Yes

you do need a jacket based on the weather in Smeaton Grange NSW 2567, Australia 1 second ago

Why? Because a jacket will keep you cozy, but you won't break a seat!
51°F11°C & Clear

Wind is 3 mph5 km/h from the Southeast, gusting to 5 mph8 km/h
June 5
5am51°F10°C4 mph6 km/h SoutheastClear
6am49°F9°C4 mph6 km/h SouthClear
7am47°F8°C4 mph7 km/h SouthwestMostly Clear
8am45°F7°C4 mph7 km/h SouthwestPartly Cloudy
9am44°F7°C4 mph7 km/h SouthwestPartly Cloudy
10am43°F6°C4 mph7 km/h SouthwestPartly Cloudy
11am42°F6°C4 mph7 km/h SouthwestPartly Cloudy
12pm42°F6°C4 mph6 km/h SouthwestMostly Cloudy
1pm42°F5°C4 mph7 km/h SouthwestMostly Cloudy
2pm42°F6°C4 mph6 km/h SouthwestMostly Cloudy
3pm42°F5°C4 mph6 km/h SouthwestPartly Cloudy
4pm41°F5°C4 mph6 km/h SouthwestPartly Cloudy
DateLowHighWindDayNight
June 443°F6°C63°F17°C6 mph10 km/h from SouthwestClearPartly Cloudy
June 541°F5°C62°F17°C2 mph4 km/h from WestMostly CloudyPartly Cloudy
June 643°F6°C64°F18°C8 mph13 km/h from WestMostly ClearMostly Clear
June 741°F5°C58°F15°C7 mph12 km/h from NorthwestMostly ClearMostly Clear
June 838°F3°C55°F13°C9 mph14 km/h from NorthwestPartly CloudyPartly Cloudy
June 943°F6°C60°F16°C11 mph18 km/h from WestMostly ClearMostly Clear
June 1046°F8°C61°F16°C10 mph16 km/h from SouthwestClearMostly Clear

Yes

Low of 41°F5°C, High of 63°F17°C
Wind: 2 mph4 km/h
Precipitation: None

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