Yes

you do need a jacket based on the weather in Cape Town, 7700, South Africa 1 second ago

Why? Because it's not very warm out!
54°F12°C & Cloudy

Wind is 6 mph9 km/h from the Northwest, gusting to 11 mph18 km/h
September 14
11pm54°F12°C6 mph9 km/h NorthwestCloudy
September 15
12am55°F13°C7 mph11 km/h NorthCloudy
1am55°F13°C8 mph12 km/h NorthCloudy
2am56°F13°C9 mph15 km/h NorthCloudy
3am57°F14°C11 mph17 km/h NorthwestCloudy
4am59°F15°C13 mph21 km/h NorthwestCloudy
5am61°F16°C15 mph24 km/h NorthwestWindy
6am62°F17°C17 mph27 km/h NorthwestWindy
7am63°F17°C18 mph28 km/h NorthwestWindy
8am63°F17°C18 mph29 km/h NorthwestWindy
9am63°F17°C18 mph30 km/h NorthwestWindy
10am62°F17°C19 mph30 km/h NorthwestWindy
DateLowHighWindDayNight
September 1452°F11°C63°F17°C16 mph25 km/h from NorthwestRainRain
September 1552°F11°C61°F16°C8 mph13 km/h from SouthwestMostly CloudyPartly Cloudy
September 1649°F9°C61°F16°C4 mph7 km/h from SouthwestPartly CloudyMostly Clear
September 1750°F10°C63°F17°C7 mph11 km/h from SouthPartly CloudyMostly Cloudy
September 1850°F10°C71°F22°C3 mph5 km/h from SouthMostly CloudyCloudy
September 1955°F13°C66°F19°C5 mph8 km/h from NorthwestMostly CloudyPartly Cloudy
September 2053°F12°C69°F20°C7 mph11 km/h from SouthPartly CloudyDrizzle

Yes

Low of 52°F11°C, High of 62°F17°C
Wind: 8 mph13 km/h
Precipitation: 25% rain

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