Thai Prime Minister Anutin Charnvirakul visited an evacuation centre as floods killed more than 100 people in southern Thailand.

The premier, along with senior military commanders and provincial officials, assessed the flooding situation in Songkhla's Hat Yai district on November 26.

Lieutenant General Norathip Poinok, commander of the Fourth Army Area, said soldiers have divided the province into four priority zones, deploying helicopters, boats, jet-skis, and trucks to reach cut-off communities.

The Provincial Electricity Authority (PEA) also provided generators and medical supplies for hospitals and shelters across the province.

Officials said more than 7,100 people were staying at the Prince of Songkla University, including 306 Malaysians set for repatriation.

PM Anutin said: 'This visit was a real opportunity to hear exactly what people on the ground are facing.'

He added that he has assigned the Ministry of Interior and the PEA to expedite the restoration of affected infrastructure.

The death toll is expected to breach 100 as catastrophic floods, described by Prime Minister Anutin Charnvirakul as 'the worst flooding in 15 years', swept through southern Thailand.

Police Lieutenant General Trairong Phiewphan, Deputy Inspector General of the Royal Thai Police, said 104 deceased victims have been sent for identification on Thursday evening.

Soldiers, volunteers, and local government units have also been mobilised to hasten relief efforts, but they were hobbled by limited phone signal in the area.

The Thai military has sent some 200 boats, 20 helicopters and its lone aircraft carrier, the Chakri Naruebet, to deliver essential supplies and carry out rescue efforts.

Songkhla's Hat Yai district was among the worst-hit areas, which saw a record 13 inches (335 mm) of rain in a single day on November 21.

Songkhla Governor Ratthasart Chidchoo on Monday declared all 16 districts disaster zones and ordered the immediate evacuation of children, the elderly and the sick.

On Sunday, high-clearance trucks arrived to evacuate more than 400 tourists from flooded hotels across the city.

The Disaster Prevention and Mitigation Department said that floods hit nine southern provinces, affecting some 1,128,284 households and 3,221,958 people.

The Southern Eastern Meteorological Centre said a strong monsoon trough was causing the heavy rainfall, which was expected to ease this week.

Thailand and neighbouring countries in Southeast Asia are in their annual monsoon rainy season which sees soaring temperatures followed by powerful rain storms in the afternoon leading to widespread flash floods.