Yes

you do need a jacket based on the weather in Doveton VIC 3177, Australia 1 second ago

Why? Because it's not very warm out!
54°F12°C & Mostly Cloudy

Wind is 1 mph2 km/h from the Southeast, gusting to 4 mph6 km/h
April 3
5pm54°F12°C3 mph4 km/h SouthMostly Cloudy
6pm55°F13°C1 mph2 km/h SoutheastMostly Cloudy
7pm57°F14°C1 mph2 km/h WestPartly Cloudy
8pm59°F15°C3 mph4 km/h WestMostly Cloudy
9pm60°F15°C3 mph6 km/h SouthwestMostly Cloudy
10pm61°F16°C4 mph6 km/h SouthwestMostly Cloudy
11pm62°F17°C7 mph12 km/h SouthwestMostly Cloudy
April 4
12am63°F17°C9 mph14 km/h SouthwestMostly Cloudy
1am63°F17°C8 mph14 km/h SouthwestPartly Cloudy
2am62°F17°C7 mph12 km/h SouthwestMostly Cloudy
3am62°F16°C5 mph8 km/h SouthwestMostly Cloudy
4am61°F16°C4 mph6 km/h WestMostly Cloudy
DateLowHighWindDayNight
April 354°F12°C63°F17°C5 mph7 km/h from SouthwestMostly CloudyRain
April 452°F11°C61°F16°C7 mph11 km/h from SouthwestPartly CloudyClear
April 549°F10°C69°F20°C11 mph18 km/h from NorthwestPartly CloudyMostly Cloudy
April 654°F12°C63°F17°C7 mph11 km/h from WestMostly CloudyMostly Cloudy
April 752°F11°C64°F18°C4 mph7 km/h from SouthwestPartly CloudyMostly Clear
April 848°F9°C68°F20°C3 mph5 km/h from SouthwestMostly CloudyMostly Clear
April 952°F11°C78°F26°C8 mph13 km/h from NorthMostly ClearMostly Clear

Yes

Low of 52°F11°C, High of 62°F17°C
Wind: 7 mph11 km/h
Precipitation: None

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