Yes

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

Why? Because it's not very warm out!
58°F15°C & Partly Cloudy

Wind is 6 mph10 km/h from the South, gusting to 16 mph25 km/h
July 29
6am57°F14°C6 mph10 km/h SouthPartly Cloudy
7am55°F13°C6 mph9 km/h SouthMostly Clear
8am53°F12°C5 mph8 km/h SouthMostly Clear
9am51°F11°C5 mph8 km/h SouthMostly Clear
10am50°F10°C5 mph8 km/h SouthMostly Clear
11am48°F9°C4 mph7 km/h SoutheastMostly Clear
12pm47°F9°C4 mph7 km/h SoutheastClear
1pm47°F8°C4 mph6 km/h SoutheastClear
2pm46°F8°C4 mph6 km/h SoutheastClear
3pm45°F7°C3 mph5 km/h SoutheastClear
4pm44°F7°C3 mph5 km/h SoutheastClear
5pm44°F7°C3 mph5 km/h EastMostly Clear
DateLowHighWindDayNight
July 2842°F5°C60°F15°C7 mph11 km/h from SouthMostly ClearMostly Clear
July 2944°F7°C63°F17°C4 mph7 km/h from NortheastMostly ClearMostly Clear
July 3044°F7°C65°F19°C5 mph9 km/h from NorthClearClear
July 3148°F9°C66°F19°C11 mph17 km/h from NorthClearMostly Clear
August 153°F12°C59°F15°C11 mph18 km/h from NorthwestThunderstormsDrizzle
August 252°F11°C58°F14°C18 mph29 km/h from WestRainDrizzle
August 351°F11°C60°F16°C6 mph10 km/h from SouthwestDrizzleDrizzle

Yes

Low of 44°F7°C, High of 63°F17°C
Wind: 4 mph7 km/h
Precipitation: None

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