Yes

you do need a jacket based on the weather in 05-260 Marki, Poland 1 second ago

Why? Because it's cool. Pleasantly cool, but cool!
57°F14°C & Clear

Wind is 7 mph11 km/h from the Northwest, gusting to 16 mph25 km/h
June 30
6pm57°F14°C7 mph11 km/h NorthwestClear
7pm55°F13°C6 mph10 km/h NorthwestClear
8pm53°F12°C6 mph9 km/h NorthwestClear
9pm52°F11°C5 mph8 km/h NorthwestClear
10pm51°F11°C5 mph7 km/h NorthwestClear
11pm51°F11°C4 mph7 km/h NorthwestClear
July 1
12am53°F12°C4 mph7 km/h NorthwestClear
1am57°F14°C4 mph7 km/h NorthwestClear
2am61°F16°C5 mph8 km/h NorthwestClear
3am64°F18°C5 mph9 km/h NorthwestClear
4am68°F20°C6 mph10 km/h NorthwestClear
5am70°F21°C7 mph11 km/h NorthwestClear
DateLowHighWindDayNight
June 2956°F13°C74°F23°C13 mph21 km/h from NorthwestPartly CloudyClear
June 3051°F11°C77°F25°C8 mph12 km/h from NorthwestMostly ClearClear
July 157°F14°C86°F30°C3 mph5 km/h from WestClearClear
July 264°F18°C92°F33°C9 mph15 km/h from WestMostly ClearMostly Clear
July 357°F14°C72°F22°C8 mph13 km/h from NorthwestMostly CloudyMostly Clear
July 452°F11°C76°F24°C3 mph5 km/h from WestMostly ClearPartly Cloudy
July 558°F14°C83°F28°C9 mph14 km/h from SouthPartly CloudyDrizzle

Yes

Low of 51°F11°C, High of 77°F25°C
Wind: 8 mph12 km/h
Precipitation: None

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