More than 300,000 people have been displaced since August 8 when the Kerala rains began and a record amount of rain fell in the southern Indian state.
Pinarayi Vijayan, Kerala’s chief minister tweeted on Friday that 314,391 people were staying in relief camps across the state.
They are taking shelter in more than 2,000 relief camps.
Prime Minister Narendra Modi wrote on Twitter: “In Kerala I took stock of the situation arising in the wake of the devastating floods across the state.
“Joined a review meeting and understood an aerial survey to assess the damage caused by flooding.
“The nation stands firmly with Kerala in this hour.”
At least 324 people have been killed in the state’s worst flooding in nearly a century, which has destroyed thousands of homes and roads.
There are fears even more people could die as countless people are still marooned and desperate for food and drinking water.
Modi surveyed the flooding damage and images showed the prime minister at a meeting with local officials and flying over the flooded areas.
Chief Minister of Kerala Pinarayi Vijayan said the floods had caused an estimated $2.7 billion in damages.
He tweeted that Kerala is facing the worst flood in 100 years.
Kerala State Disaster Management Authority (KSDMA) officials said on Friday evening that 2,600 villages have been flooded.
In a statement, Modi promised $71.6 million in assistance along with other relief such as food and medicines.
He has promised more helicopters, boats and other equipment needed to expand the rescue operation in the unfolding emergency.
The international airport, Kochi Airport, remains closed until August 26, officials said in a statement.
More heavy rains are expected in isolated areas on Saturday, the Indian Meteorological Department (IMD) said.
Over 30 military helicopters and 320 boats are attempting rescue across Kerala as some areas have been engulfed by overflowing rivers.
Helicopters have been dropping emergency food and water supplies, while special trains carrying drinking water have been sent to Kerala.
PH Kurian State Relief Commissioner and Convenor of KSDMA told Al Jazeera: “We are deploying more boats, helicopters and the army to speed up rescue operations.”