Yes

you do need a jacket based on the weather in Klaipėda, Lithuania 1 second ago

Why? Because it's cold. simple as that.
40°F5°C & Cloudy

Wind is 6 mph10 km/h from the N, gusting to 10 mph16 km/h
April 24
11pm40°F5°C7 mph11 km/h NWCloudy
April 25
12am41°F5°C7 mph11 km/h NWCloudy
1am41°F5°C7 mph12 km/h NWCloudy
2am42°F5°C8 mph13 km/h NWCloudy
3am42°F6°C9 mph14 km/h NWCloudy
4am43°F6°C10 mph16 km/h NWCloudy
5am43°F6°C10 mph17 km/h WCloudy
6am44°F6°C11 mph18 km/h WCloudy
7am44°F7°C12 mph19 km/h WCloudy
8am44°F7°C12 mph19 km/h WCloudy
9am44°F7°C12 mph19 km/h WCloudy
10am43°F6°C11 mph18 km/h WMostly Cloudy
DateLowHighWindDayNight
April 2438°F3°C44°F7°C10 mph16 km/h from WCloudyPartly Cloudy
April 2535°F2°C51°F11°C8 mph12 km/h from SWMostly ClearMostly Clear
April 2640°F5°C59°F15°C7 mph12 km/h from SMostly ClearMostly Clear
April 2744°F7°C68°F20°C8 mph13 km/h from SEMostly ClearMostly Cloudy
April 2852°F11°C70°F21°C11 mph18 km/h from SMostly CloudyMostly Cloudy
April 2954°F12°C70°F21°C8 mph13 km/h from SPartly CloudyPartly Cloudy
April 3054°F12°C70°F21°C6 mph10 km/h from SEMostly ClearMostly Clear

Yes

Low of 36°F2°C, High of 51°F11°C
Wind: 8 mph12 km/h
Precipitation: 15% rain

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