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.

In South Thailand, over 600,000 households have been affected by the relentless downpours and flash floods. The lives of 12 people have tragically been lost, and thousands of residents have been forced to evacuate their homes and seek refuge in temporary shelters.

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.

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 floods also submerged large tracts of rice fields, causing millions of dollars in losses to farmers, officials said. The heavy downpour also damaged roads, houses and public facilities in Kelantan and other parts of Malaysia.