Worst-hit was Knysna, a town of 77,000 people 500 kilometres (310 miles) east of Cape Town on South Africa's famed Garden Route, as firefighters battled to quell 26 fires along the tourist trail.
The intense storm has claimed nine lives, including a three-year-old, as it battered the Western Cape region and caused the blaze to spread rapidly, according to provincial government minister Anton Bredell.
The storm, which struck on Tuesday, has damaged buildings, felled trees, left 46,000 homes without electricity and caused travel chaos as flights and rail services were hit by gale-force winds and flooding.
Military helicopters are on standby to help extinguish the blazes as soon as conditions permit, local media reported.
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Western Cape premier Helen Zille told Kaya FM: "What we need is air power - water-bombing, and helicopters to see which areas are affected and who needs to be evacuated."
Zille has been suspended from her party - the main opposition Democratic Alliance - over tweets apparently endorsing colonialism, but remains head of the regional government. She spent the night in Knysna to coordinate the response of emergency services to the crisis.
"To date between 8,000 and 10,000 Knysna inhabitants have been safely evacuated.