Yes

you do need a jacket based on the weather in Brisbane QLD, Australia 1 second ago

Why? Because just cool enough for a jacket, but not warm enough to ditch it and it's fairly windy outside!
57°F14°C & Clear

Wind is 10 mph16 km/h from the West, gusting to 25 mph40 km/h
July 1
6am57°F14°C10 mph16 km/h WestClear
7am56°F13°C10 mph15 km/h WestClear
8am54°F12°C9 mph15 km/h WestClear
9am53°F12°C9 mph15 km/h WestClear
10am53°F11°C9 mph15 km/h WestClear
11am52°F11°C9 mph15 km/h WestClear
12pm51°F11°C10 mph17 km/h WestClear
1pm51°F11°C11 mph18 km/h WestClear
2pm51°F11°C11 mph18 km/h WestClear
3pm50°F10°C12 mph19 km/h WestClear
4pm50°F10°C12 mph20 km/h WestClear
5pm49°F10°C13 mph21 km/h WestClear
DateLowHighWindDayNight
June 3053°F11°C67°F19°C9 mph15 km/h from WestClearClear
July 149°F10°C64°F18°C16 mph26 km/h from WestWindyClear
July 250°F10°C65°F18°C12 mph20 km/h from WestClearClear
July 348°F9°C67°F19°C5 mph8 km/h from SouthwestClearMostly Clear
July 448°F9°C71°F22°C4 mph7 km/h from EastMostly ClearMostly Cloudy
July 558°F14°C73°F23°C3 mph6 km/h from NorthwestDrizzleMostly Clear
July 653°F12°C69°F21°C6 mph10 km/h from WestClearClear

Yes

Low of 49°F10°C, High of 64°F18°C
Wind: 16 mph26 km/h
Precipitation: None

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