Five others are believed to have died as they sought to park their cars under shelter, according to local authorities, while emergency responders said three others drowned in their car when it became stuck inside a tunnel.
Heavy flooding along the Cote d'Azur, in France's southeast, saw the River Brague burst its banks close to the city of Antibes and sent deadly waves crashing into the nearby home for the elderly.
Another victim was found dead at an Antibes campsite, according to local officials.
"Some cars were carried off into the sea," said Cannes Mayor Davis Lisnard, describing water levels reaching halfway up car doors and trees left uprooted on the city's main drag.
"We have rescued a lot of people, and we must now be vigilant against looting," he added, announcing that an emergency plan was now in effect to mobilise police, emergency responders and municipal services.
French President Francois Hollande thanked rescuers and politicians for their work so far, expressing the "solidarity of the nation" and offering condolences to the families affected, while Prime Minister Manuel Valls spoke of his "deep emotion" upon hearing of the deaths.
The areas worst-hit by flooding were also the hardest to access, officials said, raising fears the death toll could rise again, while 35,000 homes were confirmed to be without power.
French rail company SNCF said around a dozen trains had to be halted with hundreds on board for the safety of passengers, while roads around Antibes were also flooded, according to French emergency services.
Up to 500 tourists, including several British and Danish nationals, sought shelter overnight at Nice airport, while a Nice-Nantes football match was also interrupted by the downpours.
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