Yes

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

Why? Because the air feels like the cozy middle ground between summer and winter and it's fairly windy outside!
52°F11°C & Mostly Clear

Wind is 9 mph15 km/h from the West, gusting to 19 mph31 km/h
September 15
6am52°F11°C10 mph16 km/h WestMostly Clear
7am52°F11°C10 mph17 km/h WestPartly Cloudy
8am52°F11°C10 mph17 km/h WestMostly Clear
9am52°F11°C10 mph16 km/h WestMostly Clear
10am52°F11°C10 mph16 km/h WestPartly Cloudy
11am52°F11°C10 mph16 km/h WestPartly Cloudy
12pm52°F11°C11 mph17 km/h WestPartly Cloudy
1pm53°F12°C11 mph18 km/h WestPartly Cloudy
2pm53°F12°C12 mph19 km/h WestPartly Cloudy
3pm54°F12°C11 mph18 km/h SouthwestPartly Cloudy
4pm57°F14°C11 mph18 km/h SouthwestPartly Cloudy
5pm59°F15°C13 mph21 km/h SouthwestPartly Cloudy
DateLowHighWindDayNight
September 1446°F8°C61°F16°C13 mph20 km/h from SouthwestPartly CloudyPartly Cloudy
September 1552°F11°C66°F19°C15 mph23 km/h from SouthwestMostly ClearMostly Cloudy
September 1651°F11°C64°F18°C13 mph22 km/h from WestMostly CloudyDrizzle
September 1750°F10°C61°F16°C16 mph26 km/h from NorthwestRainMostly Clear
September 1841°F5°C61°F16°C9 mph15 km/h from SouthwestMostly ClearMostly Clear
September 1934°F1°C60°F16°C6 mph10 km/h from NorthwestMostly ClearMostly Cloudy
September 2046°F8°C63°F17°C14 mph22 km/h from NorthRainThunderstorms

Yes

Low of 52°F11°C, High of 65°F19°C
Wind: 15 mph23 km/h
Precipitation: 11% rain

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