Yes

you do need a jacket based on the weather in Punta Arenas, Magallanes and Chilean Antarctica, Chile 1 second ago

Why? Because it's quite chilly!
44°F7°C & Cloudy

Wind is 11 mph18 km/h from the West, gusting to 16 mph26 km/h
August 31
6pm44°F6°C11 mph18 km/h NorthwestPartly Cloudy
7pm42°F6°C11 mph17 km/h NorthwestMostly Clear
8pm41°F5°C11 mph18 km/h NorthwestClear
9pm40°F4°C12 mph20 km/h NorthwestClear
10pm39°F4°C14 mph23 km/h NorthwestClear
11pm38°F3°C15 mph25 km/h NorthwestWindy
September 1
12am38°F3°C16 mph26 km/h NorthwestWindy
1am37°F3°C16 mph26 km/h NorthwestWindy
2am37°F3°C15 mph24 km/h NorthwestClear
3am37°F3°C14 mph23 km/h NorthwestMostly Clear
4am36°F2°C14 mph23 km/h NorthwestMostly Clear
5am37°F3°C14 mph23 km/h NorthwestMostly Clear
DateLowHighWindDayNight
August 3034°F1°C47°F8°C8 mph13 km/h from NorthwestMostly CloudyMostly Clear
August 3135°F2°C43°F6°C18 mph28 km/h from NorthwestDrizzleDrizzle
September 132°F-0°C39°F4°C16 mph26 km/h from WestFlurriesWindy
September 231°F-1°C42°F5°C17 mph28 km/h from SouthwestWindyPartly Cloudy
September 337°F3°C47°F9°C14 mph22 km/h from WestPartly CloudyWindy
September 440°F4°C47°F9°C19 mph30 km/h from WestDrizzleDrizzle
September 540°F5°C49°F9°C11 mph18 km/h from WestMostly CloudyMostly Cloudy

Yes

Low of 35°F2°C, High of 44°F7°C
Wind: 18 mph28 km/h
Precipitation: 59% rain

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