Yes

you do need a jacket based on the weather in Subiaco WA 6008, Australia 1 second ago

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

Wind is 7 mph12 km/h from the Southwest, gusting to 16 mph25 km/h
September 15
8am55°F13°C7 mph12 km/h SouthPartly Cloudy
9am54°F12°C6 mph10 km/h SouthPartly Cloudy
10am53°F11°C5 mph7 km/h SouthPartly Cloudy
11am52°F11°C4 mph6 km/h SoutheastPartly Cloudy
12pm50°F10°C3 mph6 km/h SoutheastPartly Cloudy
1pm50°F10°C3 mph5 km/h EastPartly Cloudy
2pm49°F9°C2 mph4 km/h EastPartly Cloudy
3pm49°F9°C3 mph5 km/h EastPartly Cloudy
4pm48°F9°C3 mph5 km/h EastPartly Cloudy
5pm47°F9°C3 mph6 km/h NortheastPartly Cloudy
6pm47°F8°C4 mph6 km/h NortheastPartly Cloudy
7pm47°F8°C4 mph7 km/h NortheastPartly Cloudy
DateLowHighWindDayNight
September 1450°F10°C61°F16°C12 mph19 km/h from SouthwestMostly CloudyPartly Cloudy
September 1547°F8°C64°F18°C7 mph11 km/h from NorthwestPartly CloudyDrizzle
September 1653°F12°C64°F18°C11 mph18 km/h from WestRainPartly Cloudy
September 1750°F10°C64°F18°C7 mph12 km/h from SouthwestPartly CloudyPartly Cloudy
September 1851°F10°C67°F19°C6 mph10 km/h from SouthwestPartly CloudyClear
September 1952°F11°C72°F22°C5 mph9 km/h from SoutheastMostly ClearClear
September 2055°F13°C78°F25°C7 mph11 km/h from SoutheastClearClear

Yes

Low of 46°F8°C, High of 64°F18°C
Wind: 7 mph11 km/h
Precipitation: 9% rain

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