Yes

you do need a jacket based on the weather in Castle Hill NSW 2154, Australia 1 second ago

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

Wind is 4 mph7 km/h from the North, gusting to 11 mph18 km/h
June 6
7am52°F11°C5 mph8 km/h NorthMostly Cloudy
8am51°F11°C5 mph8 km/h NorthwestPartly Cloudy
9am50°F10°C4 mph7 km/h NorthPartly Cloudy
10am49°F10°C5 mph7 km/h NorthwestPartly Cloudy
11am48°F9°C4 mph7 km/h NorthwestPartly Cloudy
12pm47°F9°C5 mph7 km/h NorthwestMostly Clear
1pm46°F8°C4 mph7 km/h NorthwestMostly Clear
2pm46°F8°C5 mph8 km/h NorthMostly Clear
3pm47°F9°C7 mph11 km/h NorthClear
4pm48°F9°C7 mph11 km/h NorthClear
5pm48°F9°C7 mph12 km/h NorthClear
6pm50°F10°C7 mph12 km/h NorthClear
DateLowHighWindDayNight
June 539°F4°C61°F16°C2 mph3 km/h from NorthMostly CloudyMostly Clear
June 646°F8°C64°F18°C9 mph15 km/h from NorthwestClearMostly Clear
June 745°F7°C58°F14°C11 mph18 km/h from NorthwestMostly ClearMostly Clear
June 844°F7°C56°F13°C12 mph19 km/h from WestPartly CloudyMostly Clear
June 947°F9°C60°F16°C9 mph14 km/h from WestMostly ClearClear
June 1043°F6°C60°F16°C7 mph11 km/h from WestMostly ClearDrizzle
June 1142°F5°C60°F15°C6 mph9 km/h from SouthwestPartly CloudyDrizzle

Yes

Low of 46°F8°C, High of 64°F18°C
Wind: 9 mph15 km/h
Precipitation: None

Support This Page