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Australia will meet India in the final in Melbourne on Sunday.
Australia skipper Meg Lanning led from the front with an unbeaten 49 off as many balls, taking the team to 134/5 in 20 overs.
Nadine de Klerk was the pick of the South Africa bowlers taking three wickets for 19 runs in three overs.
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Brief scores: Australia 134/5 in 20 overs (Lanning 49 not out; de Klerk 3/19). South Africa 92/5 in 13 overs (Wolvaardt 41 not out; Schutt 2/17).