Yes

you do need a jacket based on the weather in Harburg, Hamburg, Germany 1 second ago

Why? Because it's bitterly cold.
40°F4°C & Cloudy

Wind is 7 mph11 km/h from the S, gusting to 16 mph25 km/h
April 25
9pm40°F5°C7 mph12 km/h SDrizzle
10pm40°F5°C8 mph13 km/h SEDrizzle
11pm41°F5°C9 mph14 km/h SECloudy
April 26
12am41°F5°C9 mph14 km/h SDrizzle
1am41°F5°C9 mph15 km/h SDrizzle
2am42°F6°C10 mph16 km/h SCloudy
3am43°F6°C10 mph15 km/h SDrizzle
4am43°F6°C10 mph16 km/h SDrizzle
5am44°F7°C10 mph17 km/h SWDrizzle
6am46°F8°C11 mph18 km/h SWDrizzle
7am46°F8°C10 mph16 km/h SWDrizzle
8am47°F9°C10 mph17 km/h SWDrizzle
DateLowHighWindDayNight
April 2539°F4°C51°F10°C10 mph15 km/h from SWDrizzleMostly Cloudy
April 2640°F4°C63°F17°C7 mph10 km/h from SEMostly CloudyMostly Cloudy
April 2749°F9°C69°F20°C8 mph13 km/h from SMostly CloudyCloudy
April 2849°F10°C64°F18°C3 mph5 km/h from SMostly CloudyDrizzle
April 2951°F10°C71°F21°C7 mph12 km/h from EMostly CloudyMostly Clear
April 3054°F12°C76°F24°C10 mph17 km/h from EMostly ClearPartly Cloudy
May 157°F14°C76°F25°C12 mph19 km/h from EMostly ClearMostly Clear

Yes

Low of 40°F5°C, High of 63°F17°C
Wind: 7 mph10 km/h
Precipitation: 19% rain

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