Twelve provinces in southern Thailand face increased flood risks
More rain could raise water levels in 12 southern provinces, while thunderstorms, strong gusts and lightning are forecast in upper Thailand.
- Thailand's Meteorological Department has issued a weather warning for southern provinces, effective until October 28, due to forecasts of heavy to very heavy rain.
- Twelve specific provinces are highlighted for increased risk of flash floods and runoff, including Surat Thani, Nakhon Si Thammarat, Phatthalung, Songkhla, Phuket, and Krabi.
- The severe weather is caused by a strengthening monsoon trough, which is also expected to generate waves exceeding 2 meters in the Andaman Sea and the Gulf of Thailand.
- Residents in affected areas are advised to be cautious of accumulated rainfall, especially on foothill slopes and in low-lying areas.
The Thai Meteorological Department (TMD) issued a weather warning at 5pm on Monday (October 26, 2026), effective until October 28.
Continuing rain is forecast in the South during this period, with heavy falls in many areas and very heavy rain in some locations, while upper Thailand faces unsettled weather.
Residents were advised to beware of accumulated rainfall that could cause flash floods and runoff from higher ground, particularly on foothill slopes near waterways and in low-lying areas where water could accumulate.
Upper Thailand is forecast to experience unsettled weather on October 26–27, initially bringing thunderstorms, strong gusts and heavy rain, with lightning in some areas.
Rainfall in the Northeast will then decrease.
Residents were advised to avoid open areas and places beneath large trees or unsecured billboards.
A high-pressure system, or cold air mass, from China has spread over upper Thailand and the South China Sea, bringing easterly winds that carry moisture from the South China Sea and the Gulf of Thailand into upper Thailand.
Meanwhile, the monsoon trough lying over the South is set to strengthen.
Waves in the Andaman Sea and the Gulf of Thailand are expected to exceed 2 metres in areas with thunderstorms.
Mariners in both seas were advised to navigate cautiously and avoid sailing through thunderstorms.
People were advised to plan their daily activities and travel carefully during this period to stay safe and reduce potential impacts, and to monitor TMD announcements.
Information is available around the clock through the department’s website or by calling 0-2399-4012-13 or 1182.
The next announcement is due at 5am on October 27.
Areas forecast to receive heavy to very heavy rain
October 26
Very heavy rain
- Surat Thani, Nakhon Si Thammarat, Phatthalung, Songkhla, Phang Nga, Phuket, Krabi, Trang and Satun.
Heavy rain
- Northern region: Chiang Mai, Chiang Rai, Lamphun, Lampang, Phayao, Nan, Uttaradit, Sukhothai, Tak, Kamphaeng Phet, Phitsanulok and Phetchabun.
- Central region: Nakhon Sawan, Uthai Thani, Lopburi, Saraburi, Phra Nakhon Si Ayutthaya, Suphan Buri, Kanchanaburi, Ratchaburi and Nakhon Pathom, as well as Bangkok and surrounding provinces.
- Eastern region: Nakhon Nayok, Prachinburi, Chachoengsao, Chonburi, Rayong and Chanthaburi.
- Southern region: Chumphon, Pattani, Yala, Narathiwat and Ranong.
October 27
Heavy rain
- Northern region: Tak and Kamphaeng Phet.
- Central region: Kanchanaburi, Ratchaburi, Nakhon Pathom, Samut Sakhon and Samut Songkhram, as well as Bangkok and surrounding provinces.
- Southern region: Phetchaburi, Chumphon, Surat Thani, Nakhon Si Thammarat, Phatthalung, Songkhla, Pattani, Yala, Narathiwat, Krabi, Trang and Satun.
October 28
Heavy rain
- Southern region: Chumphon, Surat Thani, Nakhon Si Thammarat, Phatthalung, Songkhla, Pattani, Narathiwat, Ranong, Phang Nga and Phuket.
Further rain warning for 12 southern provinces
The TMD warned of further rain in 12 southern provinces, namely Phang Nga, Phuket, Krabi, Trang, Satun, Surat Thani, Nakhon Si Thammarat, Phatthalung, Songkhla, Pattani, Yala and Narathiwat. Additional rain could raise water levels, particularly in areas already flooded or affected by prolonged rainfall. The latest rain radar images are available at weather.tmd.go.th.
