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.

The Malaysian Department of Social Welfare reported late Monday that over 95,000 people across eight states were forced to evacuate to over 400 temporary relief centers. Kelantan continued to record the highest number of evacuees at 58,146, followed by Terengganu, 27,544, Kedah, 7,426, and Pahang, 1,847.

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

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.

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.

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 floods have impacted nearly 534,000 households in Thailand,

More than 122,000 people have been forced out of their homes as massive floods caused by relentless rains swept through Malaysia's northern states, disaster management officials said Saturday.

Intense rain and flooding have killed several people and displaced over 100,000 across regions of northern Malaysia and southern Thailand. Officials warn this year could bring the worst flooding in a decade to the region.