Meteorological Department Issues 7th Warning of Heavy to Very Heavy Rainfall June 29 - July 3; Lists Affected Provinces

The Thai Meteorological Department issued its 7th weather advisory on June 29, 2026, warning of heavy to very heavy rainfall across Thailand and strong winds in the upper Andaman Sea from June 29 to July 3. The eastern region and western coast of the south will experience the heaviest rainfall due to a monsoon trough passing over the northern and northeastern regions combined with the strengthening southwest monsoon over the Andaman Sea and Gulf of Thailand.

Residents in affected areas are warned of the dangers from intense accumulated rainfall, which could cause sudden flash floods and torrential flooding, particularly in foothill areas near water channels and low-lying terrain. In the upper Andaman Sea, waves are expected to reach 2-3 meters, exceeding 3 meters in thunderstorm areas. The lower Andaman Sea and upper Gulf of Thailand will see waves around 2 meters, exceeding 2 meters during thunderstorms.

Boaters in the Andaman Sea and Gulf of Thailand are advised to exercise caution and avoid areas with thunderstorms. Small boats in the upper Andaman Sea should remain ashore during this period. The public is urged to carefully plan daily activities and travel during this time.

Affected provinces include: June 29: Chanthaburi and Trat (very heavy rain); Ranong and Phangnga (very heavy rain); plus Mae Hong Son, Chiang Rai, Phayao, Nan, Uttaradit, Tak, Phitsanulok, Loei, Nong Khai, Bueng Kan, Udon Thani, Sakon Nakhon, Nakhon Phanom, Mukdahan, Yasothon, Amnat Charoen, Ubon Ratchathani, Nakhon Sawan, Lopburi, Saraburi, Phra Nakhon Si Ayutthaya, Kanchanaburi, Ratchaburi, Nakhon Pathom, Samut Sakhon, Bangkok and surrounding areas, Nakhon Nayok, Prachuap Khiri Khan, Sa Kaew, Chachoengsao, Rayong, Chumphon, Surat Thani, Nakhon Si Thammarat, Phatthalung, Yala, Narathiwat, Phuket, Krabi, Trang, and Satun (heavy rain).

June 30: Similar patterns with slightly adjusted province listings.