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.

The devastation extends beyond Malaysia, with neighbouring Thailand also grappling with the aftermath of heavy rainfall. Flooding in southern Thailand has claimed 25 lives and affected over 300,000 households, with thousands of people still staying in shelters.

Severe floods triggered by monsoon rains killed many and displaced tens of thousands in Malaysia and southern Thailand as the rain that battered the country's east coast last week was equal to the rainfall over the past six months.

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.