Yes

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

Why? Because it's pretty chilly and it's fairly windy outside!

57°F14°C & Partly Cloudy

Wind is 11 mph17 km/h from the West, gusting to 23 mph37 km/h

Date	Low	High	Wind	Day	Night
June 14	55°F13°C	65°F18°C	12 mph19 km/h from West	Mostly Cloudy	Partly Cloudy
June 15	54°F12°C	72°F22°C	11 mph17 km/h from West	Partly Cloudy	Mostly Cloudy
June 16	54°F12°C	66°F19°C	12 mph19 km/h from West	Mostly Cloudy	Mostly Cloudy
June 17	54°F12°C	66°F19°C	10 mph16 km/h from West	Partly Cloudy	Clear
June 18	50°F10°C	74°F24°C	4 mph6 km/h from Southeast	Mostly Clear	Partly Cloudy
June 19	56°F13°C	76°F25°C	7 mph12 km/h from South	Mostly Cloudy	Mostly Clear
June 20	56°F14°C	77°F25°C	6 mph10 km/h from Southeast	Mostly Clear	Partly Cloudy

Low of 54°F12°C, High of 72°F22°C
Wind: 11 mph17 km/h
Precipitation: None