Yes

you do need a jacket based on the weather in Wrocław, Poland 1 second ago

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

37°F3°C & Mostly Cloudy

Wind is 6 mph10 km/h from the Northwest, gusting to 14 mph23 km/h

Date	Low	High	Wind	Day	Night
February 28	34°F1°C	40°F4°C	9 mph14 km/h from Northwest	Drizzle	Cloudy
March 1	32°F-0°C	43°F6°C	10 mph16 km/h from Northwest	Mostly Cloudy	Mostly Cloudy
March 2	34°F1°C	47°F8°C	7 mph11 km/h from West	Partly Cloudy	Partly Cloudy
March 3	31°F-1°C	51°F11°C	9 mph14 km/h from West	Mostly Clear	Mostly Clear
March 4	31°F-0°C	56°F13°C	10 mph17 km/h from West	Partly Cloudy	Mostly Clear
March 5	36°F2°C	58°F15°C	6 mph10 km/h from West	Clear	Mostly Clear
March 6	34°F1°C	57°F14°C	6 mph10 km/h from South	Mostly Clear	Mostly Clear

Low of 31°F-1°C, High of 43°F6°C
Wind: 10 mph16 km/h
Precipitation: None