The death toll from deadly flash floods that swept two Indonesian islands, including tourist hotspot Bali, rose to 19 on Thursday, officials said, with five others missing.

Torrential rain since late Tuesday triggered floods and landslides in seven districts across Bali, National Disaster Mitigation Agency spokesman Abdul Muhari said in a statement.

The death toll in Bali had risen to 14, Abdul said, up from nine late on Wednesday, with two people missing.

More than 500 people were evacuated, with public facilities including schools, village halls and mosques converted into makeshift shelters.

"Officers are still carrying out emergency response efforts such as searching for victims and managing floods and landslides that have impacted the public," Abdul said.

The toll from a flash flood that hit the Nagekeo district of Flores island also rose to five after a young child was found dead on Thursday, local search and rescue agency head Fathur Rahman said.

Rescuers were using excavators and a thermal drone as they searched for three people still missing in Nagekeo, Fathur said.

The weather had cleared in Bali's provincial capital Denpasar, AFP journalists said on Thursday.

However, Indonesia's Meteorology, Climatology and Geophysics Agency said in a statement this week that moderate rain could return in provinces including Bali between Friday and Monday.

The annual monsoon season in Indonesia, typically between November and April, often brings landslides, flash floods and water-borne diseases.

Climate change has affected storm patterns, including the length and severity of the season, leading to heavier rain, flash flooding and stronger wind gusts.

Activist group 350.org said the latest disaster served as a reminder that climate crisis is an "urgent threat" that demands action from world leaders, including Indonesian President Prabowo Subianto.

Indonesia is set to submit its emission reduction plan to the UN Framework Convention on Climate Change later this year.

"We urge President Prabowo to ensure that Indonesia has an ambitious emissions reduction goal and a concrete plan to transition to 100 percent renewable energy," 350.org field organizer Suriadi Darmoko said in a statement. 

Floods and landslides on Java island in March killed three people and left five others missing after heavy rain inundated two dozen towns.

In January, at least 25 people were killed when floods and landslides hit a town in Central Java.