Yes

you do need a jacket based on the weather in Tea Tree Gully SA 5091, Australia 1 second ago

Why? Because the air feels like the cozy middle ground between summer and winter!
59°F15°C & Clear

Wind is 6 mph10 km/h from the East, gusting to 14 mph22 km/h
December 30
3pm59°F15°C6 mph10 km/h EastClear
4pm63°F17°C6 mph10 km/h EastClear
5pm69°F20°C5 mph8 km/h EastClear
6pm74°F23°C2 mph3 km/h EastClear
7pm79°F26°C3 mph4 km/h NorthwestClear
8pm82°F28°C5 mph8 km/h WestClear
9pm84°F29°C7 mph11 km/h WestClear
10pm86°F30°C8 mph13 km/h WestClear
11pm86°F30°C9 mph15 km/h WestClear
December 31
12am86°F30°C9 mph15 km/h WestClear
1am85°F30°C9 mph15 km/h SouthwestClear
2am84°F29°C9 mph15 km/h SouthwestClear
DateLowHighWindDayNight
December 3059°F15°C86°F30°C7 mph11 km/h from SouthwestClearClear
December 3157°F14°C82°F28°C8 mph13 km/h from SouthClearMostly Clear
January 156°F13°C81°F27°C8 mph12 km/h from SoutheastClearClear
January 261°F16°C92°F33°C6 mph10 km/h from NorthwestClearPartly Cloudy
January 370°F21°C93°F34°C6 mph10 km/h from NorthwestCloudyMostly Cloudy
January 465°F18°C84°F29°C8 mph13 km/h from WestMostly CloudyRain
January 559°F15°C72°F22°C8 mph13 km/h from SouthRainMostly Clear

Yes

Low of 57°F14°C, High of 82°F28°C
Wind: 8 mph13 km/h
Precipitation: None

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