South Africa's economic growth is due to grow by 0.8% in 2020, largely flat from 2019, said the International Monetary Fund said on Thursday.

The weak performance of state firms and subsequent government bailouts have contributed to a growing deficit.

"Weaknesses in public enterprises are resulting in poor service delivery and weighing on the fiscus through bailouts or administrative interventions," said the IMF in a statement.

Heavy rains battered parts of the country last month, submerging whole neighbourhoods and flooding coal mines and power stations in a nation already hit by electricity blackouts.