More than 100,000 people were evacuated from their homes today in five northern states of Malaysia hit by the country's worst monsoon floods in decades.

Extremely high levels of floodwater and bad weather have made relocating victims and the transport of food supplies by helicopter difficult, Prime Minister Najib Razak said in a statement.

A total of 103,412 people have been displaced in Kelantan, Terengganu, Pahang, Perak and Perlis, state news agency Bernama said.

North-eastern peninsular Malaysia, which is worst affected, is regularly hit by flooding during the annual Northeast Monsoon, but this year's rains have been particularly bad.

On Tuesday, nearly 60 foreign tourists were among almost 100 people rescued by boat and helicopter from a resort in a Malaysian national park lashed by its highest rainfall since 1971.

Thailand's Disaster Prevention and Mitigation department today declared disaster zones in eight of its southern provinces after floods killed at least 13 people.

The zones are in Surat Thani, Nakhon Sri Thammarat, Pattalung, Pattani, Yala, Narathiwat, Songkhla and also Trang, which has been flooded since mid December.

Thirteen people have been killed in southern Thailand and five injured.

More than 184,000 households have been affected by the floods and nearly 8,000 people displaced, according to the Department of Disaster Prevention and Mitigation.