Yes

you do need a jacket based on the weather in Hampstead Gardens SA 5086, Australia 1 second ago

Why? Because it's cool. Pleasantly cool, but cool!
52°F11°C & Mostly Clear

Wind is 3 mph5 km/h from the North, gusting to 6 mph10 km/h
September 18
3pm52°F11°C3 mph5 km/h NorthMostly Clear
4pm51°F11°C4 mph6 km/h NorthwestMostly Clear
5pm52°F11°C5 mph8 km/h NorthwestMostly Cloudy
6pm54°F12°C7 mph11 km/h NorthwestMostly Cloudy
7pm56°F13°C9 mph14 km/h NorthwestPartly Cloudy
8pm58°F15°C11 mph17 km/h WestMostly Clear
9pm61°F16°C14 mph22 km/h WestMostly Clear
10pm62°F17°C14 mph23 km/h WestMostly Clear
11pm63°F17°C16 mph26 km/h WestWindy
September 19
12am63°F17°C16 mph26 km/h WestWindy
1am64°F18°C17 mph27 km/h WestWindy
2am63°F17°C17 mph27 km/h WestWindy
DateLowHighWindDayNight
September 1850°F10°C64°F18°C14 mph23 km/h from WestPartly CloudyRain
September 1948°F9°C58°F14°C11 mph17 km/h from WestMostly CloudyMostly Cloudy
September 2051°F11°C61°F16°C11 mph17 km/h from WestDrizzleMostly Cloudy
September 2146°F8°C62°F17°C8 mph12 km/h from SouthPartly CloudyMostly Clear
September 2241°F5°C62°F17°C6 mph9 km/h from SouthwestPartly CloudyPartly Cloudy
September 2345°F7°C63°F17°C6 mph9 km/h from SouthwestMostly CloudyMostly Cloudy
September 2448°F9°C65°F18°C9 mph14 km/h from WestMostly CloudyMostly Cloudy

Yes

Low of 48°F9°C, High of 58°F15°C
Wind: 11 mph17 km/h
Precipitation: 19% rain

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