TMD forecasts very heavy rain in 3 provinces on November 13

The Thai Meteorological Department (TMD) has forecast isolated very heavy rain in Prachuap Khiri Khan, Chumphon and Surat Thani on November 13, 2026, with heavy and accumulated rainfall posing risks of flash floods and rapid run-off in southern Thailand.

The TMD’s 24-hour forecast covers the period from 6am on November 13 to 6am on November 14, Thai time.

Residents in southern Thailand should remain alert to flooding, particularly on foothill slopes near waterways and in low-lying areas, the TMD advised.

A relatively strong high-pressure system covering upper Thailand and the South China Sea is weakening, allowing temperatures in upper Thailand to rise, according to the TMD. A moderate northeast monsoon continues to prevail over the Gulf of Thailand and the South.

Thundershowers expected across both southern coasts

The TMD expects thundershowers to cover 70% of southern Thailand’s east coast and 60% of its west coast in the November 13–14 forecast.

- South, east coast: Isolated heavy rain is forecast in Phetchaburi, Nakhon Si Thammarat, Phatthalung, Songkhla, Pattani, Yala and Narathiwat. Minimum temperatures will range from 21–25°C and maximum temperatures from 27–34°C.

- South, west coast: Isolated heavy rain is expected in Ranong, Phang Nga, Krabi, Trang and Satun. Minimum temperatures will range from 23–25°C and maximum temperatures from 27–34°C.

Lower Gulf seas ease but thundershowers remain a risk

Wind and sea conditions in the lower Gulf are easing to moderate levels, according to the TMD. Mariners in both the Gulf of Thailand and the Andaman Sea should check their routes, navigate cautiously and avoid areas with thundershowers.

- Gulf coast from Surat Thani northwards: Northeasterly winds will reach 15–35 km/h, with waves of 1–2 metres, exceeding 2 metres in thundershowers.

- Gulf coast from Nakhon Si Thammarat southwards: Easterly winds will reach 20–35 km/h, with waves of about 2 metres, exceeding 2 metres in thundershowers.

- Andaman coast: Easterly winds will reach 15–35 km/h, with waves of about 1 metre, rising to 1–2 metres offshore and exceeding 2 metres in thundershowers.

Bangkok temperatures to rise as upper Thailand warms

Bangkok and surrounding provinces are expected to be mostly cloudy with isolated rain and a temperature rise of 1–2°C, according to the TMD’s November 13–14 forecast. Minimum temperatures will be 24–26°C and maximum temperatures 31–33°C, with easterly winds of 10–20 km/h.

The TMD’s regional outlook for November 13–14 also includes:

- North: Cool mornings with light mist and isolated rain are expected, with minimum temperatures of 18–24°C and maximum temperatures of 26–33°C. Mountaintops will remain cold, with minimum temperatures of 10–15°C, while northeasterly winds will reach 10–20 km/h.

- Northeast: Temperatures will rise by 1–2°C, although mornings will remain cool with light mist and isolated rain. Minimum temperatures will be 20–24°C and maximum temperatures 30–33°C, with cool to cold conditions on mountaintops and minimum temperatures of 11–17°C. Northeasterly winds will reach 10–25 km/h.

- Central region: Mostly cloudy conditions, isolated rain and a temperature rise of 1–2°C are expected. Minimum temperatures will be 22–25°C and maximum temperatures 31–33°C, with easterly winds of 10–20 km/h.

- East: Mostly cloudy conditions, isolated rain and a temperature rise of 1–2°C are expected, with minimum temperatures of 23–26°C and maximum temperatures of 32–34°C. Northeasterly winds will reach 15–30 km/h, with waves of about 1 metre, exceeding 1 metre offshore.

The TMD advised people across upper Thailand to take care of their health amid changing weather conditions and urged farmers to prepare measures to protect agricultural produce from possible damage.