Yes

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

Why? Because it's cold enough that makes you wish you had a hat, but you're still too proud to admit it!
47°F8°C & Mostly Cloudy

Wind is 3 mph5 km/h from the Northeast, gusting to 6 mph10 km/h
July 5
1pm47°F8°C3 mph5 km/h NortheastMostly Cloudy
2pm48°F9°C3 mph5 km/h NortheastCloudy
3pm48°F9°C3 mph4 km/h EastCloudy
4pm48°F9°C3 mph5 km/h EastMostly Cloudy
5pm48°F9°C2 mph4 km/h NortheastMostly Cloudy
6pm48°F9°C2 mph4 km/h NorthMostly Cloudy
7pm49°F10°C2 mph3 km/h NortheastMostly Cloudy
8pm52°F11°C2 mph3 km/h EastPartly Cloudy
9pm56°F13°C3 mph5 km/h EastPartly Cloudy
10pm59°F15°C2 mph4 km/h SoutheastMostly Cloudy
11pm61°F16°C3 mph4 km/h SouthMostly Cloudy
July 6
12am61°F16°C4 mph6 km/h SouthMostly Cloudy
DateLowHighWindDayNight
July 547°F8°C61°F16°C3 mph5 km/h from SouthMostly CloudyMostly Clear
July 644°F7°C63°F17°C3 mph6 km/h from NorthMostly ClearPartly Cloudy
July 747°F9°C56°F13°C18 mph29 km/h from NorthRainRain
July 844°F7°C54°F12°C13 mph21 km/h from NorthPartly CloudyDrizzle
July 944°F7°C51°F11°C9 mph15 km/h from WestDrizzleDrizzle
July 1043°F6°C58°F15°C6 mph10 km/h from WestMostly CloudyPartly Cloudy
July 1144°F7°C60°F15°C6 mph9 km/h from NorthMostly CloudyMostly Cloudy

Yes

Low of 45°F7°C, High of 63°F17°C
Wind: 3 mph6 km/h
Precipitation: None

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