Yes

you do need a jacket based on the weather in Kellyville NSW 2155, Australia 1 second ago

Why? Because it's cool. Pleasantly cool, but cool!
53°F12°C & Mostly Clear

Wind is 9 mph14 km/h from the Northwest, gusting to 19 mph30 km/h
July 27
7am53°F12°C8 mph13 km/h NorthwestMostly Clear
8am52°F11°C9 mph14 km/h NorthwestMostly Clear
9am51°F11°C8 mph13 km/h NorthwestMostly Clear
10am51°F11°C8 mph13 km/h NorthwestClear
11am51°F10°C9 mph14 km/h NorthwestMostly Clear
12pm50°F10°C8 mph13 km/h NorthwestMostly Clear
1pm50°F10°C8 mph14 km/h NorthwestMostly Clear
2pm49°F10°C8 mph13 km/h NorthwestClear
3pm49°F10°C8 mph13 km/h NorthwestMostly Clear
4pm49°F9°C8 mph13 km/h NorthwestMostly Clear
5pm49°F10°C8 mph13 km/h NorthwestMostly Clear
6pm51°F11°C9 mph14 km/h NorthwestMostly Clear
DateLowHighWindDayNight
July 2651°F11°C62°F17°C6 mph10 km/h from NorthwestPartly CloudyMostly Clear
July 2749°F9°C61°F16°C11 mph18 km/h from WestMostly ClearClear
July 2845°F7°C61°F16°C5 mph8 km/h from WestMostly CloudyDrizzle
July 2947°F8°C54°F12°C5 mph8 km/h from SouthwestRainRain
July 3044°F7°C58°F14°C8 mph13 km/h from SouthDrizzleRain
July 3147°F9°C56°F14°C8 mph13 km/h from SouthRainRain
August 147°F8°C55°F13°C12 mph20 km/h from SouthRainRain

Yes

Low of 49°F10°C, High of 62°F17°C
Wind: 11 mph18 km/h
Precipitation: None

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