Yes

you do need a jacket based on the weather in Sydney NSW, Australia 5 minutes ago

Why? Because it's super windy outside!
80°F27°C & Cloudy

Wind is 14 mph22 km/h from the Northwest, gusting to 29 mph47 km/h
September 16
1am80°F27°C13 mph22 km/h NorthwestMostly Cloudy
2am80°F26°C12 mph20 km/h NorthwestMostly Cloudy
3am78°F25°C12 mph19 km/h NorthwestMostly Cloudy
4am76°F24°C11 mph18 km/h NorthMostly Cloudy
5am73°F23°C11 mph18 km/h NorthMostly Cloudy
6am72°F22°C11 mph18 km/h NorthMostly Cloudy
7am71°F21°C11 mph18 km/h NorthMostly Cloudy
8am70°F21°C11 mph18 km/h NorthMostly Cloudy
9am69°F20°C9 mph14 km/h NorthwestMostly Cloudy
10am68°F20°C7 mph12 km/h NorthwestMostly Cloudy
11am67°F19°C6 mph10 km/h NorthwestMostly Cloudy
12pm66°F19°C6 mph9 km/h NorthwestMostly Cloudy
DateLowHighWindDayNight
September 1564°F18°C80°F27°C11 mph17 km/h from NorthMostly CloudyMostly Cloudy
September 1655°F13°C75°F24°C8 mph12 km/h from SouthwestMostly ClearClear
September 1750°F10°C69°F21°C6 mph10 km/h from NortheastClearClear
September 1852°F11°C76°F24°C7 mph12 km/h from NorthMostly ClearMostly Cloudy
September 1951°F11°C67°F19°C13 mph21 km/h from WestClearClear
September 2048°F9°C68°F20°C10 mph17 km/h from WestMostly ClearMostly Clear
September 2150°F10°C69°F21°C8 mph13 km/h from WestMostly ClearMostly Clear

Yes

Low of 55°F13°C, High of 74°F24°C
Wind: 8 mph12 km/h
Precipitation: None

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