Yes

you do need a jacket based on the weather in Bonnyrigg Heights NSW 2177, Australia 1 second ago

Why? Because it's not very warm out!
53°F12°C & Partly Cloudy

Wind is 7 mph11 km/h from the Northwest, gusting to 17 mph28 km/h
July 13
7am53°F12°C7 mph12 km/h NorthwestPartly Cloudy
8am51°F11°C7 mph11 km/h NorthMostly Clear
9am50°F10°C7 mph11 km/h NorthMostly Clear
10am50°F10°C6 mph10 km/h NorthClear
11am50°F10°C6 mph10 km/h NorthwestClear
12pm50°F10°C6 mph10 km/h NorthwestClear
1pm49°F10°C5 mph8 km/h NorthClear
2pm48°F9°C4 mph6 km/h NorthClear
3pm46°F8°C1 mph2 km/h SoutheastClear
4pm45°F7°C3 mph5 km/h SoutheastClear
5pm45°F7°C2 mph4 km/h SouthClear
6pm48°F9°C4 mph7 km/h SouthwestClear
DateLowHighWindDayNight
July 1237°F3°C62°F17°C3 mph4 km/h from NorthwestPartly CloudyMostly Clear
July 1343°F6°C62°F17°C3 mph6 km/h from SouthwestClearPartly Cloudy
July 1438°F3°C57°F14°C4 mph7 km/h from WestMostly CloudyMostly Clear
July 1536°F2°C62°F17°C3 mph5 km/h from NorthwestClearMostly Clear
July 1636°F2°C62°F16°C3 mph4 km/h from NorthwestPartly CloudyClear
July 1739°F4°C61°F16°C5 mph8 km/h from SouthDrizzlePartly Cloudy
July 1843°F6°C63°F17°C4 mph6 km/h from SouthMostly ClearMostly Clear

Yes

Low of 44°F7°C, High of 62°F17°C
Wind: 3 mph6 km/h
Precipitation: None

Support This Page