Yes

you do need a jacket based on the weather in Nowra NSW 2541, Australia 1 second ago

Why? Because it's cool. Pleasantly cool, but cool.
59°F15°C & Mostly Cloudy

Wind is 2 mph3 km/h from the W, gusting to 4 mph7 km/h
April 16
7am58°F15°C2 mph3 km/h WMostly Cloudy
8am57°F14°C2 mph4 km/h WMostly Cloudy
9am56°F14°C2 mph4 km/h WMostly Cloudy
10am56°F13°C2 mph4 km/h WPartly Cloudy
11am55°F13°C2 mph4 km/h WMostly Cloudy
12pm54°F12°C2 mph4 km/h WPartly Cloudy
1pm54°F12°C2 mph3 km/h WMostly Cloudy
2pm54°F12°C2 mph3 km/h WMostly Cloudy
3pm54°F12°C2 mph3 km/h WMostly Cloudy
4pm54°F12°C2 mph3 km/h WMostly Cloudy
5pm55°F13°C2 mph3 km/h WCloudy
6pm59°F15°C1 mph2 km/h SWMostly Cloudy
DateLowHighWindDayNight
April 1553°F12°C73°F23°C4 mph6 km/h from EMostly ClearMostly Cloudy
April 1654°F12°C69°F20°C3 mph5 km/h from SEMostly CloudyMostly Cloudy
April 1751°F10°C70°F21°C4 mph6 km/h from SPartly CloudyMostly Cloudy
April 1849°F9°C66°F19°C6 mph10 km/h from SDrizzleDrizzle
April 1953°F12°C65°F18°C8 mph13 km/h from SMostly CloudyMostly Cloudy
April 2051°F11°C71°F22°C4 mph6 km/h from SMostly ClearMostly Clear
April 2149°F10°C71°F22°C4 mph7 km/h from SEMostly ClearPartly Cloudy

Yes

Low of 54°F12°C, High of 69°F21°C
Wind: 3 mph5 km/h
Precipitation: 26% rain

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