Yes

you do need a jacket based on the weather in Taperoo SA 5017, Australia 1 second ago

Why? Because it's cool. Pleasantly cool, but cool and it's on the windy side!
52°F11°C & Partly Cloudy

Wind is 12 mph20 km/h from the South, gusting to 21 mph33 km/h
November 7
9pm53°F12°C12 mph20 km/h SouthMostly Clear
10pm55°F13°C13 mph21 km/h SouthPartly Cloudy
11pm58°F14°C14 mph23 km/h SouthMostly Clear
November 8
12am60°F15°C15 mph25 km/h SouthWindy
1am62°F16°C16 mph25 km/h SouthWindy
2am63°F17°C16 mph25 km/h SouthWindy
3am63°F17°C16 mph26 km/h SouthWindy
4am64°F18°C16 mph26 km/h SouthWindy
5am64°F18°C17 mph28 km/h SouthWindy
6am63°F17°C16 mph26 km/h SouthWindy
7am63°F17°C16 mph25 km/h SouthWindy
8am61°F16°C15 mph25 km/h SouthWindy
DateLowHighWindDayNight
November 752°F11°C64°F18°C15 mph25 km/h from SouthWindyMostly Clear
November 850°F10°C65°F19°C10 mph17 km/h from SouthwestPartly CloudyPartly Cloudy
November 951°F10°C64°F18°C9 mph14 km/h from WestMostly CloudyWindy
November 1050°F10°C63°F17°C11 mph18 km/h from SouthwestMostly ClearClear
November 1147°F8°C71°F22°C5 mph9 km/h from WestClearMostly Cloudy
November 1252°F11°C73°F23°C5 mph9 km/h from SouthMostly CloudyMostly Cloudy
November 1358°F14°C74°F24°C7 mph12 km/h from SoutheastPartly CloudyMostly Clear

Yes

Low of 50°F10°C, High of 65°F19°C
Wind: 10 mph17 km/h
Precipitation: None

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