Yes

you do need a jacket based on the weather in Buenos Aires, Argentina 14 seconds ago

Why? Because it's not very warm out!
57°F14°C & Clear

Wind is 6 mph9 km/h from the East, gusting to 11 mph17 km/h
August 27
11pm57°F14°C5 mph8 km/h EastClear
August 28
12am56°F13°C5 mph8 km/h NortheastClear
1am55°F13°C5 mph8 km/h NortheastClear
2am54°F12°C5 mph9 km/h NortheastClear
3am54°F12°C5 mph9 km/h NortheastClear
4am53°F12°C5 mph9 km/h NortheastClear
5am53°F12°C5 mph9 km/h NortheastClear
6am53°F12°C6 mph9 km/h NortheastClear
7am54°F12°C6 mph10 km/h NortheastClear
8am57°F14°C6 mph10 km/h NortheastClear
9am59°F15°C7 mph11 km/h NortheastClear
10am62°F17°C6 mph10 km/h NortheastClear
DateLowHighWindDayNight
August 2654°F12°C68°F20°C5 mph8 km/h from EastClearClear
August 2753°F12°C68°F20°C6 mph10 km/h from NortheastClearPartly Cloudy
August 2856°F13°C69°F20°C9 mph15 km/h from EastPartly CloudyPartly Cloudy
August 2959°F15°C69°F21°C11 mph18 km/h from EastMostly CloudyRain
August 3061°F16°C67°F19°C14 mph23 km/h from EastRainThunderstorms
August 3156°F13°C67°F19°C13 mph20 km/h from NorthRainMostly Cloudy
September 153°F12°C64°F18°C6 mph9 km/h from EastMostly CloudyMostly Cloudy

Yes

Low of 53°F12°C, High of 68°F20°C
Wind: 6 mph10 km/h
Precipitation: None

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