Yes

you do need a jacket based on the weather in Brașov, Romania 1 second ago

Why? Because it's cold. simple as that.
42°F5°C & Cloudy

Wind is 2 mph4 km/h from the W, gusting to 8 mph13 km/h
April 25
8pm42°F5°C3 mph4 km/h WDrizzle
9pm42°F6°C3 mph5 km/h WCloudy
10pm42°F6°C3 mph5 km/h WCloudy
11pm43°F6°C3 mph5 km/h WCloudy
April 26
12am43°F6°C3 mph6 km/h WCloudy
1am44°F7°C4 mph7 km/h WCloudy
2am45°F7°C5 mph7 km/h NWCloudy
3am47°F8°C5 mph8 km/h NWMostly Cloudy
4am48°F9°C5 mph7 km/h NWMostly Cloudy
5am50°F10°C4 mph7 km/h NWMostly Cloudy
6am52°F11°C4 mph6 km/h NWMostly Cloudy
7am54°F12°C3 mph5 km/h NWMostly Cloudy
DateLowHighWindDayNight
April 2542°F5°C58°F14°C4 mph6 km/h from NWMostly CloudyPartly Cloudy
April 2640°F4°C64°F18°C2 mph3 km/h from SEMostly CloudyPartly Cloudy
April 2743°F6°C67°F20°C3 mph5 km/h from NEMostly ClearClear
April 2843°F6°C68°F20°C5 mph8 km/h from NEClearClear
April 2944°F7°C67°F19°C5 mph9 km/h from NEMostly ClearPartly Cloudy
April 3047°F8°C65°F18°C5 mph9 km/h from EPartly CloudyPartly Cloudy
May 148°F9°C67°F19°C4 mph7 km/h from NEPartly CloudyPartly Cloudy

Yes

Low of 39°F4°C, High of 64°F18°C
Wind: 2 mph3 km/h
Precipitation: 2% rain

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