Heavy rain warning for four Thai Gulf coast provinces on October 31

The Thai Meteorological Department forecasts thundershowers across 60% of Bangkok and surrounding areas on October 31, 2026, and isolated heavy rain on the South’s east coast. The forecast is valid from 6am on October 31 until 6am on November 1.

Residents in southern Thailand should beware of thundershowers, heavy rain and accumulated rainfall that could trigger flash floods and runoff from higher ground, the Thai Meteorological Department warned. Foothill slopes near waterways and low-lying areas are particularly at risk.

Easterly winds over Thailand and the Gulf of Thailand are bringing continued thundershowers, particularly to the Central region, Bangkok and surrounding areas, the East and the South, according to the Thai Meteorological Department. A high-pressure system, or cold air mass, from China also covers upper Thailand and the South China Sea.

Mariners in the Andaman Sea and the Gulf of Thailand should navigate cautiously and avoid areas experiencing thundershowers, the Thai Meteorological Department advised, as waves could exceed two metres.

Southern thundershowers bring heavy rain risk to four provinces

Phetchaburi, Prachuap Khiri Khan, Chumphon and Surat Thani face isolated heavy rain, with thundershowers forecast across 60% of the South’s east coast. Minimum temperatures in the region will range from 23–24°C and maximums from 30–34°C.

Along the South’s east coast, easterly winds of 15–30km/h are forecast from Surat Thani northwards, while southeasterly winds of 15–30km/h are expected from Nakhon Si Thammarat southwards. Waves in both stretches will be around one metre, exceeding two metres in thundershowers.

The South’s west coast also has thundershowers forecast across 60% of its area, mainly in Ranong, Phang Nga, Phuket and Krabi. Minimum temperatures will be 23–24°C and maximums 32–36°C, with southeasterly winds of 15–35km/h. Waves will be around one metre, rising to one to two metres offshore and above two metres in thundershowers.

Bangkok and the East face 60% thundershower coverage

Bangkok and surrounding areas can expect thundershowers across 60% of the area, with minimum temperatures of 24–26°C and maximums of 32–35°C. Southeasterly winds will reach 10–20km/h.

The East will also see thundershowers across 60% of its area, mainly in Nakhon Nayok, Prachinburi, Chachoengsao, Chonburi, Rayong, Chanthaburi and Trat. Minimum temperatures will be 24–25°C and maximums 32–35°C, with southeasterly winds of 10–30km/h. Waves will be below one metre, rising above two metres in thundershowers.

Rain coverage ranges from 20% to 40% in the North, Northeast and Central region

The North has thundershowers forecast across 20% of its area, mainly in Tak, Kamphaeng Phet, Phichit, Phitsanulok and Phetchabun. Minimum temperatures will range from 21–25°C and maximums from 33–36°C, with easterly winds of 10–20km/h.

The Northeast can expect thundershowers across 30% of its area, mainly in Loei, Bueng Kan, Nakhon Phanom, Chaiyaphum, Nakhon Ratchasima, Buri Ram, Surin, Si Sa Ket and Ubon Ratchathani. Minimum temperatures will be 22–24°C and maximums 33–36°C, with easterly winds of 10–20km/h.

The Central region has thundershowers forecast across 40% of its area, mainly in Kanchanaburi, Uthai Thani, Ratchaburi, Suphanburi, Phra Nakhon Si Ayutthaya, Lopburi, Saraburi, Nakhon Pathom, Samut Sakhon and Samut Songkhram. Minimum temperatures will be 23–25°C and maximums 32–34°C, with easterly winds of 10–20km/h.