Yes

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

Why? Because it's quite chilly.
49°F10°C & Clear

Wind is 4 mph6 km/h from the SE, gusting to 6 mph10 km/h
July 14
4pm49°F9°C4 mph7 km/h SEClear
5pm48°F9°C4 mph7 km/h SEClear
6pm48°F9°C4 mph7 km/h SEClear
7pm47°F9°C4 mph7 km/h SEClear
8pm49°F9°C4 mph6 km/h EClear
9pm52°F11°C4 mph6 km/h EClear
10pm57°F14°C4 mph7 km/h EClear
11pm61°F16°C5 mph7 km/h EClear
July 15
12am64°F18°C4 mph7 km/h EClear
1am67°F19°C4 mph7 km/h EClear
2am68°F20°C4 mph7 km/h EClear
3am69°F21°C4 mph7 km/h EClear
DateLowHighWindDayNight
July 1447°F9°C69°F21°C4 mph7 km/h from EClearClear
July 1551°F10°C70°F21°C9 mph15 km/h from NEClearClear
July 1655°F13°C70°F21°C13 mph20 km/h from NMostly CloudyThunderstorms
July 1751°F10°C60°F16°C9 mph14 km/h from SWRainDrizzle
July 1848°F9°C59°F15°C6 mph9 km/h from SMostly ClearPartly Cloudy
July 1947°F8°C64°F18°C11 mph17 km/h from NWMostly CloudyPartly Cloudy
July 2056°F14°C65°F19°C14 mph22 km/h from NWMostly CloudyRain

Yes

Low of 51°F11°C, High of 71°F22°C
Wind: 9 mph15 km/h
Precipitation: None

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