Yes

you do need a jacket based on the weather in Parramatta NSW 2150, Australia 7 minutes ago

Why? Because it's not very warm out!
58°F15°C & Clear

Wind is 4 mph6 km/h from the West, gusting to 11 mph17 km/h
September 17
8pm62°F16°C3 mph5 km/h WestMostly Clear
9pm64°F18°C2 mph3 km/h NorthwestClear
10pm68°F20°C3 mph5 km/h NorthClear
11pm70°F21°C4 mph7 km/h NorthClear
September 18
12am72°F22°C5 mph8 km/h NorthClear
1am72°F22°C6 mph9 km/h NorthClear
2am72°F22°C7 mph11 km/h NorthClear
3am70°F21°C8 mph13 km/h NortheastClear
4am66°F19°C8 mph13 km/h NortheastClear
5am64°F18°C8 mph12 km/h NortheastClear
6am62°F16°C7 mph12 km/h NortheastClear
7am60°F16°C6 mph10 km/h NorthClear
DateLowHighWindDayNight
September 1747°F9°C72°F22°C5 mph7 km/h from NorthClearClear
September 1849°F9°C79°F26°C6 mph9 km/h from NorthwestMostly ClearMostly Cloudy
September 1951°F10°C70°F21°C10 mph17 km/h from WestClearClear
September 2045°F7°C72°F22°C6 mph9 km/h from WestMostly ClearClear
September 2149°F10°C70°F21°C8 mph13 km/h from SouthwestPartly CloudyDrizzle
September 2245°F7°C63°F17°C9 mph14 km/h from SouthDrizzleClear
September 2342°F6°C70°F21°C6 mph10 km/h from SouthwestMostly ClearPartly Cloudy

Yes

Low of 49°F10°C, High of 79°F26°C
Wind: 6 mph9 km/h
Precipitation: 7% rain

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