Yes

you do need a jacket based on the weather in Auckland Park, Johannesburg, 2092, South Africa 1 second ago

Why? Because it's not very warm out!
55°F13°C & Clear

Wind is 6 mph10 km/h from the Northwest, gusting to 15 mph24 km/h
June 28
8am56°F13°C7 mph11 km/h NorthwestClear
9am56°F14°C6 mph10 km/h NorthwestClear
10am56°F13°C6 mph9 km/h NorthwestClear
11am54°F12°C4 mph7 km/h NorthwestClear
12pm51°F11°C3 mph5 km/h NorthwestClear
1pm49°F9°C3 mph5 km/h NorthwestClear
2pm46°F8°C3 mph4 km/h NorthwestClear
3pm44°F7°C2 mph3 km/h NorthwestClear
4pm43°F6°C1 mph2 km/h WestClear
5pm42°F6°C2 mph3 km/h SouthwestClear
6pm41°F5°C2 mph3 km/h SouthwestClear
7pm40°F5°C2 mph3 km/h SouthwestClear
DateLowHighWindDayNight
June 2733°F0°C56°F14°C4 mph6 km/h from NorthwestClearClear
June 2835°F2°C62°F17°C4 mph6 km/h from SouthClearClear
June 2939°F4°C61°F16°C5 mph9 km/h from NorthClearClear
June 3038°F4°C61°F16°C4 mph7 km/h from NorthClearClear
July 142°F6°C62°F16°C5 mph8 km/h from NorthwestMostly ClearClear
July 245°F7°C63°F17°C5 mph8 km/h from NorthwestMostly ClearPartly Cloudy
July 345°F7°C61°F16°C9 mph14 km/h from NorthwestMostly ClearMostly Clear

Yes

Low of 36°F2°C, High of 62°F17°C
Wind: 4 mph6 km/h
Precipitation: None

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