Hail forecast for upper Thailand with very heavy rain in southern areas
Thundershowers are forecast across 70% of Bangkok and surrounding areas from 6pm on Friday to 6pm on Saturday. The South faces a flash flood risk from November 7–9.
- Unsettled weather, including thundershowers, gusty winds, and hail, is forecast for upper Thailand on November 6-7.
- Heavy to very heavy rain is predicted for southern Thailand from November 6-9, with authorities warning of potential flash floods and runoff.
- The weather pattern is caused by a high-pressure system from China, which is strengthening easterly winds over Thailand and the Gulf of Thailand.
- Mariners are advised to navigate with caution as waves are expected to exceed 2 metres in areas with thundershowers in the Andaman Sea and the Gulf of Thailand.
The Thai Meteorological Department issued an advisory at 5pm on Friday (November 6, 2026), forecasting unsettled weather in upper Thailand and heavy to very heavy rain in the South over the November 6–9 period.
The areas expected to see heavy or very heavy rain are listed below.
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, Chaiyaphum, Nong Bua Lam Phu, Khon Kaen and Nakhon Ratchasima.
Central
- Nakhon Sawan, Uthai Thani, Chai Nat, Lop Buri, Saraburi, Phra Nakhon Si Ayutthaya, Suphan Buri, Kanchanaburi, Ratchaburi, Nakhon Pathom, Samut Sakhon and Samut Songkhram, as well as Bangkok and surrounding areas.
East
- Nakhon Nayok, Chachoengsao, Chon Buri and Rayong.
- South
- East coast — Phetchaburi, Prachuap Khiri Khan, Chumphon, Surat Thani, Nakhon Si Thammarat, Songkhla, Pattani, Yala and Narathiwat.
- West coast — Trang and Satun.
November 7
Heavy rain
North
- Mae Hong Son, Chiang Mai, Chiang Rai, Lamphun, Lampang, Phayao, Phrae, Sukhothai, Tak and Kamphaeng Phet.
Central
- Nakhon Sawan, Uthai Thani, Chai Nat, Suphan Buri, Kanchanaburi and Ratchaburi.
South
- Phetchaburi, Prachuap Khiri Khan, Chumphon, Surat Thani, Nakhon Si Thammarat, Phatthalung, Songkhla, Pattani, Yala, Narathiwat, Trang and Satun.
November 8
Very heavy rain in the South
- Nakhon Si Thammarat, Songkhla and Narathiwat.
Heavy rain in the South
- Prachuap Khiri Khan, Surat Thani, Chumphon, Phatthalung, Pattani, Yala, Trang and Satun.
November 9
Very heavy rain in the South
- Surat Thani, Nakhon Si Thammarat, Phatthalung, Songkhla, Pattani and Narathiwat.
Heavy rain in the South
- Phetchaburi, Prachuap Khiri Khan, Chumphon, Yala, Ranong, Phang Nga, Phuket, Krabi, Trang and Satun.
Hail in upper Thailand and flash flood risk in the South
Unsettled weather is expected to continue in upper Thailand on November 6–7, with thundershowers, gusty winds, hail and isolated heavy rain.
The department urged people to take care in thundershowers and gusty winds, avoid open areas, keep clear of areas beneath large trees and stay away from unsecured billboards.
Rainfall is forecast to increase in the South from November 7–9, with heavy rain in many areas and isolated very heavy rain.
The department urged residents to watch for the effects of accumulated rain, which could trigger flash floods and rapid runoff from forested areas, particularly on slopes near waterways in the foothills and in low-lying areas.
Another high-pressure system, or cold air mass, from China is spreading over upper Thailand and the South China Sea.
This will strengthen easterly winds over Thailand and the Gulf of Thailand.
Waves will exceed 2 metres in areas with thundershowers in the Andaman Sea and the Gulf of Thailand.
The department advised mariners in both waters to check their routes, navigate with caution and avoid areas with thundershowers.
The department urged people to plan daily activities and journeys carefully during the advisory period to stay safe and reduce potential impacts.
It also asked people to keep following its advisories.
Updates are available around the clock on the department’s website or by calling 0-2399-4012-13 or 1182.
The next advisory is due at 5am on November 7.
Regional weather forecast
The department’s 24-hour forecast runs from 6pm on November 6 to 6pm on November 7. The November 6 list above identifies the areas where isolated heavy rain is forecast during this period.
North
- Thundershowers across 70% of the region, with gusty winds and hail.
- Minimum temperatures of 20–24°C.
- Maximum temperatures of 33–35°C.
- Southeasterly winds at 10–20 km/h.
Northeast
- Thundershowers across 40% of the region, with gusty winds.
- Minimum temperatures of 22–24°C.
- Maximum temperatures of 32–35°C.
- Easterly winds at 10–20 km/h.
Central
- Thundershowers across 70% of the region, with gusty winds and hail.
- Minimum temperatures of 21–25°C.
- Maximum temperatures of 34–35°C.
- Easterly winds at 10–20 km/h.
East
- Thundershowers across 60% of the region, with gusty winds.
- Minimum temperatures of 23–25°C.
- Maximum temperatures of 33–36°C.
- Southeasterly winds at 10–30 km/h.
- Waves below 1 metre, rising above 2 metres in thundershowers.
South, east coast
- Thundershowers across 70% of the area.
- Minimum temperatures of 22–25°C.
- Maximum temperatures of 31–35°C.
- From Surat Thani northwards, easterly winds at 15–30 km/h. Waves around 1 metre, rising above 2 metres in thundershowers.
- From Nakhon Si Thammarat southwards, southeasterly winds at 15–30 km/h. Waves around 1 metre, rising above 2 metres in thundershowers.
South, west coast
- Thundershowers across 60% of the area.
- Minimum temperatures of 23–25°C.
- Maximum temperatures of 33–35°C.
- Easterly winds at 15–30 km/h.
- Waves around 1 metre, rising above 1 metre offshore.
- Waves above 2 metres in thundershowers.
Bangkok and surrounding areas
- Thundershowers across 70% of the area, with gusty winds.
- Minimum temperatures of 24–25°C.
- Maximum temperatures of 33–35°C.
- Southeasterly winds at 10–20 km/h.
