No

you don't need a jacket based on the weather in Donetsk, Donetsk Oblast, Ukraine 1 second ago

59°F15°C & Mostly Cloudy

Wind is 7 mph11 km/h from the North, gusting to 15 mph24 km/h

Date	Low	High	Wind	Day	Night
July 2	56°F13°C	74°F24°C	8 mph14 km/h from North	Partly Cloudy	Clear
July 3	58°F15°C	83°F28°C	4 mph7 km/h from North	Mostly Clear	Mostly Clear
July 4	65°F18°C	86°F30°C	7 mph12 km/h from Northwest	Partly Cloudy	Mostly Clear
July 5	62°F17°C	82°F28°C	6 mph9 km/h from Northeast	Clear	Clear
July 6	63°F17°C	86°F30°C	5 mph9 km/h from Southeast	Clear	Clear
July 7	67°F20°C	90°F32°C	6 mph10 km/h from Southeast	Clear	Clear
July 8	70°F21°C	91°F33°C	10 mph15 km/h from Southeast	Clear	Clear

Low of 58°F15°C, High of 82°F28°C
Wind: 4 mph7 km/h
Precipitation: None