Yes

you do need a jacket based on the weather in Brisbane QLD, Australia 11 minutes ago

Why? Because just cool enough for a jacket, but not warm enough to ditch it!
54°F12°C & Clear

Wind is 5 mph8 km/h from the Southwest, gusting to 11 mph18 km/h
September 11
2pm53°F12°C4 mph7 km/h SouthwestClear
3pm53°F12°C4 mph6 km/h SouthwestClear
4pm52°F11°C4 mph7 km/h SouthwestClear
5pm54°F12°C5 mph8 km/h SouthwestClear
6pm59°F15°C6 mph9 km/h SouthwestClear
7pm63°F17°C6 mph10 km/h SouthwestClear
8pm66°F19°C6 mph10 km/h SouthClear
9pm69°F21°C6 mph10 km/h SouthClear
10pm72°F22°C6 mph10 km/h SoutheastMostly Clear
11pm73°F23°C8 mph14 km/h SoutheastPartly Cloudy
September 12
12am73°F23°C9 mph14 km/h SoutheastMostly Cloudy
1am73°F23°C8 mph13 km/h EastPartly Cloudy
DateLowHighWindDayNight
September 1152°F11°C73°F23°C7 mph12 km/h from SoutheastMostly ClearDrizzle
September 1254°F12°C71°F22°C6 mph10 km/h from EastPartly CloudyPartly Cloudy
September 1354°F12°C74°F23°C6 mph9 km/h from EastMostly ClearClear
September 1453°F12°C75°F24°C6 mph9 km/h from NortheastClearMostly Clear
September 1556°F13°C76°F25°C7 mph12 km/h from NortheastMostly ClearClear
September 1658°F15°C81°F27°C5 mph9 km/h from NortheastClearMostly Clear
September 1761°F16°C77°F25°C7 mph11 km/h from EastMostly ClearMostly Clear

Yes

Low of 55°F13°C, High of 71°F22°C
Wind: 6 mph10 km/h
Precipitation: 21% rain

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