With thousands trapped, power and communication lines down, authorities warned of more trouble ahead. "We pray that our brothers and sisters of Kerala resume normal life soon", Banerjee added.
Survivors at evacuation centres have described spending days without food or water.
But some people in the relief camps were finding it hard to access food and water.
"They didn't think that it would rise this high - 10 to 15 feet at some places - when the initial warnings were issued", said Ashraf Ali K.M, who is leading the search in the small town of Mala in Thrissur. More than 100 dead and 200,000 left homeless. bad!
Vijayan paid special tributes to Kerala's famed fishermen who played a key role in rescuing hundreds and navigating through unsafe waters.
The southern state is facing its worst flood in 100 years with 80 dams opened and all rivers in spate.
More than 300,000 people have taken shelter in over 1,500 state-run relief camps, officials said.
"We are deploying more boats and the army to ramp up rescue operations", state government official PH Kurian told AFP news agency.
In Delhi, senior Bharatiya Janata Party (BJP) leader P. Muralidhar Rao told media persons that the party workers from different parts of the country were in the process of collecting food and medicines for the flood-affected people in Kerala, and these would dispatched to the state soon.
Officials estimate that more than 10,000 kilometers (6,200 miles) of roads have been damaged.
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The death toll in Kerala state rose above 400 on Monday.
"Our solidarity and the concrete support of the worldwide community should not lack for our brothers", said Pope Francis.
Thousands of stranded people were waiting for rescue Saturday and officials pleaded for more help as relentless monsoon floods battered the south Indian state of Kerala, where more than 190 have died in a little over a week and much of the state is partially submerged.
Desperate villagers had to improvise as the floodwaters rose, using large kitchen pots as rafts to reach their stricken neighbours.
There have been moments of cheer amid the tragedy.
The monsoon rains are forecast to ease from Sunday but the flood waters are expected to remain for some time to come.
The prime minister also directed the National Highways Authority of India to fix national highways damaged due to the floods on a priority basis.
A man rescues a drowning man as monsoon rains cause flash floods and landslides in the southern Indian state of Kerala.
Prime Minister Narendra Modi, who was taken by helicopter over inundated farmland and villages, promised more helicopters, boats and other equipment needed to expand the rescue operation in the still unfolding emergency.