Yes

you do need a jacket based on the weather in Mona Vale NSW 2103, Australia 1 second ago

Why? Because the air feels like the cozy middle ground between summer and winter!
51°F11°C & Mostly Cloudy

Wind is 6 mph9 km/h from the West, gusting to 14 mph22 km/h
August 4
1pm51°F11°C6 mph10 km/h WestPartly Cloudy
2pm51°F10°C6 mph9 km/h WestPartly Cloudy
3pm50°F10°C6 mph10 km/h WestPartly Cloudy
4pm50°F10°C6 mph10 km/h WestMostly Clear
5pm50°F10°C6 mph10 km/h WestMostly Clear
6pm52°F11°C6 mph10 km/h NorthwestMostly Clear
7pm56°F13°C6 mph10 km/h NorthwestMostly Clear
8pm60°F16°C6 mph10 km/h NorthwestClear
9pm64°F18°C6 mph9 km/h NorthwestClear
10pm67°F19°C5 mph7 km/h NorthwestClear
11pm69°F20°C4 mph7 km/h NorthwestClear
August 5
12am70°F21°C5 mph7 km/h NorthwestClear
DateLowHighWindDayNight
August 449°F10°C70°F21°C5 mph9 km/h from NorthwestMostly ClearClear
August 549°F10°C64°F18°C8 mph13 km/h from SouthwestMostly ClearDrizzle
August 650°F10°C61°F16°C11 mph18 km/h from SouthDrizzleMostly Cloudy
August 748°F9°C60°F16°C8 mph12 km/h from SouthDrizzleRain
August 851°F11°C61°F16°C9 mph15 km/h from SouthDrizzleDrizzle
August 951°F11°C60°F16°C7 mph12 km/h from SouthDrizzleDrizzle
August 1050°F10°C62°F17°C5 mph9 km/h from SoutheastMostly ClearPartly Cloudy

Yes

Low of 49°F10°C, High of 64°F18°C
Wind: 8 mph13 km/h
Precipitation: None

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