Yes

you do need a jacket based on the weather in Plovdiv, Bulgaria 1 second ago

Why? Because it's pretty chilly.
54°F12°C & Partly Cloudy

Wind is 2 mph4 km/h from the SW, gusting to 6 mph9 km/h
May 2
1am55°F13°C3 mph4 km/h WMostly Cloudy
2am58°F14°C3 mph4 km/h NWPartly Cloudy
3am60°F16°C3 mph5 km/h NWPartly Cloudy
4am63°F17°C3 mph4 km/h NWPartly Cloudy
5am65°F18°C3 mph4 km/h NPartly Cloudy
6am67°F19°C3 mph5 km/h NPartly Cloudy
7am69°F20°C3 mph5 km/h NPartly Cloudy
8am70°F21°C4 mph6 km/h NPartly Cloudy
9am71°F22°C4 mph7 km/h NEPartly Cloudy
10am70°F21°C5 mph8 km/h NEPartly Cloudy
11am69°F21°C6 mph10 km/h EPartly Cloudy
12pm67°F20°C6 mph10 km/h EPartly Cloudy
DateLowHighWindDayNight
May 150°F10°C71°F22°C4 mph6 km/h from NPartly CloudyRain
May 252°F11°C62°F16°C5 mph9 km/h from NWRainRain
May 349°F10°C60°F16°C7 mph11 km/h from WRainDrizzle
May 448°F9°C72°F22°C4 mph6 km/h from NEMostly ClearMostly Clear
May 548°F9°C75°F24°C3 mph5 km/h from NEMostly ClearPartly Cloudy
May 653°F12°C77°F25°C4 mph6 km/h from NPartly CloudyMostly Cloudy
May 756°F13°C70°F21°C6 mph9 km/h from EDrizzleDrizzle

Yes

Low of 52°F11°C, High of 62°F17°C
Wind: 5 mph9 km/h
Precipitation: 79% rain

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