Yes

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

Why? Because it's pretty chilly!
55°F13°C & Clear

Wind is 2 mph3 km/h from the Northwest, gusting to 8 mph13 km/h
July 5
7am57°F14°C3 mph5 km/h NorthwestClear
8am59°F15°C4 mph6 km/h NorthwestClear
9am59°F15°C5 mph8 km/h NorthwestClear
10am58°F15°C5 mph8 km/h NorthwestClear
11am56°F13°C5 mph7 km/h NorthwestClear
12pm53°F12°C5 mph7 km/h NorthwestClear
1pm49°F10°C4 mph7 km/h NorthwestClear
2pm46°F8°C4 mph6 km/h NorthwestClear
3pm43°F6°C3 mph6 km/h NorthwestClear
4pm42°F6°C3 mph6 km/h NorthwestClear
5pm41°F5°C4 mph6 km/h NorthwestClear
6pm40°F5°C4 mph6 km/h NorthwestClear
DateLowHighWindDayNight
July 434°F1°C59°F15°C3 mph5 km/h from NorthwestClearClear
July 538°F3°C63°F17°C7 mph12 km/h from WestClearClear
July 633°F0°C56°F13°C5 mph8 km/h from SouthClearClear
July 732°F0°C57°F14°C5 mph7 km/h from NorthClearClear
July 836°F2°C60°F15°C3 mph5 km/h from NorthwestClearClear
July 937°F3°C63°F17°C3 mph5 km/h from SouthwestClearClear
July 1038°F4°C64°F18°C4 mph6 km/h from WestClearClear

Yes

Low of 37°F3°C, High of 64°F18°C
Wind: 7 mph12 km/h
Precipitation: None

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