Yes

you do need a jacket based on the weather in Willetton WA 6155, Australia 1 second ago

Why? Because the rain is so heavy, you’re basically showering fully dressed. and it's cool. Pleasantly cool, but cool!
50°F10°C & Heavy Rain

Wind is 9 mph15 km/h from the Southwest, gusting to 16 mph25 km/h
July 27
7am50°F10°C9 mph15 km/h SouthwestRain
8am49°F9°C8 mph13 km/h SouthwestDrizzle
9am48°F9°C8 mph13 km/h SouthwestRain
10am48°F9°C7 mph12 km/h SouthDrizzle
11am47°F8°C9 mph14 km/h SouthRain
12pm46°F8°C8 mph14 km/h SouthwestRain
1pm46°F8°C9 mph14 km/h SouthwestDrizzle
2pm45°F7°C7 mph11 km/h SouthRain
3pm44°F7°C7 mph11 km/h SouthDrizzle
4pm44°F7°C6 mph9 km/h SouthwestDrizzle
5pm44°F7°C5 mph9 km/h SouthwestDrizzle
6pm44°F7°C7 mph11 km/h SouthDrizzle
DateLowHighWindDayNight
July 2643°F6°C56°F13°C11 mph17 km/h from NorthwestRainRain
July 2743°F6°C53°F12°C9 mph15 km/h from SouthDrizzleDrizzle
July 2842°F6°C60°F16°C8 mph13 km/h from SouthMostly ClearMostly Clear
July 2942°F6°C62°F17°C4 mph6 km/h from NortheastMostly ClearMostly Clear
July 3044°F7°C66°F19°C6 mph10 km/h from NorthMostly ClearClear
July 3147°F8°C66°F19°C11 mph18 km/h from NorthClearRain
August 154°F12°C62°F17°C12 mph20 km/h from WestRainRain

Yes

Low of 44°F7°C, High of 53°F12°C
Wind: 9 mph15 km/h
Precipitation: 77% rain

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