Yes

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

Why? Because it's so windy, your hat has officially retired from your head!
71°F21°C & Mostly Clear

Wind is 10 mph16 km/h from the Southwest, gusting to 24 mph38 km/h
October 15
8am70°F21°C10 mph16 km/h SouthwestMostly Clear
9am69°F20°C9 mph15 km/h SouthwestMostly Clear
10am67°F19°C8 mph13 km/h SouthwestMostly Clear
11am65°F19°C7 mph11 km/h SouthwestClear
12pm64°F18°C5 mph8 km/h SouthwestMostly Clear
1pm63°F17°C4 mph6 km/h SouthwestMostly Clear
2pm62°F17°C3 mph5 km/h SouthwestMostly Clear
3pm62°F16°C3 mph4 km/h SouthwestMostly Clear
4pm61°F16°C2 mph3 km/h WestMostly Clear
5pm60°F15°C1 mph2 km/h SoutheastPartly Cloudy
6pm59°F15°C2 mph3 km/h EastMostly Clear
7pm58°F14°C3 mph4 km/h NortheastMostly Clear
DateLowHighWindDayNight
October 1457°F14°C71°F22°C8 mph13 km/h from SouthwestMostly ClearMostly Clear
October 1556°F13°C75°F24°C7 mph11 km/h from SouthwestPartly CloudyMostly Clear
October 1657°F14°C81°F27°C8 mph13 km/h from NorthwestMostly ClearMostly Cloudy
October 1758°F14°C69°F21°C13 mph21 km/h from WestPartly CloudyPartly Cloudy
October 1853°F12°C65°F18°C11 mph17 km/h from WestDrizzlePartly Cloudy
October 1950°F10°C67°F19°C10 mph17 km/h from SouthwestDrizzleClear
October 2050°F10°C73°F23°C7 mph12 km/h from SouthMostly ClearClear

Yes

Low of 56°F14°C, High of 74°F24°C
Wind: 7 mph11 km/h
Precipitation: None

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