Yes

you do need a jacket based on the weather in Warriewood NSW 2102, Australia 1 second ago

Why? Because it's fairly windy outside!
63°F17°C & Mostly Clear

Wind is 12 mph20 km/h from the South, gusting to 25 mph40 km/h
November 9
8am63°F17°C13 mph20 km/h SouthMostly Clear
9am62°F17°C11 mph18 km/h SouthMostly Clear
10am61°F16°C8 mph13 km/h SouthMostly Clear
11am60°F16°C6 mph10 km/h SouthPartly Cloudy
12pm59°F15°C5 mph8 km/h SouthPartly Cloudy
1pm59°F15°C4 mph6 km/h SouthPartly Cloudy
2pm58°F14°C4 mph7 km/h SouthPartly Cloudy
3pm57°F14°C3 mph6 km/h SouthwestMostly Cloudy
4pm56°F13°C5 mph8 km/h SouthwestPartly Cloudy
5pm56°F13°C5 mph7 km/h SouthwestPartly Cloudy
6pm55°F13°C4 mph6 km/h SouthwestMostly Clear
7pm55°F13°C4 mph6 km/h WestMostly Clear
DateLowHighWindDayNight
November 859°F15°C67°F20°C13 mph22 km/h from SouthMostly ClearPartly Cloudy
November 955°F13°C72°F22°C8 mph13 km/h from NortheastMostly ClearMostly Clear
November 1053°F12°C80°F26°C7 mph11 km/h from WestMostly ClearClear
November 1148°F9°C71°F22°C8 mph14 km/h from SoutheastClearClear
November 1251°F11°C79°F26°C7 mph11 km/h from NortheastPartly CloudyMostly Cloudy
November 1360°F16°C74°F23°C7 mph12 km/h from SoutheastRainThunderstorms
November 1463°F17°C82°F28°C11 mph17 km/h from NorthwestMostly CloudyMostly Cloudy

Yes

Low of 55°F13°C, High of 72°F22°C
Wind: 8 mph13 km/h
Precipitation: None

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