Yes

you do need a jacket based on the weather in Warkworth, New Zealand 1 second ago

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

Wind is 6 mph9 km/h from the West, gusting to 12 mph20 km/h
September 16
12pm55°F13°C6 mph9 km/h WestMostly Cloudy
1pm55°F13°C6 mph10 km/h WestCloudy
2pm55°F13°C6 mph10 km/h WestCloudy
3pm56°F13°C7 mph11 km/h WestCloudy
4pm58°F14°C8 mph13 km/h WestMostly Cloudy
5pm60°F16°C10 mph17 km/h WestMostly Cloudy
6pm62°F17°C12 mph19 km/h WestMostly Cloudy
7pm64°F18°C12 mph20 km/h WestMostly Cloudy
8pm65°F18°C12 mph20 km/h WestMostly Cloudy
9pm66°F19°C13 mph21 km/h WestMostly Cloudy
10pm66°F19°C13 mph21 km/h WestMostly Cloudy
11pm65°F18°C13 mph21 km/h WestMostly Cloudy
DateLowHighWindDayNight
September 1654°F12°C66°F19°C12 mph19 km/h from WestMostly CloudyMostly Cloudy
September 1751°F11°C63°F17°C16 mph25 km/h from NorthwestRainDrizzle
September 1843°F6°C60°F16°C15 mph23 km/h from SouthwestMostly ClearClear
September 1940°F5°C61°F16°C8 mph13 km/h from NortheastPartly CloudyMostly Cloudy
September 2051°F11°C64°F18°C14 mph23 km/h from NorthDrizzleDrizzle
September 2154°F12°C64°F18°C12 mph19 km/h from NorthRainDrizzle
September 2252°F11°C66°F19°C9 mph14 km/h from NorthwestMostly ClearPartly Cloudy

Yes

Low of 51°F11°C, High of 63°F17°C
Wind: 16 mph25 km/h
Precipitation: 67% rain

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