Yes

you do need a jacket based on the weather in 52 Ida St, Hornsby NSW 2077, Australia 1 second ago

Why? Because it's pretty chilly!
52°F11°C & Clear

Wind is 3 mph5 km/h from the Southwest, gusting to 11 mph17 km/h
July 13
7pm53°F12°C5 mph7 km/h SouthwestClear
8pm56°F14°C7 mph11 km/h SouthwestClear
9pm58°F15°C6 mph10 km/h SouthwestClear
10pm60°F15°C6 mph10 km/h SouthwestClear
11pm61°F16°C6 mph9 km/h SouthwestClear
July 14
12am61°F16°C4 mph7 km/h SouthwestClear
1am61°F16°C3 mph5 km/h SouthwestClear
2am60°F16°C3 mph5 km/h SouthwestClear
3am57°F14°C4 mph7 km/h NortheastClear
4am54°F12°C4 mph7 km/h EastClear
5am53°F11°C3 mph5 km/h NortheastClear
6am51°F10°C3 mph5 km/h NortheastClear
DateLowHighWindDayNight
July 1345°F7°C61°F16°C4 mph7 km/h from SouthwestClearPartly Cloudy
July 1441°F5°C55°F13°C6 mph10 km/h from WestCloudyMostly Clear
July 1539°F4°C61°F16°C4 mph6 km/h from NorthwestClearMostly Clear
July 1638°F3°C61°F16°C3 mph4 km/h from WestPartly CloudyClear
July 1742°F6°C57°F14°C6 mph9 km/h from SouthDrizzleMostly Clear
July 1841°F5°C63°F17°C4 mph6 km/h from NorthMostly ClearClear
July 1942°F5°C62°F17°C3 mph5 km/h from NorthMostly ClearPartly Cloudy

Yes

Low of 41°F5°C, High of 55°F13°C
Wind: 6 mph10 km/h
Precipitation: None

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