The government has instructed 70 provinces and Bangkok to monitor flash floods, forest runoff, mudslides, and waterlogging, ordering operational teams and heavy machinery to be ready for emergency response and victim assistance from 23 to 27 September 2026.
23 September 2026 GMT+7 Ms. Ploytale Laksameesangchan, Deputy Spokesperson for the Prime Minister's Office, announced that from 23 to 27 September 2026, Thailand will experience heavy rain in many areas, with very heavy rain in some places. The initial impact will be in the lower Northeast and Eastern regions, with other areas affected later.
The government is concerned for the public’s safety and urges people to monitor weather conditions, warnings, water levels, and official information continuously. People are reminded to beware of waterlogging, flash floods, riverbank overflows, forest runoff, mudslides, and recurrent urban flooding caused by inadequate drainage.
. The areas under watch for flash floods, forest runoff, mudslides, and waterlogging include all provinces in the North, Northeast, and Central regions, plus seven southern provinces: Chumphon, Surat Thani, Songkhla, Ranong, Phang Nga, Phuket, and Narathiwat.
. Areas under observation for sudden water level rises, riverbank overflows, and flooding in low-lying zones along main rivers and tributaries include the Moei, Yuam, and Mae Sariang rivers in Mae Hong Son; the Wang Thong River in Phitsanulok; the Phachi River in Ratchaburi; the Nakhon Nayok River in Nakhon Nayok; the Prachinburi River in Prachinburi; the Phra Sateung and Phra Prong canals in Sa Kaeo; the Chanthaburi River in Chanthaburi; the Kaper Canal in Ranong; and the Sai Buri and Kolok rivers in Narathiwat.
Additionally, attention is requested for flood-prone areas downstream of the Chao Phraya Dam. It is forecasted that floodwaters from the upper watershed will pass through the dam at about 1,500 cubic meters per second, causing water levels to rise approximately 0.75 to 1.25 meters from current levels. This will affect vulnerable low-lying zones outside flood barriers in Chai Nat Province (Sanphaya District), Sing Buri Province (In Buri District), Ang Thong Province (Mueang Ang Thong and Wiset Chai Chan districts), Phra Nakhon Si Ayutthaya Province (Sena, Phak Hai, Bang Ban, Phra Nakhon Si Ayutthaya, Bang Pa-in, and Bang Sai districts), and Pathum Thani Province (Mueang Pathum Thani and Sam Khok districts).
Ms. Ploytale concluded by stating that the government, through the Department of Disaster Prevention and Mitigation (DDPM), has coordinated with 70 provinces across the North, Northeast, Central, South regions, and Bangkok to monitor flash floods, forest runoff, mudslides, and waterlogging. The DDPM has ordered the deployment of operational teams and disaster response machinery to high-risk areas to respond immediately and assist victims, especially in frequently flooded spots and areas currently experiencing flooding, to expedite drainage and minimize flood impact as much as possible.