Yes

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

Why? Because it's so windy, your hat is now someone else's problem, two cities away!
67°F19°C & Partly Cloudy

Wind is 14 mph22 km/h from the North, gusting to 27 mph44 km/h
September 11
11pm68°F20°C15 mph24 km/h NorthMostly Cloudy
September 12
12am71°F22°C16 mph26 km/h NorthWindy
1am73°F23°C16 mph26 km/h NorthWindy
2am74°F23°C16 mph25 km/h NorthwestWindy
3am74°F23°C15 mph24 km/h NorthwestMostly Cloudy
4am73°F23°C13 mph21 km/h NorthwestPartly Cloudy
5am71°F21°C9 mph14 km/h NorthwestPartly Cloudy
6am64°F18°C6 mph10 km/h NorthwestClear
7am59°F15°C5 mph9 km/h NorthClear
8am56°F14°C5 mph8 km/h NorthClear
9am54°F12°C5 mph7 km/h NorthMostly Clear
10am53°F12°C5 mph8 km/h NorthPartly Cloudy
DateLowHighWindDayNight
September 1142°F6°C74°F23°C12 mph19 km/h from NorthPartly CloudyPartly Cloudy
September 1252°F11°C71°F22°C15 mph24 km/h from NorthwestRainDrizzle
September 1348°F9°C62°F17°C24 mph39 km/h from WestDrizzlePartly Cloudy
September 1441°F5°C59°F15°C12 mph20 km/h from SouthwestMostly CloudyMostly Clear
September 1538°F3°C62°F17°C7 mph11 km/h from NorthwestPartly CloudyMostly Clear
September 1644°F7°C65°F19°C14 mph22 km/h from NorthwestPartly CloudyDrizzle
September 1743°F6°C63°F17°C11 mph18 km/h from SouthwestPartly CloudyClear

Yes

Low of 52°F11°C, High of 72°F22°C
Wind: 15 mph24 km/h
Precipitation: 56% rain

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