Yes

you do need a jacket based on the weather in Mornington VIC 3931, Australia 1 second ago

Why? Because sorry, it's too cool for just a hoodie!
54°F12°C & Cloudy

Wind is 9 mph14 km/h from the Northwest, gusting to 16 mph25 km/h
July 27
12am54°F12°C9 mph14 km/h NorthwestMostly Cloudy
1am54°F12°C9 mph14 km/h NorthMostly Cloudy
2am53°F12°C8 mph14 km/h NorthwestMostly Cloudy
3am52°F11°C8 mph12 km/h NorthwestDrizzle
4am51°F11°C7 mph12 km/h NorthRain
5am51°F10°C9 mph15 km/h NorthwestDrizzle
6am51°F10°C10 mph15 km/h NorthwestDrizzle
7am51°F10°C11 mph18 km/h NorthwestDrizzle
8am50°F10°C12 mph19 km/h WestMostly Cloudy
9am50°F10°C13 mph20 km/h WestMostly Cloudy
10am50°F10°C13 mph21 km/h WestMostly Cloudy
11am50°F10°C13 mph22 km/h WestDrizzle
DateLowHighWindDayNight
July 2647°F8°C54°F12°C8 mph13 km/h from NorthwestRainDrizzle
July 2748°F9°C55°F13°C13 mph22 km/h from WestRainDrizzle
July 2845°F7°C53°F11°C5 mph9 km/h from WestDrizzleDrizzle
July 2943°F6°C54°F12°C4 mph7 km/h from SouthDrizzleMostly Clear
July 3040°F4°C55°F13°C7 mph11 km/h from SoutheastMostly ClearMostly Clear
July 3142°F5°C54°F12°C5 mph8 km/h from SouthDrizzleDrizzle
August 143°F6°C55°F13°C5 mph7 km/h from SouthDrizzlePartly Cloudy

Yes

Low of 48°F9°C, High of 55°F13°C
Wind: 13 mph22 km/h
Precipitation: 84% rain

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