Thailand issues No 6 heavy rain advisory until October 25
Bangkok and other Thai regions face heavier rain and gusts on October 21–25, with flash flood and landslide risks in vulnerable areas.
- The Thai Meteorological Department has issued a weather advisory for heavy to very heavy rain in parts of Thailand, effective until October 25.
- The warning applies to various regions, including the South, East, Central (including Bangkok), and lower Northeast, with specific provinces at risk on different dates.
- Potential dangers include flash floods, landslides, strong gusts, and waves exceeding three meters in the Andaman Sea and Gulf of Thailand during thunderstorms.
The Thai Meteorological Department (TMD) issued Weather Advisory No. 6 (265/2026) at 5pm Thai time on October 19, 2026, warning of heavy to very heavy rain in parts of Thailand through October 25.
The TMD warned that intense and accumulated rainfall could cause flash floods, overflowing waterways, sudden run-off and landslides, particularly on foothill slopes near waterways and in low-lying areas. Residents in affected areas should also beware of strong gusts.
Southern and eastern Thailand face persistent rain
Southern and eastern Thailand are forecast to experience continuous rain during October 19–20, with isolated heavy to very heavy downpours, according to the TMD.
Rainfall is expected to increase during October 21–25 in the lower Northeast, the Central region including Bangkok and surrounding provinces, the East and the upper South. The TMD forecasts isolated heavy to very heavy rain and gusty winds in these regions.
The TMD advised people in affected areas to plan daily activities and journeys carefully and avoid routes prone to repeated flooding, particularly low-lying stretches where water can accumulate.
Monsoon trough and easterly winds bring rain to Thailand
A monsoon trough lies across the central part of southern Thailand, while the southwest monsoon is prevailing over the lower Andaman Sea, according to the TMD.
The TMD also expects another high-pressure system, or cold air mass, from China to extend over the upper North, the upper Northeast and the South China Sea, bringing easterly winds over Thailand and the Gulf of Thailand.
Thunderstorms could bring waves above three metres
Waves in the Andaman Sea and Gulf of Thailand are forecast to exceed three metres in areas affected by thunderstorms, the TMD warned. All vessels should proceed cautiously and avoid sailing through thunderstorms.
Daily rainfall outlook identifies provinces at risk
The TMD’s daily outlook for October 19–25 identifies the following provinces and areas at risk of heavy or very heavy rainfall.
October 19, 2026
- Very heavy rain, South: Chumphon, Surat Thani, Ranong and Phang Nga.
- Heavy rain, Central region: Phra Nakhon Si Ayutthaya, Suphan Buri, Kanchanaburi, Ratchaburi, Nakhon Pathom, Samut Sakhon and Samut Songkhram, as well as Bangkok and surrounding provinces.
- Heavy rain, East: Nakhon Nayok, Chachoengsao, Chon Buri, Rayong, Chanthaburi and Trat.
- Heavy rain, South: Prachuap Khiri Khan, Nakhon Si Thammarat, Phatthalung, Songkhla, Narathiwat, Yala, Phuket, Krabi, Trang and Satun.
October 20, 2026
- Heavy rain, East: Chon Buri, Rayong, Chanthaburi and Trat.
- Heavy rain, South: Phetchaburi, Prachuap Khiri Khan, Chumphon, Surat Thani, Ranong and Phang Nga.
October 21, 2026
- Very heavy rain, East: Chon Buri.
- Heavy rain, Northeast: Nakhon Ratchasima, Buri Ram and Ubon Ratchathani.
- Heavy rain, Central region: Ratchaburi, Samut Sakhon and Samut Songkhram, as well as Bangkok and surrounding provinces.
- Heavy rain, East: Chachoengsao, Rayong, Chanthaburi and Trat.
- Heavy rain, South: Phetchaburi, Prachuap Khiri Khan, Chumphon, Surat Thani, Nakhon Si Thammarat, Ranong and Phang Nga.
October 22, 2026
- Heavy rain, Central region: Ratchaburi, Samut Sakhon and Samut Songkhram, as well as Bangkok and surrounding provinces.
- Heavy rain, East: Chachoengsao, Chon Buri, Rayong, Chanthaburi and Trat.
- Heavy rain, South: Phetchaburi, Prachuap Khiri Khan, Chumphon, Surat Thani, Nakhon Si Thammarat, Ranong, Phang Nga and Krabi.
October 23, 2026
- Heavy rain, Central region: Kanchanaburi, Ratchaburi, Nakhon Pathom, Samut Sakhon and Samut Songkhram, as well as Bangkok and surrounding provinces.
- Heavy rain, East: Chachoengsao, Chon Buri, Rayong, Chanthaburi and Trat.
- Heavy rain, South: Phetchaburi, Prachuap Khiri Khan, Chumphon, Ranong, Phang Nga and Phuket.
October 24, 2026
- Very heavy rain, South: Phang Nga, Phuket and Krabi.
- Heavy rain, South: Prachuap Khiri Khan, Chumphon, Surat Thani, Nakhon Si Thammarat, Phatthalung, Ranong and Trang.
October 25, 2026
- Very heavy rain, South: Phang Nga, Phuket and Krabi.
- Heavy rain, South: Chumphon, Surat Thani, Nakhon Si Thammarat, Ranong and Trang.
Next TMD advisory due at 5am on October 20
The TMD’s next advisory is scheduled for 5am Thai time on October 20, 2026. Advisory No. 6 was signed by Nattawut Dandee, the department’s deputy director-general and acting director-general.
The TMD advised the public to monitor its announcements throughout the warning period. Weather information is available around the clock through the department’s website or by calling 02-399-4012, 02-399-4013 or 1182.
