Hundreds more are missing following flooding and landslides in the past week, which killed at least 502 people in Indonesia, 334 in Sri Lanka and 170 in Thailand, authorities said.
Indonesia President Prabowo Subianto pledged to rebuild infrastructure while visiting areas affected by floods and landslides on Sumatra island that left thousands homeless and 508 people missing as of Monday.
Some areas of Indonesia remained unreachable Monday after the disaster damaged roads and downed communications lines, with residents in impacted areas relying on aircraft delivering supplies.
Flooding displaced 290,700 people in North Sumatra, West Sumatra and Aceh provinces, the National Disaster Management Agency said.
Prabowo, who visited North Sumatra on Monday and was expected to West Sumatra and Aceh during the day, said the government's response was reaching those in need.
"We need to confront climate change effectively," Prabowo told reporters after visiting survivors.
"Local governments must take a significant role in safeguarding the environment and preparing for the extreme weather conditions that will arise from future climate change."
Sri Lanka authorities said Monday that rescuers are still searching for 370 missing people.
Nearly 148,000 people are housed in temporary shelters after being battered in the past week downpours that flooded homes, fields and roads and triggered landslides, primarily in the tea-growing central hill country.
In Thailand, Prime Minister Anutin Charnvirakul on Saturday outlined recovery and compensation plans for the southern part of the country.
The Department of Disaster Prevention and Mitigation said severe flooding in 12 southern provinces affected more than 1.4 million households and 3.8 million people.
