Yes

you do need a jacket based on the weather in Essendon VIC 3040, Australia 1 second ago

Why? Because there are strong winds blowing out there!
64°F18°C & Mostly Cloudy

Wind is 10 mph16 km/h from the Northwest, gusting to 26 mph42 km/h
September 26
11pm65°F18°C11 mph17 km/h NorthwestMostly Clear
September 27
12am66°F19°C12 mph19 km/h NorthwestMostly Clear
1am66°F19°C12 mph19 km/h WestMostly Clear
2am65°F18°C11 mph18 km/h WestPartly Cloudy
3am64°F18°C11 mph18 km/h WestPartly Cloudy
4am62°F17°C10 mph16 km/h WestMostly Clear
5am60°F15°C7 mph11 km/h WestPartly Cloudy
6am58°F14°C6 mph9 km/h WestPartly Cloudy
7am56°F13°C6 mph9 km/h WestCloudy
8am54°F12°C6 mph9 km/h WestCloudy
9am54°F12°C5 mph8 km/h WestCloudy
10am53°F12°C5 mph8 km/h WestPartly Cloudy
DateLowHighWindDayNight
September 2649°F9°C66°F19°C10 mph16 km/h from NorthwestMostly ClearPartly Cloudy
September 2747°F8°C62°F17°C5 mph8 km/h from SouthwestMostly CloudyMostly Clear
September 2844°F7°C70°F21°C8 mph13 km/h from NorthPartly CloudyDrizzle
September 2950°F10°C67°F20°C11 mph18 km/h from NorthwestRainMostly Clear
September 3047°F8°C63°F17°C12 mph19 km/h from NorthwestMostly CloudyMostly Cloudy
October 147°F8°C59°F15°C11 mph17 km/h from WestDrizzleDrizzle
October 246°F8°C62°F16°C11 mph17 km/h from SouthwestMostly CloudyMostly Cloudy

Yes

Low of 46°F8°C, High of 62°F17°C
Wind: 5 mph8 km/h
Precipitation: 9% rain

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