Yes

you do need a jacket based on the weather in Mordialloc VIC 3195, Australia 1 second ago

Why? Because just cool enough for a jacket, but not warm enough to ditch it and it's really really huffing out there!
54°F12°C & Windy

Wind is 16 mph25 km/h from the West, gusting to 32 mph52 km/h
July 27
10pm54°F12°C15 mph23 km/h WestMostly Cloudy
11pm55°F13°C13 mph21 km/h WestDrizzle
July 28
12am55°F13°C14 mph22 km/h WestDrizzle
1am54°F12°C11 mph18 km/h SouthwestDrizzle
2am54°F12°C9 mph14 km/h WestDrizzle
3am53°F12°C8 mph13 km/h WestDrizzle
4am53°F12°C13 mph21 km/h WestPartly Cloudy
5am51°F11°C9 mph14 km/h WestMostly Cloudy
6am51°F11°C9 mph14 km/h WestMostly Cloudy
7am51°F10°C10 mph17 km/h WestPartly Cloudy
8am50°F10°C10 mph16 km/h WestPartly Cloudy
9am50°F10°C10 mph15 km/h WestPartly Cloudy
DateLowHighWindDayNight
July 2750°F10°C55°F13°C12 mph19 km/h from WestRainRain
July 2847°F8°C53°F12°C4 mph7 km/h from WestDrizzleMostly Cloudy
July 2944°F7°C53°F12°C5 mph8 km/h from SouthDrizzleMostly Clear
July 3042°F5°C56°F13°C7 mph12 km/h from SoutheastMostly ClearPartly Cloudy
July 3144°F7°C55°F13°C4 mph7 km/h from SouthMostly CloudyPartly Cloudy
August 141°F5°C55°F13°C3 mph6 km/h from WestMostly ClearPartly Cloudy
August 242°F6°C59°F15°C8 mph13 km/h from NorthMostly ClearMostly Cloudy

Yes

Low of 46°F8°C, High of 54°F12°C
Wind: 4 mph7 km/h
Precipitation: 71% rain

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