Strengthening weather system approaching Thailand, anticipate heavy downpours
Thailand and the Andaman Sea are preparing for heavy rain and high waves due to a monsoon trough and a low-pressure system, according to the Thai Meteorological Department.
A depression near Luzon Island, Philippines, is expected to strengthen into a tropical storm, with a potential landfall in southern China between September 19 and 20, 2025. However, as of now, there are no available search results specifying a tropical weather disturbance expected to make landfall in South China on these dates.
In Thailand, the weather department has issued a warning for increased rainfall, particularly in the eastern provinces of Amnat Charoen, Ubon Ratchathani, Chanthaburi, and Trat. For the next 24 hours, strong rainfall is expected in the eastern areas, with a 70% chance of thunderstorms in Bangkok.
Over the next few days, from September 21 to 23, rainfall will increase in the northern and northeastern regions, with heavy rain expected in some areas. Residents in these regions should be alert to heavy rain and potential flash flooding.
In the Central Region, thunderstorms are expected in 70% of the area, with heavy rain in some parts, including Uthai Thani, Ayutthaya, Saraburi, Kanchanaburi, Suphan Buri, Ratchaburi, Samut Songkhram, Samut Sakhon, and Nakhon Pathom.
In the Northern Region, thunderstorms are expected in 60% of the area, with heavy rain in some parts, especially in Mae Hong Son, Chiang Mai, Lamphun, Lampang, Tak, Sukhothai, Phitsanulok, Kamphaeng Phet, Phichit, and Phetchabun.
In the Eastern Region, thunderstorms will affect 70% of the area, with heavy to very heavy rain in some parts, especially in Nakhon Nayok, Prachin Buri, Sa Kaeo, Chachoengsao, Chonburi, Rayong, Chanthaburi, and Trat. Similarly, in the Northeastern Region, thunderstorms will affect 70% of the area, with heavy rain in some areas, including Loei, Nong Khai, Bueng Kan, Yasothon, Amnat Charoen, Nakhon Ratchasima, Buri Ram, Surin, Si Sa Ket, and Ubon Ratchathani.
Mariners are urged to navigate with caution and avoid sailing in stormy conditions throughout this period. Waves in the upper Andaman Sea may reach around 2 metres from September 21 to 23, while in the lower Andaman Sea and upper Gulf of Thailand, waves may range from 1 to 2 metres. In the Andaman Sea, waves will be 1-2 metres high, with waves over 2 metres in areas with thunderstorms.
In the Southern Region (East Coast), thunderstorms will affect 40% of the area, with heavy rain in some parts, especially in Phetchaburi, Prachuap Khiri Khan, and Chumphon. On the other hand, in the Southern Region (West Coast), thunderstorms will affect 60% of the area, with heavy rain in some parts, especially in Ranong and Phang Nga.
Stay tuned for updates as the situation develops. Always prioritise safety and follow the advice of local authorities during weather events.
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