Yes

you do need a jacket based on the weather in Cluj-Napoca, Romania 1 second ago

Why? Because you're not freezing, but you’ll definitely start complaining if it lasts much longer!
46°F8°C & Clear

Wind is 2 mph3 km/h from the Southwest, gusting to 4 mph6 km/h
September 18
11pm46°F8°C2 mph3 km/h SouthwestMostly Clear
September 19
12am47°F8°C2 mph3 km/h SouthwestMostly Clear
1am50°F10°C1 mph2 km/h SouthPartly Cloudy
2am54°F12°C1 mph2 km/h SoutheastPartly Cloudy
3am59°F15°C1 mph2 km/h EastPartly Cloudy
4am63°F17°C2 mph4 km/h EastPartly Cloudy
5am65°F18°C3 mph4 km/h NortheastPartly Cloudy
6am67°F20°C3 mph5 km/h NorthPartly Cloudy
7am69°F21°C4 mph6 km/h NorthPartly Cloudy
8am70°F21°C4 mph7 km/h NorthPartly Cloudy
9am71°F22°C5 mph8 km/h NorthPartly Cloudy
10am71°F22°C5 mph8 km/h NorthPartly Cloudy
DateLowHighWindDayNight
September 1846°F8°C71°F22°C3 mph5 km/h from NorthPartly CloudyClear
September 1951°F10°C76°F25°C3 mph4 km/h from EastClearClear
September 2053°F12°C79°F26°C6 mph9 km/h from SoutheastClearClear
September 2153°F12°C79°F26°C5 mph8 km/h from SoutheastClearClear
September 2254°F12°C78°F26°C3 mph5 km/h from EastClearMostly Clear
September 2354°F12°C78°F25°C3 mph5 km/h from EastMostly ClearMostly Cloudy
September 2457°F14°C69°F20°C6 mph9 km/h from SoutheastRainCloudy

Yes

Low of 51°F11°C, High of 76°F25°C
Wind: 3 mph4 km/h
Precipitation: None

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