TMD forecasts heavy rain in 14 southern provinces on Nov 12, cool upper Thailand and partly cloudy Bangkok
Chumphon, Surat Thani and Nakhon Si Thammarat face very heavy rain, while small boats in Thailand’s lower Gulf should stay ashore.
- The Thai Meteorological Department forecasts heavy to very heavy rain in 14 southern provinces on November 12, with warnings of potential flash floods and rapid run-off.
- Upper Thailand is expected to experience cool weather, particularly in the mornings, with temperatures on northern mountaintops forecast to fall as low as 9°C.
- Bangkok and its surrounding provinces are predicted to be partly cloudy, with temperatures ranging between 23°C and 33°C.
- Due to the weather, small boats in the lower Gulf of Thailand have been advised to remain ashore as waves could reach over 3 metres during thundershowers.
The Thai Meteorological Department (TMD) forecast isolated heavy to very heavy rain in 14 southern provinces on 12 November 2026, with accumulated rainfall threatening flash floods and rapid run-off. The forecast covers the period from 6am on 12 November to 6am on 13 November, Thai time.
The TMD urged residents in southern Thailand to remain alert to thundershowers and prolonged heavy rainfall, particularly those living on foothill slopes near waterways and in low-lying areas.
Upper Thailand is expected to remain cool in the morning, with rain in parts of the upper North and minimum temperatures on northern mountaintops forecast to fall as low as 9°C.
Very heavy rain forecast for three southern provinces
Chumphon, Surat Thani and Nakhon Si Thammarat face isolated very heavy rain, according to the TMD’s forecast for the South’s east coast. Thundershowers are expected across 70% of the region, with isolated heavy rain in Phatthalung, Songkhla, Pattani, Yala and Narathiwat.
Minimum temperatures along the southern east coast are forecast at 22–24°C, with maximum temperatures of 28–32°C.
On the southern west coast, thundershowers are expected across 60% of the region, with isolated heavy rain in Ranong, Phang Nga, Phuket, Krabi, Trang and Satun. Minimum temperatures are forecast at 23–25°C and maximum temperatures at 30–34°C.
Small boats in lower Gulf advised to stay ashore
The TMD advised small boats in the lower Gulf of Thailand to remain ashore as winds and waves strengthen across the Gulf and the Andaman Sea. Mariners should navigate cautiously and avoid areas experiencing thundershowers.
Along the Gulf coast from Surat Thani northwards, easterly winds are forecast at 15–35km/h. Waves are expected to reach 1–2 metres, rising above 2 metres in thundershowers.
From Nakhon Si Thammarat southwards, south-easterly winds are forecast at 20–40km/h, with waves of 2–3 metres and more than 3 metres in thundershowers.
Along the Andaman coast, easterly winds are expected at 15–35km/h. Waves are forecast at about 1 metre near the coast and 1–2 metres offshore, exceeding 2 metres in thundershowers.
Northern mountaintops could see temperatures of 9°C
Northern Thailand’s mountaintops are forecast to experience cold conditions, with minimum temperatures of 9–15°C. Across the North, mornings will be cool and temperatures will fall slightly, with regional minimums of 16–22°C and maximums of 23–31°C.
Rain is expected across 30% of the North, mainly in Mae Hong Son, Chiang Mai, Chiang Rai, Lamphun, Lampang, Phayao, Nan and Uttaradit. North-westerly winds are forecast at 10–25km/h.
The Northeast will have cool mornings and isolated light rain, with minimum temperatures of 17–20°C and maximum temperatures of 28–31°C. Mountaintops will be cold, with minimums of 10–14°C, while north-easterly winds are expected at 10–30km/h.
Central Thailand is forecast to have cool mornings and isolated light rain. Minimum temperatures will range from 20–23°C and maximum temperatures from 29–32°C, with north-westerly winds of 10–25km/h.
The East will also have cool mornings and isolated light rain, with minimum temperatures of 20–24°C and maximum temperatures of 30–34°C. North-easterly winds are forecast at 15–30km/h, with waves of about 1 metre near the coast and more than 1 metre offshore.
Bangkok and surrounding provinces are expected to remain partly cloudy, with minimum temperatures of 23–25°C and maximum temperatures of 31–33°C. North-easterly winds will reach 10–25km/h.
A relatively strong high-pressure system continues to cover upper Thailand and the South China Sea, while a westerly trough is moving across Myanmar, northern Thailand and upper Laos. A moderate north-east monsoon is prevailing over the Gulf, southern Thailand and the Andaman Sea.
The TMD advised people in upper Thailand to take care of their health in the colder weather and urged farmers to prepare measures to protect agricultural produce from possible damage.
