Yes

you do need a jacket based on the weather in Girraween NSW 2145, Australia 1 second ago

Why? Because looks like it's raining and it's cool. Pleasantly cool, but cool and it's fairly windy outside!
51°F11°C & Rain

Wind is 12 mph20 km/h from the Southwest, gusting to 25 mph40 km/h
June 30
6pm51°F11°C12 mph20 km/h SouthwestRain
7pm51°F11°C14 mph22 km/h SouthwestRain
8pm52°F11°C15 mph25 km/h SouthwestRain
9pm52°F11°C17 mph27 km/h SouthwestRain
10pm54°F12°C18 mph30 km/h SouthwestRain
11pm54°F12°C19 mph30 km/h SouthwestRain
July 1
12am55°F13°C19 mph31 km/h SouthwestRain
1am55°F13°C20 mph32 km/h SouthwestRain
2am54°F12°C20 mph33 km/h SouthwestRain
3am54°F12°C20 mph32 km/h SouthwestRain
4am53°F11°C20 mph33 km/h SouthwestRain
5am52°F11°C19 mph31 km/h SouthwestRain
DateLowHighWindDayNight
June 3051°F10°C55°F13°C18 mph28 km/h from SouthwestRainRain
July 152°F11°C61°F16°C15 mph24 km/h from SouthwestRainDrizzle
July 250°F10°C62°F17°C10 mph16 km/h from SouthwestRainMostly Clear
July 346°F8°C63°F17°C3 mph4 km/h from NorthwestClearMostly Clear
July 443°F6°C61°F16°C2 mph3 km/h from NorthMostly CloudyCloudy
July 549°F10°C66°F19°C3 mph4 km/h from WestPartly CloudyThunderstorms
July 645°F7°C62°F17°C5 mph8 km/h from SouthwestMostly ClearMostly Clear

Yes

Low of 52°F11°C, High of 61°F16°C
Wind: 15 mph24 km/h
Precipitation: 84% rain

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