Intensifying southwest monsoon to bring heavy rainfall throughout Thailand
Heavy Rainfall Forecasted Across Thailand Due to Intensifying Southwest Monsoon
The Thai Meteorological Department has issued a warning for heavy to very heavy rainfall in several regions of Thailand, including the North, Northeast, East, South (west coast), and Central regions, from August 15 to 25, 2025.
From August 15 to 18, the South (east coast), including Phetchaburi, Prachuap Khiri Khan, Chumphon, Surat Thani, Nakhon Si Thammarat, and Songkhla, will experience fairly widespread thundershowers and isolated heavy rains. Minimum temperatures in this region will be between 24-26°C, and maximum temperatures will be between 32-34°C. Waves in this region will be about a metre high and above 2 metres high in thundershowers. Farmers have been advised to improve drainage systems in their agricultural areas to mitigate potential damage to crops and livestock.
The East region, including Nakhon Nayok, Sa Kaeo, Prachin Buri, Chachoengsao, Chonburi, Rayong, Chanthaburi, and Trat, will experience fairly widespread thundershowers and isolated heavy to very heavy rains. Minimum temperatures will be between 24-27°C, and maximum temperatures will be between 31-34°C. Waves in this region will be about a metre high and above 2 metres high in thundershowers.
The Bangkok metropolitan area will experience fairly widespread thundershowers and isolated heavy rains. Minimum temperatures will be between 25-27°C, and maximum temperatures will be between 33-36°C.
The Central region, including Nakhon Sawan, Uthai Thani, Chai Nat, Sing Buri, Lop Buri, Ang Thong, Saraburi, Suphan Buri, Ayutthaya, Kanchanaburi, Ratchaburi, Nakhon Pathom, Samut Songkhram, and Samut Sakhon, will experience fairly widespread thundershowers and isolated heavy to very heavy rains.
The South (west coast), including Ranong, Phang Nga, Phuket, Krabi, Trang, and Satun, will experience fairly widespread thundershowers and isolated heavy to very heavy rains.
All ships are advised to proceed with caution and avoid thundershowers, while small boats should stay ashore. Mariners in the Andaman Sea and Gulf of Thailand are advised to exercise caution due to strong winds and high waves during this period.
From August 19, the monsoon trough shifts northward, weakening the southwest monsoon somewhat and resulting in less widespread rain but still isolated heavy rains, especially in the Northeast and East regions. From August 21 to 25, the moderate southwest monsoon returns with more rains and isolated heavy rains in the North, upper Central, and Northeast regions.
In the North, there will be fairly widespread thundershowers and isolated heavy to very heavy rains in several provinces, including Mae Hong Son, Chiang Rai, Chiang Mai, Lamphun, Lampang, Phayao, Phrae, Nan, Uttaradit, Sukhothai, Tak, Kamphaeng Phet, Phitsanulok, Phichit, and Phetchabun.
The Northeast region, including Loei, Nong Khai, Bueng Kan, Nong Bua Lamphu, Udon Thani, Sakon Nakhon, Nakhon Phanom, Chaiyaphum, Khon Kaen, Kalasin, Mukdahan, Maha Sarakham, Roi Et, Yasothon, and Amnat Charoen, will experience fairly widespread thundershowers and isolated heavy to very heavy rains.
The Thai Meteorological Department has advised people in affected areas to be cautious of flash floods and overflows, particularly along waterways, near foothills, and in lowland areas. People are also advised to stay updated on the weather conditions and follow any safety instructions issued by local authorities.
The heavy rainfall forecasted across Thailand could potentially disrupt political rallies and campaigns in the affected areas, especially with the general election scheduled for August 30, 2025.
Although the heavy rainfall might cause temporary hindrances in normal business operations in Thailand due to flooding and transportation issues, it is expected that most businesses will take the necessary precautions to minimize disruptions.
