The Department of Disaster Prevention and Mitigation (DDPM) has coordinated with 35 provinces in the Northeast, Central, and Southern regions, as well as Bangkok, to prepare for heavy to very heavy rainfall between 18 and 25 October 2026. There is a risk of flash floods, mountain stream floods, landslides, waterlogging, and strong gusty winds.
On 17 October 2026, Mr. Nirat Pongsitthaworn, Director-General of DDPM, stated that the Department, under the Central Disaster Prevention and Mitigation Operations Center (CDPMOC), has been monitoring weather conditions and risk factors. The Meteorological Department issued Announcement No. 1 (260/2569) on 17 October 2026 at 05:00, warning of heavy to very heavy rainfall in Thailand from 18 to 25 October 2026. From 18 to 20 October, continuous heavy rain is expected in the South and East, with some areas experiencing very heavy rain. From 21 to 25 October, increased rainfall with heavy to very heavy rain and strong gusty winds is expected in the lower Northeast, Central region, Bangkok metropolitan area, East, and upper South.
Initially, the monsoon trough will pass through the lower South, accompanied by the southwest monsoon covering the lower Andaman Sea. Then, the trough will move northward over the upper South, upper Gulf of Thailand, and East. Meanwhile, high-pressure or cold air masses from the People's Republic of China will cover the upper North, upper Northeast, and South China Sea. Waves in the Andaman Sea and Gulf of Thailand in stormy areas are expected to exceed 3 meters in height.
Areas expected to experience heavy rain with risks of flash floods, mountain stream floods, landslides, waterlogging, and strong gusty winds between 18 and 25 October 2026 are as follows:
Nakhon Ratchasima, Buriram, and Ubon Ratchathani provinces
Kanchanaburi, Ratchaburi, Suphanburi, Nakhon Nayok, Prachinburi, Chachoengsao, Chonburi, Rayong, Chanthaburi, Trat, Phetchaburi, Prachuap Khiri Khan, Pathum Thani, Nonthaburi, Nakhon Pathom, Samut Sakhon, Samut Songkhram, and Samut Prakan provinces
Chumphon, Surat Thani, Nakhon Si Thammarat, Phatthalung, Songkhla, Pattani, Yala, Narathiwat, Ranong, Phang Nga, Phuket, Krabi, Trang, and Satun provinces
The Central Disaster Prevention and Mitigation Operations Center (CDPMOC) of DDPM has therefore notified the 35 provinces and Bangkok, as well as district disaster prevention and mitigation centers in at-risk areas, to prepare for heavy to very heavy rainfall that could cause flooding. They are to closely monitor weather, rainfall, and water situations. If conditions worsen or spread, operational teams with disaster relief machinery and vehicles must be ready to assist the public immediately, 24 hours a day, especially in flood-prone areas and those currently experiencing flooding. Water drainage should be accelerated to minimize flood impact as much as possible.
For natural tourist sites, especially caves and waterfalls, if there is a risk of disaster, warnings and area closures should be announced to prevent entry. Related agencies should prepare temporary shelters, food, drinking water, and necessities to accommodate evacuees during floods.
The public is urged to closely follow weather forecasts and official information, especially those in risk areas, and strictly comply with warnings. Check that houses and buildings are structurally sound. Avoid open spaces, large trees, billboards, or unstable structures to prevent injury from collapse. Also, beware of lightning strikes. Farmers should support trees or set up shelters to protect crops from damage.
If affected or in danger, people can report incidents and request help via the Line "DDPM Incident Reporting 1784" Line ID @1784DDPM and the emergency hotline 1784, available 24 hours.
