Yes

you do need a jacket based on the weather in 08870 Sitges, Barcelona, Spain 1 second ago

Why? Because it's not very warm out.
51°F10°C & Mostly Clear

Wind is 3 mph5 km/h from the NW, gusting to 4 mph6 km/h
April 26
1am50°F10°C3 mph5 km/h NClear
2am52°F11°C3 mph5 km/h NClear
3am55°F13°C2 mph4 km/h NWClear
4am58°F14°C3 mph4 km/h SWClear
5am60°F16°C5 mph8 km/h SPartly Cloudy
6am62°F17°C7 mph11 km/h SMostly Cloudy
7am63°F17°C9 mph14 km/h SMostly Cloudy
8am63°F17°C9 mph15 km/h SMostly Cloudy
9am64°F18°C9 mph14 km/h SMostly Cloudy
10am65°F18°C9 mph15 km/h SMostly Cloudy
11am64°F18°C9 mph14 km/h SMostly Cloudy
12pm63°F17°C8 mph14 km/h SMostly Cloudy
DateLowHighWindDayNight
April 2550°F10°C65°F18°C7 mph11 km/h from SPartly CloudyCloudy
April 2656°F13°C66°F19°C10 mph17 km/h from SEDrizzleDrizzle
April 2755°F13°C65°F18°C5 mph8 km/h from ERainDrizzle
April 2855°F13°C62°F17°C7 mph11 km/h from NERainRain
April 2954°F12°C65°F19°C5 mph9 km/h from SWRainDrizzle
April 3052°F11°C68°F20°C8 mph13 km/h from SMostly ClearDrizzle
May 154°F12°C64°F18°C10 mph16 km/h from SWDrizzlePartly Cloudy

Yes

Low of 56°F14°C, High of 66°F19°C
Wind: 10 mph17 km/h
Precipitation: 48% rain

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