Yes

you do need a jacket based on the weather in Johannesburg, South Africa 1 second ago

Why? Because a jacket will keep you cozy, but you won't break a seat!
55°F13°C & Partly Cloudy

Wind is 6 mph10 km/h from the North, gusting to 17 mph28 km/h
August 26
11pm55°F13°C6 mph10 km/h NorthPartly Cloudy
August 27
12am54°F12°C6 mph10 km/h NorthPartly Cloudy
1am54°F12°C7 mph11 km/h NorthPartly Cloudy
2am57°F14°C7 mph11 km/h NorthPartly Cloudy
3am60°F15°C8 mph13 km/h NorthMostly Cloudy
4am64°F18°C9 mph14 km/h NorthMostly Cloudy
5am67°F20°C9 mph15 km/h NorthMostly Cloudy
6am70°F21°C9 mph14 km/h NorthMostly Cloudy
7am73°F23°C8 mph14 km/h NorthPartly Cloudy
8am75°F24°C8 mph13 km/h NorthPartly Cloudy
9am75°F24°C7 mph11 km/h NorthwestPartly Cloudy
10am74°F24°C5 mph9 km/h NorthwestPartly Cloudy
DateLowHighWindDayNight
August 2654°F12°C75°F24°C7 mph11 km/h from NorthPartly CloudyMostly Cloudy
August 2757°F14°C78°F26°C6 mph10 km/h from NorthMostly ClearClear
August 2855°F13°C76°F25°C9 mph14 km/h from NorthClearClear
August 2957°F14°C78°F26°C7 mph11 km/h from NorthwestClearClear
August 3058°F15°C79°F26°C5 mph9 km/h from NorthwestClearClear
August 3158°F14°C79°F26°C5 mph8 km/h from NorthwestClearClear
September 155°F13°C78°F26°C7 mph11 km/h from NorthwestMostly ClearMostly Clear

Yes

Low of 56°F14°C, High of 79°F26°C
Wind: 6 mph10 km/h
Precipitation: None

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