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

PM says six months of rain fell in five days as floods wreak havoc in Malaysia - Heavy monsoon rain has displaced over 150,000 in Malaysia and killed dozens across Southeast Asia

Torrential rains have caused widespread devastation, and forecasters predict more downpours starting on Tuesday.

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.

Malaysia prepared for its worst floods in a decade after heavier-than-expected monsoon rains caused severe flooding that killed three people and displaced more than 80,000

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.

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.

Preparations are underway after heavier-than-expected monsoon rains caused severe flooding that killed at least three people and displaced more than 80,000.

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.