Yes

you do need a jacket based on the weather in Sydney NSW, Australia 10 minutes ago

Why? Because it's so windy, even the squirrels are holding onto branches for dear life!
63°F17°C & Mostly Clear

Wind is 9 mph15 km/h from the South, gusting to 22 mph36 km/h
September 22
11pm64°F18°C10 mph15 km/h SouthClear
September 23
12am64°F18°C10 mph15 km/h SouthClear
1am64°F18°C9 mph15 km/h SouthClear
2am64°F18°C9 mph14 km/h SouthClear
3am62°F17°C7 mph11 km/h SouthClear
4am61°F16°C4 mph7 km/h SouthClear
5am59°F15°C3 mph4 km/h SouthClear
6am58°F14°C2 mph3 km/h WestClear
7am56°F14°C4 mph6 km/h NorthwestClear
8am55°F13°C4 mph7 km/h NorthwestClear
9am54°F12°C5 mph8 km/h WestClear
10am52°F11°C5 mph8 km/h NorthwestClear
DateLowHighWindDayNight
September 2247°F8°C64°F18°C7 mph12 km/h from SouthClearClear
September 2349°F10°C76°F24°C9 mph15 km/h from WestMostly ClearMostly Cloudy
September 2452°F11°C75°F24°C10 mph16 km/h from WestPartly CloudyPartly Cloudy
September 2557°F14°C80°F27°C13 mph21 km/h from NorthwestMostly CloudyMostly Cloudy
September 2662°F17°C81°F27°C9 mph14 km/h from NorthwestMostly CloudyPartly Cloudy
September 2761°F16°C76°F25°C11 mph18 km/h from SouthPartly CloudyDrizzle
September 2859°F15°C72°F22°C7 mph11 km/h from EastPartly CloudyPartly Cloudy

Yes

Low of 49°F10°C, High of 76°F25°C
Wind: 9 mph15 km/h
Precipitation: None

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