Rain forecast for 36 Thai provinces as South faces flash flood risk
Thundershowers are forecast in 36 Thai provinces and Bangkok on October 29–30, with heavy rain raising flash flood risks in the South.
- The Thai Meteorological Department has forecast rain and thundershowers for 36 provinces, including Bangkok.
- Southern Thailand faces a significant risk of flash floods and rapid run-off due to predictions of heavy to very heavy rainfall.
- Residents in at-risk areas, especially on foothill slopes and in low-lying areas, have been advised to take precautions.
- Mariners in the Andaman Sea and Gulf of Thailand are also warned of hazardous conditions, with waves potentially exceeding two meters during thundershowers.
Heavy rain forecast in southern Thailand could trigger flash floods and rapid run-off, the Thai Meteorological Department (TMD) has warned, with thundershowers expected in parts of 36 provinces and Bangkok.
The forecast, issued on October 29, 2026, covers the period from 6pm on October 29 to 6pm on October 30.
Rain is expected to continue in the South, with isolated heavy to very heavy falls. Elsewhere, thundershowers and localised gusty winds are forecast in upper Thailand, particularly the Central region, including Bangkok and its vicinity, and the East.
The department advised residents to take precautions against thundershowers, heavy rain and accumulated rainfall, especially on foothill slopes near waterways and in low-lying areas.
A low-pressure area over the Andaman Sea and easterly winds over Thailand and the Gulf of Thailand are contributing to the wet conditions. A high-pressure system, or cold air mass, from China is also covering upper Thailand and the South China Sea.
Mariners in the Andaman Sea and Gulf of Thailand should check conditions along their routes, navigate cautiously and avoid thundershowers, where waves could exceed two metres.
Southern east coast
Thundershowers are forecast in 70% of the region, with isolated very heavy rain in Prachuap Khiri Khan and Chumphon.
Isolated heavy rain is expected in Phetchaburi, Surat Thani, Nakhon Si Thammarat, Phatthalung, Songkhla, Pattani, Yala and Narathiwat. Minimum temperatures are forecast at 22–24°C and maximum temperatures at 29–33°C.
From Surat Thani northwards, easterly winds are expected at 15–35 km/h, with waves of 1–2 metres. From Nakhon Si Thammarat southwards, southeasterly winds are forecast at 15–30 km/h, with waves of about one metre. Waves could exceed two metres in thundershowers in both areas.
Southern west coast
Thundershowers are expected in 70% of the region, with isolated very heavy rain in Phuket and isolated heavy rain in Ranong, Phang Nga, Krabi and Trang.
Minimum temperatures are forecast at 23–24°C and maximum temperatures at 30–34°C.
From Phang Nga northwards, easterly winds are expected at 20–35 km/h, with waves of about two metres. From Phuket southwards, southwesterly winds are forecast at 15–35 km/h, with waves of 1–2 metres. Waves could exceed two metres in thundershowers in both areas.
Bangkok and surrounding provinces
Thundershowers are forecast in 40% of Bangkok and its vicinity, with gusty winds in some areas.
Minimum temperatures are expected at 25–26°C and maximum temperatures at 33–35°C, with easterly winds of 10–20 km/h.
Central region
Thundershowers are expected in 30% of the region, with gusty winds in some areas, mainly in Kanchanaburi, Ratchaburi, Nakhon Pathom, Samut Sakhon and Samut Songkhram.
Minimum temperatures are forecast at 23–26°C and maximum temperatures at 33–35°C, with easterly winds of 10–20 km/h.
Eastern region
Thundershowers are forecast in 40% of the region, with gusty winds in some areas, particularly in Nakhon Nayok, Chachoengsao, Chon Buri, Rayong, Chanthaburi and Trat.
Minimum temperatures are expected at 23–26°C and maximum temperatures at 32–34°C. Easterly winds are forecast at 10–30 km/h, with waves below one metre, rising to more than two metres in thundershowers.
Northern region
Thundershowers are expected in 10% of the region, mainly in Tak, Kamphaeng Phet, Phichit and Phetchabun.
Minimum temperatures are forecast at 21–25°C and maximum temperatures at 33–35°C, with easterly winds of 10–20 km/h.
Northeastern region
Thundershowers are forecast in 10% of the region, particularly in Chaiyaphum, Nakhon Ratchasima, Buri Ram, Surin, Si Sa Ket and Ubon Ratchathani.
Minimum temperatures are expected at 22–24°C and maximum temperatures at 33–35°C, with northeasterly winds of 10–25 km/h.
