Storms forecast in upper Thailand and very heavy rain in parts of South
Thundershowers, gusty winds and hail are forecast to reach the Northeast first, while rainfall in the South could trigger flash floods.
- Upper Thailand is expected to experience thundershowers, gusty winds, and isolated heavy rain from November 5 to 7.
- Rainfall in the South is forecast to increase from November 7 to 9, with heavy to very heavy rain and warnings of potential flash floods.
- The weather is caused by a high-pressure system from China, which will also lead to waves exceeding 2 meters in the Andaman Sea and Gulf of Thailand.
The Thai Meteorological Department issued a weather advisory at 5pm on Thursday (November 5, 2026), forecasting unsettled weather in upper Thailand and heavy to very heavy rain in the South from November 5 to 9.
Upper Thailand is expected to see thundershowers, gusty winds, hail and isolated heavy rain from November 5 to 7.
The Northeast will be affected first, followed by the North, the Central region, including Bangkok and its surrounding areas, and the East.
The department advised people to take precautions during storms and avoid open ground, areas beneath large trees and places near unsecured billboards.
Rainfall in the South is forecast to increase from November 7 to 9, with heavy rain in many areas and isolated very heavy rain.
The department advised residents to watch for flash floods and rapid run-off from the hills as rainfall accumulates, particularly on foothill slopes near waterways and in low-lying areas.
Another high-pressure system or cold air mass from China will spread over upper Thailand and the South China Sea, strengthening the easterly winds blowing across Thailand and the Gulf of Thailand.
Waves are expected to exceed 2 metres in areas with thundershowers in the Andaman Sea and the Gulf of Thailand.
Mariners in both waters were advised to navigate with caution and avoid those areas.
The department urged people to plan their daily activities and travel carefully to stay safe and minimise potential impacts, and to keep following its advisories.
Updates are available around the clock on 0-2399-4012-13 and 1182 and at www.tmd.go.th. The next advisory is due at 5am on November 6.
Provinces expected to be affected
November 5
Heavy rain
- North – Chiang Mai, Chiang Rai, Lamphun, Lampang, Phayao, Nan, Phrae, Uttaradit, Sukhothai, Tak, Kamphaeng Phet, Phitsanulok, Phichit and Phetchabun.
- Northeast – Loei, Nong Bua Lam Phu, Udon Thani, Nong Khai, Bueng Kan, Sakon Nakhon, Nakhon Phanom, Mukdahan, Yasothon, Kalasin, Khon Kaen, Chaiyaphum, Nakhon Ratchasima, Maha Sarakham, Roi Et, Amnat Charoen, Buri Ram, Surin, Si Sa Ket and Ubon Ratchathani.
- Central – Nakhon Sawan, Uthai Thani, Chai Nat, Sing Buri, Ang Thong, Lop Buri, Saraburi, Phra Nakhon Si Ayutthaya, Suphan Buri, Kanchanaburi, Ratchaburi, Nakhon Pathom, Samut Sakhon and Samut Songkhram, as well as Bangkok and its surrounding areas.
- East – Nakhon Nayok, Prachin Buri, Sa Kaeo, Chachoengsao, Chon Buri, Rayong, Chanthaburi and Trat.
- South – Phetchaburi, Prachuap Khiri Khan, Chumphon, Surat Thani, Nakhon Si Thammarat, Songkhla, Yala and Narathiwat.
November 6
Heavy rain
- North – Mae Hong Son, Chiang Mai, Chiang Rai, Lamphun, Lampang, Phayao, Nan, Phrae, Uttaradit, Sukhothai, Tak, Kamphaeng Phet, Phitsanulok, Phichit and Phetchabun.
- Northeast – Loei and Chaiyaphum.
- Central – The same areas as on November 5.
- East – Nakhon Nayok, Chachoengsao, Chon Buri and Rayong.
- South – Phetchaburi, Prachuap Khiri Khan, Chumphon, Surat Thani, Nakhon Si Thammarat, Phatthalung, Songkhla, Pattani, Yala and Narathiwat.
November 7
Heavy rain
- North – Mae Hong Son, Chiang Mai, Chiang Rai, Lamphun, Lampang, Phayao, Sukhothai, Tak and Kamphaeng Phet.
- Central – Nakhon Sawan, Uthai Thani, Chai Nat, Suphan Buri, Kanchanaburi and Ratchaburi.
- South – Phetchaburi, Chumphon, Surat Thani, Nakhon Si Thammarat, Phatthalung, Songkhla, Pattani, Yala, Narathiwat, Krabi, Trang and Satun.
November 8
Very heavy rain
- South – Nakhon Si Thammarat and Songkhla.
Heavy rain
- East – Chon Buri and Rayong.
- South – Phetchaburi, Prachuap Khiri Khan, Surat Thani, Chumphon, Phatthalung, Pattani, Yala, Narathiwat, Trang and Satun.
November 9
Very heavy rain
- South – Surat Thani, Nakhon Si Thammarat, Phatthalung, Songkhla, Pattani and Narathiwat.
Heavy rain
- South – Phetchaburi, Prachuap Khiri Khan, Chumphon, Yala, Ranong, Phang-nga, Phuket, Krabi, Trang and Satun.
