No

you don't need a jacket based on the weather in Cape Town, South Africa 1 second ago

62°F17°C & Partly Cloudy

Wind is 6 mph9 km/h from the West, gusting to 12 mph19 km/h
September 2
12pm62°F16°C6 mph10 km/h WestPartly Cloudy
1pm60°F15°C4 mph6 km/h WestMostly Clear
2pm58°F15°C4 mph6 km/h WestMostly Clear
3pm57°F14°C3 mph5 km/h WestPartly Cloudy
4pm56°F13°C3 mph5 km/h WestPartly Cloudy
5pm55°F13°C2 mph4 km/h SouthwestPartly Cloudy
6pm55°F13°C2 mph3 km/h SouthwestPartly Cloudy
7pm55°F13°C1 mph2 km/h SouthwestPartly Cloudy
8pm53°F12°C2 mph2 km/h NortheastPartly Cloudy
9pm53°F11°C2 mph3 km/h NortheastPartly Cloudy
10pm52°F11°C2 mph3 km/h NortheastMostly Clear
11pm51°F11°C2 mph4 km/h NortheastPartly Cloudy
DateLowHighWindDayNight
September 152°F11°C66°F19°C5 mph9 km/h from NorthwestPartly CloudyPartly Cloudy
September 251°F10°C66°F19°C4 mph7 km/h from SouthwestMostly ClearPartly Cloudy
September 354°F12°C70°F21°C5 mph8 km/h from SouthMostly CloudyPartly Cloudy
September 456°F13°C68°F20°C9 mph14 km/h from SouthPartly CloudyPartly Cloudy
September 554°F12°C67°F20°C9 mph15 km/h from SouthPartly CloudyPartly Cloudy
September 656°F13°C69°F20°C11 mph17 km/h from SoutheastPartly CloudyClear
September 756°F13°C72°F22°C7 mph11 km/h from SouthClearPartly Cloudy

Yes

Low of 51°F11°C, High of 66°F19°C
Wind: 4 mph7 km/h
Precipitation: None

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