The southern state of Kerala — a popular tourist haven known for its pristine beaches, hill resorts and backwaters — is among the worst hit, with the toll jumping to at least 67 deaths.
“At least 165,000 people have been moved to over 1,318 relief camps spread across 14 districts in the state,” a senior Kerala police officer told AFP.
Bad weather and damaged infrastructure were affecting rescue and relief work, he added.
Local emergency personnel and troops from the army, navy and air force have been roped in for ongoing search, rescue and relief operations across the affected regions.
The flood toll also increased in adjoining Karnataka state, where at least 34 people are now confirmed dead.
“At least 14 others are still missing. We have rescued around 480,000 people, over 50,000 animals and set up around 1,100 relief camps which have over 300,000 people,” a Karnataka government official told AFP.
He said at least 136 roads and highways across the state had either been damaged or remain cut off because of floodwaters.
“The rains have eased in the upstream Maharashtra state but some reservoirs in the region have received record inflows and will have to be opened,” he added.
“It is an unprecedented situation. We expect the flows to reduce in the next four-five days if there aren’t any more rains.”
At least 27 people have also lost their lives in Maharashtra, where several key towns have been underwater over the last few days, media reports said.
Meanwhile accidents caused by heavy rains in Gujarat, the home state of India’s Prime Minister Narendra Modi, have taken the lives of at least 16 people.
While the monsoon rains are crucial to replenishing water supplies, they kill hundreds of people every year.