Yes

you do need a jacket based on the weather in Campbelltown NSW 2560, Australia 1 second ago

Why? Because it's not very warm out.
51°F11°C & Partly Cloudy

Wind is 2 mph3 km/h from the W, gusting to 4 mph7 km/h
September 21
10am51°F10°C2 mph3 km/h WClear
11am49°F10°C3 mph4 km/h WClear
12pm48°F9°C3 mph4 km/h WMostly Clear
1pm47°F8°C2 mph4 km/h WMostly Clear
2pm46°F8°C2 mph4 km/h WMostly Clear
3pm46°F8°C2 mph3 km/h WMostly Clear
4pm45°F7°C2 mph3 km/h WPartly Cloudy
5pm48°F9°C2 mph3 km/h WPartly Cloudy
6pm55°F13°C3 mph5 km/h NWMostly Cloudy
7pm61°F16°C6 mph9 km/h NWMostly Cloudy
8pm66°F19°C7 mph12 km/h WMostly Cloudy
9pm70°F21°C10 mph16 km/h WMostly Cloudy
DateLowHighWindDayNight
September 2045°F7°C74°F23°C9 mph14 km/h from WClearMostly Clear
September 2145°F7°C76°F24°C8 mph13 km/h from WMostly ClearClear
September 2245°F7°C82°F28°C6 mph10 km/h from WClearMostly Cloudy
September 2349°F10°C80°F26°C5 mph8 km/h from NEMostly CloudyMostly Cloudy
September 2455°F13°C81°F27°C9 mph15 km/h from NWMostly CloudyRain
September 2548°F9°C64°F18°C11 mph17 km/h from SDrizzlePartly Cloudy
September 2645°F7°C67°F19°C7 mph11 km/h from EMostly CloudyMostly Cloudy

Yes

Low of 46°F8°C, High of 76°F25°C
Wind: 8 mph13 km/h
Precipitation: None

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