Yes

you do need a jacket based on the weather in Northam WA 6401, Australia 1 second ago

Why? Because too cold for just a hoodie, too warm for a parka!
44°F7°C & Mostly Clear

Wind is 6 mph10 km/h from the Northwest, gusting to 14 mph23 km/h
September 16
4pm44°F7°C7 mph11 km/h NorthwestMostly Clear
5pm45°F7°C7 mph11 km/h NorthwestMostly Clear
6pm46°F8°C8 mph13 km/h NorthwestMostly Clear
7pm48°F9°C9 mph14 km/h NorthwestMostly Clear
8pm53°F12°C11 mph18 km/h NorthwestMostly Clear
9pm57°F14°C12 mph20 km/h NorthwestPartly Cloudy
10pm61°F16°C14 mph22 km/h NorthwestMostly Cloudy
11pm62°F17°C15 mph25 km/h NorthwestWindy
September 17
12am62°F16°C14 mph22 km/h WestRain
1am62°F16°C13 mph21 km/h WestRain
2am62°F17°C13 mph20 km/h WestMostly Cloudy
3am62°F17°C13 mph20 km/h WestMostly Cloudy
DateLowHighWindDayNight
September 1644°F7°C63°F17°C12 mph19 km/h from WestRainPartly Cloudy
September 1743°F6°C64°F18°C9 mph14 km/h from SouthwestPartly CloudyMostly Clear
September 1839°F4°C67°F19°C5 mph8 km/h from SouthPartly CloudyMostly Clear
September 1944°F7°C71°F22°C7 mph11 km/h from SoutheastClearClear
September 2048°F9°C76°F24°C9 mph15 km/h from SoutheastClearClear
September 2150°F10°C78°F25°C11 mph18 km/h from EastClearClear
September 2253°F11°C80°F27°C9 mph14 km/h from NortheastClearClear

Yes

Low of 43°F6°C, High of 64°F18°C
Wind: 9 mph14 km/h
Precipitation: None

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