OVERVIEW: Continuous heavy to very heavy rainfall over Thailand, driven by a monsoon trough over the Central region combined with a strong Southwest Monsoon prevailing over the Andaman Sea and the Gulf of Thailand, has caused widespread flooding in recent days as water flowing down from the North merged with existing water volumes in the Central region. As of 26 September 2026 at 0600 HRS UTC+7, flooding has been reported across 22 provinces, including Bangkok, according to the Department of Disaster Prevention and Mitigation (DDPM) and the Thai Meteorological Department (TMD).
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IMPACTS: The following impacts have been reported by DDPM as of 26 September 2026 at 0600 HRS UTC+7:
- 22 provinces affected: Chiang Mai, Phetchabun, Nakhon Sawan, Phitsanulok, Uthai Thani, Lop Buri, Sing Buri, Suphan Buri, Saraburi, Pathum Thani, Nakhon Pathom, Phra Nakhon Si Ayutthaya, Samut Prakan, Prachin Buri, Chachoengsao, Sa Kaeo, Chon Buri, Rayong, Chanthaburi, Trat, Nakhon Ratchasima, and Bangkok
- 93 districts, 350 sub-districts, and 1,425 villages affected, with 27,109 households (84,605 people) affected
- 1 fatality reported (Saraburi Province)
- 15 districts and 44 locations in Bangkok also affected, with flooded roads and communities reported in some areas
- Water levels rising in Suphan Buri, Chachoengsao, and Sa Kaeo provinces.
HAZARDS AND ANTICIPATED RISKS:
- Heavy Rain Warning: TMD forecasts heavy to very heavy rain to continue over the Central region (including Bangkok and vicinity) and the Eastern region through 27 September, easing from 28 September though heavy rain may persist in the western North and Central regions, raising continued risk of cumulative and flash flooding, particularly in foothill and low-lying areas.
- Authorities warned that 26–27 September will bring continued risks of heavy to very heavy rainfall in many areas due to a strong low-pressure system and monsoon trough. Vigilance is advised for flash floods, landslides, mudslides, and river overflows, particularly in hillside, low-lying, and flood-prone areas (DDPM).
PREPAREDNESS AND RESPONSE:
- The Prime Minister has directed the Deputy Prime Minister, the Deputy Permanent Secretary of the Interior, and the DDPM Director-General to coordinate with governors of at-risk provinces on early warning, evacuation, and pre-positioning of resources under a 24-hour watch.
- DDPM has mobilised personnel and machinery including pump-equipped trucks, flood relief vehicles, mobile pumping units, and flat-bottom boats to affected provinces, coordinating with provincial and regional offices, local authorities, police, military, and volunteer networks to support drainage, evacuation, and relief efforts.
- DDPM issued a Cell Broadcast warning for Bo Rai and Khao Saming districts amid rising canal levels from continuous rain and dam discharge, and has pre-positioned boats, water pumps, and shelters.
- TMD continues to monitor weather conditions and issue advisories and warnings as the situation develops.
The AHA Centre is closely monitoring the developments of the widespread flooding in Thailand, in close coordination with DDPM, and stands ready to support the Government of Thailand should the need arise.
DATA SOURCES
ASEAN Disaster Monitoring & Response System (DMRS), ASEAN Disaster Information Network (ADINet); ASEAN Specialised Meteorological Centre (ASMC);
Thailand: DDPM, TMD;
Verified news media agencies
