The South African Wind Energy Program (SAWEP)2 which ran between 2015-2019 released the Wind Atlas South Africa (WASA) 3 Interim (Fast Track) in October 2017.
The diagram below indicates the Interim (5 km) High-Resolution Wind Resource Map for South Africa. From this map, the South African mean wind speed [ms−1] @ 100 m a.g.l. (above ground level).
Wind Atlas for South Africa (WASA) SANEDI