BANGKOK — 2 June 2026, Thailand’s Meteorological Department warned of continued heavy rainfall across much of the country on 2 June, with 37 provinces facing storm risks as strong monsoon conditions affect both land and sea areas.
In its 24-hour forecast, the department said a moderately strong south-west monsoon covering the Andaman Sea, Thailand and the Gulf of Thailand, combined with a strong low-pressure system near Vietnam’s central coast, would bring widespread rain and isolated heavy to very heavy downpours.
The western side of southern Thailand is expected to face the most severe conditions.
Authorities urged residents in affected areas to prepare for possible flash floods and forest runoff, particularly in low-lying zones and areas near waterways.
Strong winds were also forecast over the upper Andaman Sea, from Phuket northwards, where waves are expected to reach 2-3 metres and exceed 3 metres in storm areas.
In the lower Andaman Sea, from Krabi southwards, and the upper Gulf of Thailand, waves are forecast at around 2 metres, rising above 2 metres during thunderstorms.
The department advised mariners to exercise caution and avoid sailing in areas experiencing thunderstorms. Small boats in the upper Andaman Sea were advised to remain ashore.
The weather agency forecast thunderstorms covering about 40% of northern and northeastern Thailand, with isolated heavy rain expected in provinces including Tak, Kamphaeng Phet, Nong Khai, Udon Thani, Sakon Nakhon, Nakhon Ratchasima and Ubon Ratchathani.
Central Thailand, eastern Thailand, the eastern coast of the south, and Bangkok and surrounding provinces are forecast to see thunderstorms across about 60% of their areas, with isolated heavy rain.
Provinces at risk include Kanchanaburi, Ratchaburi, Suphan Buri, Nakhon Pathom, Chon Buri, Rayong, Chanthaburi, Trat, Phetchaburi, Prachuap Khiri Khan, Chumphon and Surat Thani.
The south-western coast is expected to experience the heaviest weather, with thunderstorms forecast across 80% of the region and heavy to very heavy rainfall likely in Ranong, Phangnga, Phuket, Krabi, Trang and Satun.
Bangkok and neighbouring provinces are forecast to experience thunderstorms across 60% of the metropolitan area, with some districts expected to see heavy rain, the department said.































































