Yes

you do need a jacket based on the weather in St Kilda VIC 3182, 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!
57°F14°C & Windy

Wind is 20 mph32 km/h from the North, gusting to 42 mph67 km/h
July 12
11pm58°F14°C20 mph32 km/h NorthWindy
July 13
12am59°F15°C19 mph31 km/h NorthWindy
1am59°F15°C17 mph28 km/h NorthWindy
2am59°F15°C16 mph26 km/h NorthWindy
3am58°F14°C16 mph25 km/h NorthwestWindy
4am55°F13°C15 mph24 km/h NorthwestDrizzle
5am54°F12°C15 mph24 km/h WestWindy
6am52°F11°C13 mph21 km/h WestPartly Cloudy
7am51°F11°C12 mph20 km/h WestMostly Clear
8am50°F10°C13 mph21 km/h WestMostly Clear
9am49°F9°C12 mph19 km/h WestMostly Clear
10am48°F9°C11 mph18 km/h WestPartly Cloudy
DateLowHighWindDayNight
July 1248°F9°C59°F15°C16 mph26 km/h from NorthDrizzleDrizzle
July 1345°F7°C56°F13°C7 mph12 km/h from NorthwestPartly CloudyRain
July 1446°F8°C57°F14°C7 mph11 km/h from NorthwestPartly CloudyPartly Cloudy
July 1547°F8°C58°F15°C8 mph12 km/h from NorthwestDrizzleDrizzle
July 1647°F8°C59°F15°C9 mph15 km/h from NorthwestDrizzleMostly Clear
July 1743°F6°C59°F15°C4 mph7 km/h from NorthMostly ClearMostly Clear
July 1844°F7°C58°F14°C12 mph19 km/h from NorthPartly CloudyMostly Cloudy

Yes

Low of 46°F8°C, High of 56°F14°C
Wind: 7 mph12 km/h
Precipitation: None

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