According to the Thai Meteorological Department, a severe weather advisory has been issued warning of heavy to very heavy rainfall across Thailand affecting 16 high-risk provinces through July 30, 2026. The active monsoon trough lies across the northern and northeastern regions, combining with a relatively strong southwest monsoon that covers the Andaman Sea, Thailand, and the Gulf of Thailand.
The national weather agency warns that accumulated rainfall could trigger flash floods and forest runoffs, particularly in foothill areas near waterways and low-lying tracts. Marine conditions in the upper Andaman Sea feature waves measuring 2 to 3 meters, exceeding 3 meters in thundershowers, while the upper Gulf of Thailand and the lower Andaman Sea experience waves of about 2 meters and over 2 meters in thundershowers. Officials advise all vessels in the Andaman Sea and the Gulf of Thailand to proceed with caution and avoid storm-affected areas, with small boats in the upper Andaman Sea instructed to stay ashore during this period.
Severe Rainfall Impact Areas and Regional Breakdowns
The weather alert details specific provinces expected to bear the brunt of the severe conditions between July 29 and July 30, 2026. For very heavy rain, authorities list provinces in the Northeast including Nong Khai, Bueng Kan, Kalasin, Maha Sarakham, Roi Et, Yasothon, Amnat Charoen, and Ubon Ratchathani. In the East, Sa Kaeo, Chachoengsao, Rayong, Chanthaburi, and Trat face the highest alert levels, alongside Ranong, Phang Nga, and Phuket in the South.
Meanwhile, general heavy rainfall is expected across multiple other territories. The North faces risks in Mae Hong Son, Chiang Mai, Chiang Rai, Lampang, Phayao, Nan, Phrae, Uttaradit, Tak, Kamphaeng Phet, Phitsanulok, Phichit, and Phetchabun. Northeastern provinces under the heavy rain watch include Loei, Nong Bua Lam Phu, Khon Kaen, Udon Thani, Sakon Nakhon, Nakhon Phanom, Mukdahan, Chaiyaphum, Nakhon Ratchasima, Buriram, Surin, and Si Sa Ket.
Central areas including Kanchanaburi, Nakhon Sawan, Uthai Thani, Lopburi, Saraburi, Phra Nakhon Si Ayutthaya, and the Bangkok metropolitan region also face precipitation risks. Eastern provinces named are Nakhon Nayok, Prachinburi, and Chonburi, while southern alerts cover Prachuap Khiri Khan, Chumphon, Surat Thani, Nakhon Si Thammarat, Phatthalung, Krabi, and Trang.
Did You Know? The Thai Meteorological Department operates a 24-hour public service network through its official website and telephone hotlines at 0-2399-4012-13 and 1182 to provide continuous weather updates.
Safety Precautions and Official Guidance
To mitigate potential impacts, the weather authority urges residents in vulnerable zones to plan their daily routines and travel arrangements carefully. Mariners navigating the Andaman Sea and Gulf of Thailand must avoid thundershowers, and small craft operators in upper Andaman waters must remain in port for safety.
Frequently Asked Questions
When does the current weather warning expire?
The advisory remains in effect until July 30, 2026.
Which marine areas face the highest wave heights?
The upper Andaman Sea experiences waves of 2 to 3 meters, rising above 3 meters in areas with thundershowers.
How can citizens contact the meteorological agency for updates?
The public can check updates via the official website at http://www.tmd.go.th or call the 24-hour hotlines at 0-2399-4012-13 and 1182.
How are you planning to adjust your travel and daily routines during this multi-province severe weather alert?
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