Yes

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

Why? Because it's quite chilly!

32°F0°C & Cloudy

Wind is 4 mph7 km/h from the West, gusting to 9 mph15 km/h

Date	Low	High	Wind	Day	Night
February 2	29°F-2°C	36°F2°C	5 mph8 km/h from West	Mostly Cloudy	Mostly Cloudy
February 3	28°F-2°C	39°F4°C	5 mph8 km/h from Southwest	Mostly Clear	Clear
February 4	28°F-2°C	39°F4°C	6 mph9 km/h from West	Mostly Clear	Cloudy
February 5	32°F0°C	37°F3°C	6 mph10 km/h from North	Cloudy	Cloudy
February 6	28°F-2°C	34°F1°C	13 mph21 km/h from East	Cloudy	Cloudy
February 7	26°F-3°C	34°F1°C	10 mph17 km/h from Southeast	Mostly Cloudy	Partly Cloudy
February 8	24°F-5°C	34°F1°C	9 mph14 km/h from East	Partly Cloudy	Partly Cloudy

Low of 28°F-3°C, High of 39°F4°C
Wind: 5 mph8 km/h
Precipitation: None