Heavy monsoon rain and a tropical depression triggered severe flooding across Thailand from late September 2026, submerging parts of Bangkok and dozens of provinces. Government officials reported at least 40 deaths nationwide and millions of people affected, with Samut Prakan, Sa Kaeo and Bangkok among the hardest-hit areas. Authorities declared a state of emergency, opened hundreds of shelters, and said full drainage in the capital could take up to a week.
Severe flooding hit Thailand from late September 2026 after a tropical depression that formed over Cambodia on September 24 combined with an already active seasonal monsoon, according to Wikipedia's account of the event. The resulting downpours — in places over 300 millimetres of rain fell in a single stretch — submerged streets across all 50 districts of Bangkok and spread into dozens of surrounding provinces.
What is known so far
Thai authorities declared a state of emergency on September 26 at 10:16 a.m. local time, according to Wikipedia. By September 29, the Thai health ministry had recorded 23 deaths nationwide, the Malaysian outlet The Star reported, citing the ministry; flooding had been ongoing since around September 16, according to Nation Thailand. That toll rose further as flooding persisted; Wikipedia's tally, reflecting later government figures, put nationwide deaths at 40.
The Star's September 29 report broke down the then-current toll of 23 by location: four deaths in Bangkok, eight in Samut Prakan province south of the capital, six in Sa Kaeo, and the remainder in Chanthaburi, Ayutthaya and Saraburi provinces. Flooding had by then reached 29 of Thailand's 77 provinces plus Bangkok, the Thailand-based news outlet Nation Thailand reported, citing Department of Disaster Prevention and Mitigation (DDPM) situation reports.
Scale of the disaster
Nation Thailand, drawing on DDPM data from September 29, reported that more than 2.6 million people across 940,300 households had been affected nationwide. The Star separately reported that roughly 700,000 people were affected in Bangkok alone, with nearly 7,000 people sheltering in more than 230 temporary facilities in the capital as of that date.
Flood impact by area, as reported September 29, 2026
Area
Deaths reported
People affected
Bangkok (citywide)
4
~700,000
Samut Prakan
8
818,862
Sa Kaeo
6
33,171
Pathum Thani
1
355,834
Chonburi
not reported
372,790
Nationwide total
23 (rising to 40 by later counts)
2.6 million+
Property losses were estimated at more than 11 billion baht, or roughly $327 million, according to Wikipedia. The disruption extended to transport and industry: Suvarnabhumi Airport reported about 5,600 stranded baggage items and numerous flight cancellations, and carmaker Toyota halted four manufacturing plants, Wikipedia reported.
Government and emergency response
Bangkok and adjacent provinces were given September 28 and 29 as special holidays, and more than 400 municipal schools were closed, according to Wikipedia. Nation Thailand reported that the Central Disaster Prevention and Mitigation Command issued a fifth warning concerning the Chao Phraya river basin and that the Chao Phraya Dam was expected to release between 1,500 and 2,000 cubic metres of water per second in the following days as part of flood management.
It could take up to a week for floodwater to fully drain from the city.
— Chadchart Sittipunt, Governor of Bangkok, quoted by The Star
The Thai government also approved 4 billion baht in flood relief funding, according to the Chiang Rai Times, which also reported at least 8 additional deaths from flooding in neighboring Myanmar around the same period.
What remains unknown
As of the most recent figures reviewed, it was not clear whether the death toll had been finalized, since counts rose from 23 on September 29 to 40 in subsequent government updates referenced by Wikipedia. Full damage assessments, including agricultural losses and the final number of displaced households, had not been completed in the sources reviewed.
Questions
How many people died in the 2026 Thailand floods?
Thai authorities reported 23 deaths nationwide as of September 29, 2026, a figure that later rose to 40, according to government updates cited by Wikipedia.
What caused the flooding in Bangkok and Thailand?
A tropical depression that formed over Cambodia on September 24, 2026, combined with an already active seasonal monsoon to produce heavy, sustained rainfall across central Thailand, according to Wikipedia.
How many people were affected by the floods?
More than 2.6 million people across 940,300 households in 29 provinces plus Bangkok were affected, according to Department of Disaster Prevention and Mitigation data reported by Nation Thailand; roughly 700,000 of them were in Bangkok, per The Star.
How long did it take for Bangkok to drain?
Bangkok Governor Chadchart Sittipunt said it could take up to a week for floodwater to fully drain from the city, as quoted by The Star on September 29, 2026.
What is the estimated cost of the damage?
Property losses were estimated at more than 11 billion baht (about $327 million), according to Wikipedia's summary of the event.
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