From 4-6 July, a warning has been issued for "heavy rain." The Department of Disaster Prevention and Mitigation (DDPM) has named 55 provinces in the North, Northeast, Central, and South to monitor for flash floods, sudden flooding, waterlogging, and landslides due to heavy rain.
On 4 July 2026 at 07:00, Mr. Theerapat Kachamat, Director-General of the Department of Disaster Prevention and Mitigation (DDPM), reported that the Central Disaster Prevention and Mitigation Command Center has been monitoring weather conditions and assessing risk factors. The Meteorological Department announced Tropical Storm "Maesak" No. 1 (104/2569) on 3 July 2026 at 05:00, stating that a depression in the upper South China Sea has strengthened into Tropical Storm "Maesak," expected to pass Hainan Island and make landfall in southern China between 4 and 6 July 2026. The storm's center will not enter Thailand, but the influence of "Maesak," a monsoon trough over northern and upper northeastern Thailand, along with a fairly strong southwest monsoon covering the Andaman Sea, Thailand, and the Gulf of Thailand, will affect the country.
As a result, from 3 to 6 July 2026, Thailand will experience increased rainfall, with heavy to very heavy rain in some areas, especially in the North, Northeast, Central, and South regions. The upper Andaman Sea will have stronger winds with waves 2 to 3 meters high, and in areas with thunderstorms, waves may exceed 3 meters. The lower Andaman Sea and upper Gulf of Thailand will have waves about 2 meters high, rising above 2 meters in thunderstorms.
Areas expected to have heavy rain with possible flash floods, sudden flooding, waterlogging, landslides, and strong waves from 4 to 6 July 2026 are divided as follows.
These include Mae Hong Son, Chiang Mai, Chiang Rai, Lamphun, Lampang, Phayao, Phrae, Nan, Uttaradit, Tak, Sukhothai, Kamphaeng Phet, Phitsanulok, Phichit, Phetchabun, Nakhon Sawan, and Uthai Thani provinces.
These include Loei, Nong Khai, Bueng Kan, Nong Bua Lam Phu, Udon Thani, Sakon Nakhon, Nakhon Phanom, Mukdahan, Yasothon, Amnat Charoen, Nakhon Ratchasima, Buriram, Surin, Sisaket, and Ubon Ratchathani provinces.
These include Kanchanaburi, Ratchaburi, Suphan Buri, Lopburi, Saraburi, Nakhon Nayok, Prachinburi, Sa Kaeo, Chachoengsao, Chonburi, Rayong, Chanthaburi, Trat, Phetchaburi, and Prachuap Khiri Khan provinces.
These include Chumphon, Surat Thani, Ranong, Phang Nga, Phuket, Krabi, Trang, and Satun provinces.
Southern region: 4 provinces, including Ranong (Mueang Ranong, Suk Samran, and Kapoe districts), Phang Nga (Ko Khao, Takua Thung, Thai Muang, Takua Pa, and Khura Buri districts), Phuket (all districts), and Krabi (Mueang Krabi, Khlong Thom, Ko Lanta, Nuea Khlong, and Ao Luek districts).
The Central Disaster Prevention and Mitigation Command Center, under the DDPM, has coordinated to notify 55 provinces in the North, Northeast, Central, and South regions, as well as regional disaster prevention centers in high-risk areas, to prepare for increased rainfall and heavy to very heavy rain that may cause flooding.
Authorities have been instructed to assign personnel to closely monitor weather, rainfall, and water conditions; deploy disaster response teams with machinery to high-risk areas for timely assistance; particularly focus on areas with over 90 millimeters of accumulated rain in 24 hours. Areas frequently flooded should accelerate water drainage to minimize impact, and temporary shelters should be prepared to accommodate evacuees adequately.
Regarding natural tourist sites, especially caves and waterfalls, if there is a risk of disasters, authorities should announce warnings and close access. In cases of strong waves and winds, related agencies should issue announcements or install warning signals along coastlines, strictly prohibiting tourists from swimming. Fishermen, boat operators, and passenger vessel services should be advised to exercise increased caution.
If the situation worsens, a total ban on navigation should be considered. Officials must monitor high-risk areas and provide immediate assistance 24 hours a day. Provinces are urged to publicize weather updates and official news closely and alert residents in vulnerable areas in advance to prepare and follow government guidance strictly.
At this time, the public should continuously monitor weather conditions, warning announcements, water situations, and official news. They can follow alerts via the "THAI DISASTER ALERT" app, report incidents via the LINE "DDPM Incident Report 1784," or call the 24-hour emergency hotline 1784 for coordination and assistance.
