Yes

you do need a jacket based on the weather in Winston Hills NSW 2153, Australia 1 second ago

Why? Because it's cool. Pleasantly cool, but cool!
56°F14°C & Clear

Wind is 3 mph5 km/h from the Northwest, gusting to 10 mph16 km/h
September 6
7pm60°F15°C4 mph6 km/h NorthClear
8pm66°F19°C5 mph8 km/h NorthClear
9pm71°F22°C6 mph10 km/h NorthClear
10pm75°F24°C8 mph12 km/h NorthClear
11pm77°F25°C9 mph14 km/h NorthClear
September 7
12am78°F26°C9 mph14 km/h NorthClear
1am78°F26°C9 mph14 km/h NorthMostly Clear
2am77°F25°C9 mph14 km/h NorthMostly Clear
3am75°F24°C8 mph13 km/h NorthPartly Cloudy
4am71°F22°C8 mph12 km/h NorthPartly Cloudy
5am68°F20°C7 mph11 km/h NorthMostly Clear
6am66°F19°C6 mph9 km/h NorthMostly Clear
DateLowHighWindDayNight
September 647°F8°C78°F26°C7 mph11 km/h from NorthMostly ClearMostly Clear
September 760°F15°C83°F28°C10 mph16 km/h from NorthwestMostly ClearPartly Cloudy
September 859°F15°C70°F21°C6 mph10 km/h from NorthRainRain
September 951°F11°C67°F19°C7 mph12 km/h from WestRainDrizzle
September 1049°F10°C63°F17°C9 mph15 km/h from SouthwestDrizzleMostly Clear
September 1146°F8°C67°F20°C4 mph6 km/h from SouthwestMostly ClearMostly Clear
September 1246°F8°C70°F21°C5 mph8 km/h from NorthMostly ClearClear

No

Low of 60°F16°C, High of 83°F29°C
Wind: 10 mph16 km/h
Precipitation: 27% rain

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