The first match of the T20I series between India and South Africa had also been rained off, at the same venue.
South Africa beat Australia by six wickets in the third and final one-day international at Senwes Park on Saturday.
Australia defeat South Africa by 5-run (DLS) in semifinal; to face India in final
Janneman Malan maiden ton, Lungi Ngidi six-for clinch South African first series win of Boucher era.
South Africa recall Faf du Plessis and Rassie Van der Dussen for India ODI tour.
South Africa eased into the ICC Women T20 World Cup semi-finals with a 17-run victory over Pakistan in Sydney.