Yes

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

Why? Because it's cool. Pleasantly cool, but cool.
55°F13°C & Clear

Wind is 3 mph5 km/h from the S, gusting to 5 mph8 km/h
April 30
11pm56°F13°C3 mph5 km/h SClear
May 1
12am56°F13°C3 mph4 km/h SClear
1am57°F14°C3 mph4 km/h SClear
2am61°F16°C2 mph4 km/h SClear
3am67°F19°C2 mph4 km/h SClear
4am72°F22°C3 mph5 km/h SClear
5am75°F24°C4 mph7 km/h SClear
6am77°F25°C5 mph8 km/h SClear
7am79°F26°C5 mph8 km/h SClear
8am80°F27°C6 mph9 km/h SClear
9am80°F26°C6 mph10 km/h SClear
10am78°F26°C7 mph10 km/h SClear
DateLowHighWindDayNight
April 3055°F13°C80°F27°C4 mph7 km/h from SClearClear
May 158°F15°C81°F27°C5 mph7 km/h from SClearClear
May 257°F14°C79°F26°C5 mph8 km/h from NClearClear
May 356°F13°C79°F26°C4 mph6 km/h from NClearClear
May 457°F14°C80°F26°C4 mph6 km/h from NClearClear
May 557°F14°C80°F27°C3 mph5 km/h from NWClearClear
May 658°F14°C81°F27°C3 mph5 km/h from NClearClear

Yes

Low of 58°F15°C, High of 82°F28°C
Wind: 5 mph7 km/h
Precipitation: None

Support This Page