Yes

you do need a jacket based on the weather in Opatija, Croatia 1 second ago

Why? Because it's quite chilly!
40°F5°C & Clear

Wind is 5 mph8 km/h from the North, gusting to 12 mph20 km/h
March 3
7pm40°F5°C5 mph9 km/h NorthClear
8pm40°F4°C6 mph9 km/h NorthClear
9pm40°F4°C6 mph9 km/h NorthClear
10pm40°F4°C6 mph9 km/h NorthClear
11pm40°F4°C6 mph9 km/h NorthClear
March 4
12am40°F4°C6 mph9 km/h NorthClear
1am40°F5°C5 mph9 km/h NorthClear
2am44°F6°C5 mph8 km/h NorthClear
3am49°F9°C3 mph6 km/h NortheastClear
4am53°F12°C3 mph4 km/h NortheastClear
5am55°F13°C3 mph4 km/h EastClear
6am57°F14°C3 mph4 km/h SoutheastMostly Clear
DateLowHighWindDayNight
March 340°F4°C58°F15°C3 mph4 km/h from EastClearClear
March 443°F6°C58°F15°C2 mph3 km/h from SouthMostly ClearClear
March 546°F8°C59°F15°C2 mph4 km/h from SoutheastClearClear
March 646°F8°C59°F15°C2 mph4 km/h from SoutheastMostly ClearPartly Cloudy
March 746°F8°C58°F14°C2 mph4 km/h from SouthMostly CloudyPartly Cloudy
March 847°F8°C56°F13°C4 mph7 km/h from SoutheastMostly CloudyRain
March 951°F11°C55°F13°C8 mph13 km/h from SouthRainRain

Yes

Low of 44°F7°C, High of 58°F15°C
Wind: 2 mph3 km/h
Precipitation: None

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