Yes

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

Why? Because it's quite chilly!
41°F5°C & Clear

Wind is 5 mph8 km/h from the South, gusting to 11 mph17 km/h
November 6
12am41°F5°C5 mph8 km/h SouthClear
1am41°F5°C5 mph8 km/h SouthClear
2am42°F5°C5 mph9 km/h SouthMostly Clear
3am42°F6°C6 mph9 km/h SouthMostly Clear
4am42°F6°C6 mph9 km/h SouthClear
5am42°F6°C6 mph9 km/h SouthClear
6am43°F6°C6 mph9 km/h SouthClear
7am45°F7°C6 mph9 km/h SouthClear
8am49°F9°C6 mph9 km/h SouthClear
9am53°F12°C6 mph9 km/h SouthClear
10am55°F13°C6 mph10 km/h SouthClear
11am57°F14°C6 mph9 km/h SouthClear
DateLowHighWindDayNight
November 541°F5°C58°F14°C5 mph9 km/h from SouthClearClear
November 643°F6°C56°F14°C5 mph9 km/h from SouthClearClear
November 739°F4°C56°F13°C3 mph4 km/h from SouthClearPartly Cloudy
November 839°F4°C47°F8°C2 mph4 km/h from NorthwestCloudyMostly Cloudy
November 939°F4°C48°F9°C2 mph3 km/h from WestMostly CloudyMostly Cloudy
November 1038°F4°C47°F8°C2 mph2 km/h from SoutheastMostly CloudyPartly Cloudy
November 1138°F3°C49°F9°C3 mph5 km/h from WestPartly CloudyPartly Cloudy

Yes

Low of 43°F6°C, High of 56°F14°C
Wind: 5 mph9 km/h
Precipitation: None

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