Yes

you do need a jacket based on the weather in Parramatta NSW 2150, Australia 1 second ago

Why? Because it's pretty chilly!
53°F12°C & Cloudy

Wind is 3 mph5 km/h from the Southwest, gusting to 8 mph13 km/h
June 12
6am53°F12°C3 mph5 km/h SouthwestCloudy
7am52°F11°C3 mph6 km/h SouthwestCloudy
8am51°F10°C4 mph6 km/h WestMostly Cloudy
9am50°F10°C4 mph6 km/h WestMostly Cloudy
10am48°F9°C4 mph6 km/h WestMostly Cloudy
11am48°F9°C4 mph6 km/h WestMostly Cloudy
12pm48°F9°C4 mph7 km/h SouthwestMostly Cloudy
1pm47°F9°C4 mph7 km/h SouthwestCloudy
2pm47°F8°C4 mph7 km/h SouthwestMostly Cloudy
3pm47°F8°C5 mph7 km/h SouthwestMostly Cloudy
4pm47°F8°C5 mph8 km/h SouthwestMostly Cloudy
5pm47°F8°C5 mph8 km/h SouthwestMostly Cloudy
DateLowHighWindDayNight
June 1139°F4°C62°F17°C2 mph4 km/h from SouthwestMostly CloudyMostly Cloudy
June 1247°F8°C60°F16°C7 mph12 km/h from SouthwestDrizzleDrizzle
June 1346°F8°C62°F17°C3 mph5 km/h from SouthwestDrizzleMostly Cloudy
June 1445°F7°C64°F18°C4 mph7 km/h from WestMostly ClearClear
June 1540°F4°C63°F17°C3 mph5 km/h from NorthClearMostly Clear
June 1641°F5°C65°F19°C4 mph7 km/h from NorthwestMostly ClearClear
June 1741°F5°C64°F18°C3 mph4 km/h from NorthwestMostly ClearMostly Cloudy

Yes

Low of 46°F8°C, High of 60°F16°C
Wind: 7 mph12 km/h
Precipitation: 50% rain

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