Yes

you do need a jacket based on the weather in Adelaide SA, Australia 7 minutes ago

Why? Because there are strong winds blowing out there!
75°F24°C & Clear

Wind is 11 mph17 km/h from the Northwest, gusting to 27 mph44 km/h
September 18
2am75°F24°C10 mph15 km/h NorthwestMostly Clear
3am73°F23°C8 mph13 km/h NorthwestMostly Clear
4am71°F22°C7 mph11 km/h NorthPartly Cloudy
5am69°F20°C7 mph11 km/h NorthMostly Cloudy
6am67°F19°C6 mph10 km/h NortheastMostly Cloudy
7am65°F18°C7 mph10 km/h WestMostly Clear
8am62°F17°C4 mph6 km/h SouthwestPartly Cloudy
9am59°F15°C2 mph3 km/h SoutheastMostly Clear
10am58°F15°C2 mph4 km/h EastClear
11am57°F14°C2 mph4 km/h WestClear
12pm55°F13°C3 mph5 km/h NorthwestClear
1pm53°F12°C3 mph5 km/h NorthClear
DateLowHighWindDayNight
September 1749°F10°C75°F24°C9 mph14 km/h from NorthMostly ClearMostly Clear
September 1850°F10°C63°F17°C14 mph22 km/h from WestDrizzleDrizzle
September 1948°F9°C57°F14°C10 mph17 km/h from WestMostly CloudyMostly Cloudy
September 2051°F11°C60°F15°C11 mph18 km/h from WestDrizzleMostly Cloudy
September 2145°F7°C60°F16°C9 mph15 km/h from SouthPartly CloudyMostly Clear
September 2243°F6°C61°F16°C6 mph9 km/h from SouthwestPartly CloudyPartly Cloudy
September 2344°F7°C62°F17°C6 mph10 km/h from WestPartly CloudyMostly Cloudy

Yes

Low of 50°F10°C, High of 64°F18°C
Wind: 14 mph22 km/h
Precipitation: 33% rain

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