloudy

Wind is 2 mph3 km/h from the South, gusting to 4 mph7 km/h

Date	Low	High	Wind	Day	Night
January 15	39°F4°C	47°F8°C	5 mph7 km/h from South	Mostly Cloudy	Partly Cloudy
January 16	35°F2°C	44°F7°C	3 mph5 km/h from South	Partly Cloudy	Partly Cloudy
January 17	33°F1°C	39°F4°C	3 mph5 km/h from Southeast	Mostly Cloudy	Mostly Cloudy
January 18	34°F1°C	41°F5°C	4 mph7 km/h from Southwest	Mostly Cloudy	Mostly Cloudy
January 19	36°F2°C	45°F7°C	6 mph9 km/h from South	Mostly Cloudy	Cloudy
January 20	37°F3°C	43°F6°C	4 mph6 km/h from Southeast	Cloudy	Cloudy
January 21	38°F3°C	45°F7°C	6 mph9 km/h from East	Drizzle	Cloudy

Low of 35°F2°C, High of 44°F7°C
Wind: 3 mph5 km/h
Precipitation: None