Yes

you do need a jacket based on the weather in Perth WA, Australia 28 minutes ago

Why? Because a jacket will keep you cozy, but you won't break a seat!
58°F15°C & Partly Cloudy

Wind is 6 mph10 km/h from the Southwest, gusting to 17 mph27 km/h
September 18
8am57°F14°C5 mph9 km/h SouthwestPartly Cloudy
9am57°F14°C5 mph8 km/h SouthwestPartly Cloudy
10am56°F14°C4 mph7 km/h SouthwestMostly Cloudy
11am56°F13°C4 mph7 km/h SouthwestPartly Cloudy
12pm56°F13°C4 mph6 km/h SouthwestMostly Cloudy
1pm55°F13°C3 mph5 km/h SouthwestMostly Cloudy
2pm54°F12°C3 mph5 km/h SouthwestMostly Cloudy
3pm54°F12°C3 mph5 km/h SouthMostly Cloudy
4pm54°F12°C2 mph3 km/h SouthCloudy
5pm53°F12°C3 mph5 km/h EastMostly Cloudy
6pm53°F12°C3 mph4 km/h EastDrizzle
7pm53°F12°C2 mph4 km/h NortheastPartly Cloudy
DateLowHighWindDayNight
September 1752°F11°C64°F18°C8 mph12 km/h from SouthwestPartly CloudyDrizzle
September 1853°F12°C67°F20°C6 mph10 km/h from SouthwestPartly CloudyMostly Clear
September 1951°F11°C72°F22°C6 mph9 km/h from SouthMostly ClearClear
September 2053°F12°C79°F26°C6 mph10 km/h from SoutheastClearClear
September 2156°F13°C81°F27°C8 mph12 km/h from EastClearClear
September 2257°F14°C82°F28°C6 mph10 km/h from NortheastClearClear
September 2357°F14°C82°F28°C6 mph9 km/h from NorthClearClear

Yes

Low of 53°F12°C, High of 67°F20°C
Wind: 6 mph10 km/h
Precipitation: None

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