Yes

you do need a jacket based on the weather in Elizabeth South SA 5112, Australia 1 second ago

Why? Because it's pretty chilly!
52°F11°C & Partly Cloudy

Wind is 6 mph10 km/h from the Northeast, gusting to 14 mph22 km/h
July 5
9am52°F11°C6 mph10 km/h NortheastPartly Cloudy
10am51°F11°C7 mph11 km/h NortheastMostly Cloudy
11am51°F10°C7 mph11 km/h NorthDrizzle
12pm50°F10°C6 mph9 km/h NortheastDrizzle
1pm50°F10°C5 mph8 km/h NortheastDrizzle
2pm49°F10°C4 mph7 km/h NortheastMostly Cloudy
3pm49°F10°C3 mph6 km/h NortheastMostly Cloudy
4pm49°F9°C3 mph5 km/h EastPartly Cloudy
5pm48°F9°C3 mph5 km/h EastPartly Cloudy
6pm48°F9°C3 mph4 km/h EastPartly Cloudy
7pm49°F9°C2 mph3 km/h EastPartly Cloudy
8pm52°F11°C1 mph2 km/h SoutheastMostly Clear
DateLowHighWindDayNight
July 451°F11°C62°F16°C7 mph11 km/h from NorthPartly CloudyMostly Cloudy
July 545°F7°C60°F16°C4 mph6 km/h from SouthwestMostly ClearPartly Cloudy
July 645°F7°C60°F15°C9 mph15 km/h from NorthCloudyWindy
July 749°F9°C57°F14°C19 mph30 km/h from WestRainDrizzle
July 848°F9°C55°F13°C15 mph25 km/h from NorthwestRainRain
July 946°F8°C54°F12°C12 mph20 km/h from SouthwestDrizzleDrizzle
July 1045°F7°C60°F16°C5 mph7 km/h from WestDrizzleMostly Clear

Yes

Low of 46°F8°C, High of 60°F16°C
Wind: 4 mph6 km/h
Precipitation: None

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