Yes

you do need a jacket based on the weather in Sunbury VIC 3429, Australia 1 second ago

Why? Because there's a refreshing nip in the air!
43°F6°C & Mostly Clear

Wind is 7 mph11 km/h from the West, gusting to 12 mph19 km/h
August 12
4pm43°F6°C7 mph11 km/h WestMostly Clear
5pm43°F6°C7 mph11 km/h WestMostly Clear
6pm45°F7°C7 mph11 km/h WestPartly Cloudy
7pm48°F9°C7 mph12 km/h WestPartly Cloudy
8pm50°F10°C9 mph14 km/h SouthwestPartly Cloudy
9pm51°F11°C9 mph14 km/h SouthwestPartly Cloudy
10pm53°F12°C9 mph15 km/h SouthMostly Clear
11pm54°F12°C10 mph16 km/h SouthMostly Clear
August 13
12am54°F12°C10 mph16 km/h SouthMostly Clear
1am55°F13°C9 mph15 km/h SouthMostly Clear
2am54°F12°C9 mph15 km/h SouthMostly Clear
3am52°F11°C9 mph15 km/h SouthMostly Clear
DateLowHighWindDayNight
August 1242°F6°C55°F13°C8 mph14 km/h from SouthwestMostly ClearMostly Clear
August 1342°F5°C63°F17°C6 mph9 km/h from NorthMostly ClearMostly Cloudy
August 1444°F6°C57°F14°C16 mph26 km/h from NorthDrizzleDrizzle
August 1540°F5°C51°F10°C11 mph18 km/h from SouthwestPartly CloudyPartly Cloudy
August 1641°F5°C53°F12°C11 mph17 km/h from WestRainDrizzle
August 1740°F5°C54°F12°C8 mph13 km/h from SouthDrizzlePartly Cloudy
August 1837°F3°C57°F14°C4 mph7 km/h from NortheastPartly CloudyMostly Clear

Yes

Low of 42°F6°C, High of 64°F18°C
Wind: 6 mph9 km/h
Precipitation: None

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