BANGKOK — Thailand’s Meteorological Department has issued its sixth warning for heavy to very heavy rain, with Bangkok and several provinces at risk of flooding through 13 September 2026.
The Meteorological Department issued Warning No. 6 (196/2026) on 9 September, warning that heavy to very heavy rain would affect parts of Thailand, particularly the North, Northeast, Central and eastern regions.
On 9 September, a high-pressure system or cool air mass extending over northern Vietnam and upper Laos is pushing the monsoon trough southward across the North, upper Central region and Northeast. Meanwhile, a moderate southwest monsoon is prevailing over the Andaman Sea, Thailand and the Gulf of Thailand.
From 10 to 13 September, persistent rain is expected across the lower Northeast, Central region, Bangkok and its surrounding provinces, the East and the South, with heavy to very heavy rain possible in some areas.
The North and upper Northeast are expected to see less rain as a high-pressure system from China spreads over the upper North and upper Northeast. The monsoon trough will shift southward across the lower Central region, lower Northeast and East before extending toward a strong low-pressure cell over the central South China Sea.
The southwest monsoon is also expected to strengthen over the Andaman Sea, the South and the Gulf of Thailand.
The department urged people in upper Thailand and the upper South to beware of heavy to very heavy rain and accumulated rainfall, which could trigger flash floods and runoff, particularly in foothill areas, near waterways and in low-lying areas.
People were advised to avoid routes that are prone to repeated flooding, especially low-lying roads where short-term inundation could occur.
Areas facing the heaviest rain
On 9 September, very heavy rain was forecast for Phitsanulok and Phetchabun in the North, and Loei, Nong Bua Lamphu, Chaiyaphum and Khon Kaen in the Northeast.
Heavy rain was also forecast across large parts of the North, Northeast, Central region and East, as well as Ranong and Phang Nga in the South. Bangkok and its surrounding provinces were also included in the heavy-rain warning.
On 10 September, very heavy rain was expected in Tak, Kamphaeng Phet, Nakhon Ratchasima, Buriram, Nakhon Sawan, Uthai Thani, Bangkok and its surrounding provinces, as well as parts of the East including Nakhon Nayok, Chanthaburi and Trat.
Heavy rain was expected across numerous provinces in all regions, including Chon Buri, Rayong, Phuket, Krabi, Phetchaburi, Prachuap Khiri Khan, Chumphon and Surat Thani.
On 11 September, very heavy rain was forecast in parts of the Central region, including Uthai Thani, Kanchanaburi, Ratchaburi, Nakhon Pathom, Samut Songkhram, Samut Sakhon and Bangkok and its surrounding provinces.
The East, including Rayong, Chanthaburi and Trat, and parts of the South including Phetchaburi, Prachuap Khiri Khan, Chumphon, Ranong and Phang Nga, were also expected to see very heavy rain.
On 12 September, very heavy rain was forecast for Uthai Thani, Suphan Buri, Saraburi and Kanchanaburi in the Central region, as well as Chanthaburi and Trat in the East.
Bangkok and its surrounding provinces remained under a heavy-rain forecast, along with areas across the North, Northeast, Central region, East and South.
On 13 September, very heavy rain was forecast in parts of the Central region, including Kanchanaburi, Uthai Thani, Suphan Buri, Ratchaburi, Nakhon Pathom, Samut Songkhram and Samut Sakhon.
Several eastern provinces, including Chachoengsao, Chon Buri, Rayong, Chanthaburi and Trat, were also expected to receive very heavy rain, along with Ranong and Phang Nga in the South.
Tropical cyclone threat
The Meteorological Department also warned that a strong low-pressure cell over the central South China Sea could intensify into a tropical cyclone between 11 and 13 September.
The system is expected to move closer to the coast of northern Vietnam around 14-15 September.
The department urged the public to closely monitor weather updates during this period and plan travel and daily activities with caution.
Weather updates are available at www.tmd.go.th or through the Meteorological Department’s hotlines at 0-2399-4012-13 and 1182, available 24 hours a day.