Sydney:Meg Lanning-led Australia defeated South Africa by five runs via DLS method in Sydney to set up final vs India on Sunday.
Australia will play against India in the summit clash of the tournament at Melbourne Cricket Ground (MCG) on March 8.
Proteas had to chase the revised score of 98 in 13 overs after the rain interrupted the play in innings break.
Chasing 98, Lizelle Lee and skipper Dane van Niekerk built an opening stand of 20-run. The former was picked by Sophie Molineux in the third over. Lee scored 10 runs.
The side then lost two quick wickets as van Niekerk (12) and Mignon du Preez (0) were bagged by Megan Schutt and Delissa Kimmince respectively.
Sune Luus and Laura Wolvaardt built a partnership of 47-run for the fourth wicket. Schutt scalped Luus (21) in the 12th over.
Proteas were required the 19 runs off the last over. The team manages to score only 13 runs and reach 92/5 in 13 overs. Wolvaardt remained unbeaten on 41 runs while Nadine de Klerk scored six not out.