The department said 51,543 families in 1,028 villages in 49 districts of Surat Thani, Nakhon Si Thammarat, Trang, Phatthalung, Satun, Songkhla, Pattani, Yala and Narathiwat are under water.
The strong monsoon over the Gulf of Thailand in the South has pounded the region with heavy rain since Saturday, the department said. The rains are expected to continue until Tuesday.
So far, the following districts in nine provinces are struggling with heavy flooding:
• Surat Thani: Phunphin, Tha Chang
• Nakhon Si Thammarat: Pak Phanang, Muang, Sichon, Chalerm Phrakiat, Chian Yai, Chulabhorn
• Trang: Na Yong, Yan Ta Khao, Palian
• Phatthalung: Tamot, Srinakharin, Kong Ra, Khao Chaison, Pak Phayun, Pa Bon, Bang Kaew
• Satun: Langu
• Songkhla: Muang, Rattaphum, Khuan Niang, Hat Yai, Na Mom, Chana, Bang Klam, Ranot
• Pattani: Muang, Kapho, Yaring
• Yala: Bannang Sata, Than To, Raman, Yaha, Muang, Krong Pinang
• Narathiwat: Sukhirin, Si Sakhon, Rusoh, Rangae, Chanae, Muang, Joh I Rong, Sungai Padi, Bacho, Waeng, Sungai Kolok, Tak Bai, Yi-ngor