Yes

you do need a jacket based on the weather in Klemzig SA 5087, Australia 1 second ago

Why? Because it's cool. Pleasantly cool, but cool!
55°F13°C & Cloudy

Wind is 6 mph9 km/h from the Northwest, gusting to 14 mph23 km/h
July 16
5am54°F12°C5 mph9 km/h NorthwestCloudy
6am53°F12°C5 mph8 km/h NorthwestMostly Cloudy
7am51°F11°C6 mph9 km/h NorthMostly Cloudy
8am50°F10°C6 mph9 km/h NorthMostly Cloudy
9am50°F10°C6 mph10 km/h NorthMostly Cloudy
10am49°F10°C6 mph9 km/h NorthPartly Cloudy
11am49°F9°C6 mph9 km/h NorthPartly Cloudy
12pm49°F9°C6 mph10 km/h NorthPartly Cloudy
1pm49°F9°C6 mph10 km/h NorthPartly Cloudy
2pm49°F9°C6 mph10 km/h NorthMostly Cloudy
3pm48°F9°C5 mph9 km/h NorthMostly Cloudy
4pm49°F9°C5 mph9 km/h NorthDrizzle
DateLowHighWindDayNight
July 1549°F9°C60°F15°C6 mph9 km/h from NorthwestMostly CloudyRain
July 1644°F7°C58°F15°C5 mph8 km/h from SouthwestRainMostly Clear
July 1743°F6°C58°F14°C6 mph9 km/h from NorthMostly ClearClear
July 1846°F8°C58°F14°C12 mph19 km/h from NorthwestDrizzleMostly Cloudy
July 1945°F7°C58°F14°C5 mph8 km/h from NorthPartly CloudyMostly Cloudy
July 2049°F10°C60°F15°C15 mph24 km/h from NorthMostly CloudyRain
July 2147°F8°C55°F13°C12 mph19 km/h from NorthwestDrizzleDrizzle

Yes

Low of 44°F7°C, High of 58°F15°C
Wind: 5 mph8 km/h
Precipitation: 57% rain

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