Yes

you do need a jacket based on the weather in Prahran VIC 3181, Australia 1 second ago

Why? Because it's quite chilly!
44°F7°C & Clear

Wind is 4 mph7 km/h from the Northeast, gusting to 9 mph15 km/h
September 17
2pm44°F6°C5 mph8 km/h NortheastClear
3pm44°F7°C6 mph9 km/h NortheastClear
4pm44°F7°C6 mph10 km/h NorthClear
5pm45°F7°C7 mph11 km/h NorthClear
6pm49°F10°C9 mph14 km/h NorthClear
7pm54°F12°C11 mph17 km/h NorthClear
8pm58°F15°C13 mph21 km/h NorthClear
9pm62°F16°C13 mph21 km/h NorthClear
10pm65°F18°C13 mph21 km/h NorthMostly Clear
11pm67°F19°C13 mph22 km/h NorthwestMostly Clear
September 18
12am68°F20°C14 mph23 km/h NorthwestPartly Cloudy
1am68°F20°C14 mph23 km/h NorthwestMostly Cloudy
DateLowHighWindDayNight
September 1744°F6°C68°F20°C12 mph20 km/h from NorthMostly ClearPartly Cloudy
September 1852°F11°C70°F21°C16 mph26 km/h from NorthwestWindyRain
September 1945°F7°C57°F14°C13 mph20 km/h from WestMostly CloudyMostly Cloudy
September 2049°F10°C63°F17°C12 mph20 km/h from NorthwestDrizzleDrizzle
September 2146°F8°C56°F14°C13 mph21 km/h from SouthwestDrizzleMostly Cloudy
September 2245°F7°C61°F16°C9 mph15 km/h from SouthwestMostly CloudyMostly Cloudy
September 2351°F10°C64°F18°C10 mph16 km/h from SouthwestMostly CloudyMostly Cloudy

Yes

Low of 52°F11°C, High of 71°F22°C
Wind: 16 mph26 km/h
Precipitation: 15% rain

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