According to the Press Trust of India news agency, officials said that rescuers had recovered the bodies from two of the most severely affected districts, Kottayam (Idukki), where heavy downpours caused massive landslides.
As many people are still missing, the Indian Army and the National Disaster Response Force deployed teams to assist with rescue efforts.
Television reports showed people wading through deep water to rescue passengers trapped in a bus nearly submerged by torrential rains on Saturday.
Prime Minister Narendra Modi stated that he had spoken to the chief minister, and that authorities were working hard to rescue the victims. In a tweet, he stated that he prayed for the safety and well-being of all.
2018 saw devastating floods in Kerala, where heavy downpours during the monsoon season caused 223 deaths and drove hundreds of thousands away from their homes.