Severe floods caused by monsoon rains killed more than 30 people and displaced tens of thousands in Malaysia and southern Thailand, officials said Tuesday, with both countries preparing shelters and evacuation plans in anticipation of more heavy rain.

The death toll from severe flooding in Thailand has risen to 25, with six provinces remaining inundated as water levels gradually receded, the Department of Disaster Prevention and Mitigation

With tens of thousands already displaced, both countries set up shelters in anticipation of further downpours.

At least 13 people died and tens of thousands evacuated in one of the worst floods in decades to batter southern Thailand and northern Malaysia.

Severe floods triggered by monsoon rains killed more than 30 people and displaced tens of thousands in Malaysia and southern Thailand, officials said on Tuesday, with both countries preparing shelters and evacuation plans in anticipation of more rains.

At least 12 people have died and more than 600,000 households have been affected by the worst flooding in southern Thailand in decades, according to a government agency.

The death toll from the worst floods in decades in southern Thailand and northern Malaysia climbed to at least 12 on Saturday, authorities said, as tens of thousands of people were evacuated due to rising water levels in the past three days.

There are worries in Malaysia and neighbouring Thailand that disastrous flooding could get worse as more rain comes.

Floods in northern Malaysia and southern Thailand have claimed the lives of at least 12 people, and 135,000 individuals have been forced to leave their homes. Authorities warn that the number of casualties may increase.

Malaysia and Thailand are facing a second wave of heavy rain and potential flooding this week, authorities said on Monday, even as some displaced residents were able to return home and the worst floods in decades began receding in some areas.