At least eight of the victims were caught in underground areas as the flood waters rose rapidly. Another died of a heart attack.
Mauritius’ meteorologists said 152 mm (6 in) of rain fell in less than an hour, 70 mm less than the March average.
Prime Minister Navin Rangoolam declared April 1 a day of mourning.
Speaking on national radio, Navin Rangoolam said Mauritius was suffering badly from the effects of climate change.
The floods caused chaos in Port Louis, with a huge traffic jam paralyzing its centre, L’Express de Mauritius newspaper reported.
The bodies of six people were recovered from a pedestrian subway and another two from an underground car park.
More rain is expected on Sunday, and people have been advised to stay at home.
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