Yes

you do need a jacket based on the weather in Hornsby NSW 2077, Australia 1 second ago

Why? Because sorry, it's too cool for just a hoodie and it's so windy, you’re practically horizontal just trying to walk!
56°F13°C & Cloudy

Wind is 14 mph23 km/h from the Southeast, gusting to 30 mph48 km/h
August 2
4am56°F13°C12 mph20 km/h SoutheastRain
5am56°F13°C14 mph22 km/h SoutheastThunderstorms
6am56°F13°C14 mph22 km/h SoutheastRain
7am56°F13°C15 mph24 km/h SoutheastRain
8am57°F14°C16 mph26 km/h SoutheastDrizzle
9am57°F14°C17 mph27 km/h SoutheastRain
10am57°F14°C16 mph26 km/h SoutheastRain
11am56°F13°C13 mph21 km/h SoutheastThunderstorms
12pm56°F13°C14 mph22 km/h SoutheastRain
1pm56°F13°C12 mph20 km/h SoutheastRain
2pm55°F13°C13 mph21 km/h SoutheastDrizzle
3pm56°F13°C14 mph22 km/h SoutheastRain
DateLowHighWindDayNight
August 150°F10°C57°F14°C7 mph11 km/h from SoutheastHeavy RainThunderstorms
August 254°F12°C60°F15°C11 mph17 km/h from SouthRainDrizzle
August 351°F11°C64°F18°C4 mph7 km/h from SouthDrizzleMostly Cloudy
August 449°F9°C68°F20°C4 mph6 km/h from NorthwestMostly ClearClear
August 547°F8°C63°F17°C5 mph8 km/h from SouthwestClearMostly Clear
August 646°F8°C59°F15°C7 mph11 km/h from SouthDrizzleDrizzle
August 746°F8°C59°F15°C6 mph10 km/h from SouthDrizzleDrizzle

Yes

Low of 55°F13°C, High of 60°F16°C
Wind: 11 mph17 km/h
Precipitation: 100% rain

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