Yes

you do need a jacket based on the weather in Greenwood WA 6024, Australia 1 second ago

Why? Because it's on the windy side!
70°F21°C & Mostly Cloudy

Wind is 9 mph15 km/h from the West, gusting to 19 mph31 km/h
October 28
11am69°F21°C10 mph16 km/h WestMostly Cloudy
12pm67°F19°C11 mph18 km/h SouthwestMostly Cloudy
1pm66°F19°C12 mph19 km/h SouthwestMostly Cloudy
2pm65°F18°C12 mph19 km/h SouthwestMostly Cloudy
3pm63°F17°C12 mph19 km/h SouthwestMostly Cloudy
4pm63°F17°C11 mph18 km/h SouthwestPartly Cloudy
5pm62°F17°C11 mph17 km/h WestPartly Cloudy
6pm61°F16°C8 mph14 km/h WestPartly Cloudy
7pm61°F16°C8 mph13 km/h WestPartly Cloudy
8pm61°F16°C7 mph11 km/h WestMostly Cloudy
9pm61°F16°C7 mph12 km/h NorthwestMostly Cloudy
10pm62°F17°C8 mph13 km/h NorthwestCloudy
DateLowHighWindDayNight
October 2761°F16°C91°F33°C9 mph15 km/h from NorthMostly ClearRain
October 2857°F14°C69°F20°C14 mph22 km/h from WestRainPartly Cloudy
October 2956°F13°C71°F22°C10 mph15 km/h from WestPartly CloudyMostly Clear
October 3055°F13°C72°F22°C14 mph22 km/h from NorthwestPartly CloudyDrizzle
October 3153°F12°C68°F20°C15 mph24 km/h from SouthwestPartly CloudyClear
November 147°F8°C75°F24°C7 mph12 km/h from SouthClearMostly Clear
November 254°F12°C85°F30°C11 mph18 km/h from NortheastMostly ClearMostly Clear

Yes

Low of 57°F14°C, High of 69°F21°C
Wind: 14 mph22 km/h
Precipitation: 56% rain

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