Heavy rainfall is anticipated across Thailand as the southwest monsoon continues to affect the Andaman Sea and western regions of the country, according to forecasts from the Thai Meteorological Department. Residents, particularly in the southern and upper regions, have been advised to remain vigilant, as heavy rain and water accumulation pose risks for flash floods and overflow incidents, especially in areas adjacent to foothills, waterways, and low-lying regions.

The prevailing weather pattern also includes southeasterly and southerly winds influencing the lower North, Northeast, Central region including the Bangkok metropolitan area, the East, and the Gulf of Thailand. Wind conditions in the South are reported to be moderate, producing waves in the Andaman Sea that may reach heights of 1–2 meters, and over 2 meters during thunderstorms. Vessels have been cautioned to navigate carefully and to avoid regions experiencing thunderstorm activity.

The weather forecast for the next 24 hours categorizes potential precipitation by region:

• North: Fairly widespread thundershowers and isolated heavy rains are expected in Mae Hong Son, Chiang Mai, Chiang Rai, Lamphun, Lampang, Phrae, Nan, Tak, Sukhothai, Kamphaeng Phet, Phichit, Phitsanulok, and Phetchabun, with minimum temperatures ranging from 22-25 degrees Celsius and maximums from 31-35 degrees Celsius.

• Northeast: Scattered thundershowers and isolated heavy rains are forecasted for Loei, Nong Bua Lamphu, Udon Thani, Bueng Kan, Sakon Nakhon, Nakhon Phanom, Chaiyaphum, Khon Kaen, Maha Sarakham, Mukdahan, Nakhon Ratchasima, and Ubon Ratchathani, with minimum temperatures between 23-25 degrees Celsius and maximums of 31-35 degrees Celsius.

• Central Thailand: Scattered thundershowers and isolated heavy rains are likely in Nakhon Sawan, Uthai Thani, Chainat, Lopburi, Saraburi, Ayutthaya, Kanchanaburi, Suphanburi, and Ratchaburi, with minimums of 24-26 degrees Celsius and maximums of 31-35 degrees Celsius.

• Eastern Thailand: Scattered thundershowers and isolated heavy rains are expected in Nakhon Nayok, Prachin Buri, Chachoengsao, Chonburi, Rayong, and Chanthaburi, with minimum temperatures between 24-27 degrees Celsius and maximums from 32-35 degrees Celsius; wave heights are anticipated at about one meter and above two meters during thunderstorms.

• Southern Thailand (East Coast): Scattered thundershowers and isolated heavy rains are forecast for Phetchaburi, Prachuap Khiri Khan, Chumphon, and Surat Thani, with minimum temperatures of 24-26 degrees Celsius and maximum temperatures between 30-35 degrees Celsius; waves could reach about one meter and over two meters in thundershowers.

• Southern Thailand (West Coast): Scattered thundershowers and isolated heavy rains are also expected in Phang Nga, Phuket, Krabi, Trang, and Satun, with temperatures ranging from 24-26 degrees Celsius for minimums and maximums of 32-35 degrees Celsius; waves will similarly reach heights of 1-2 meters or exceed two meters during thunderstorms.

• Bangkok Metropolitan Area: Scattered thundershowers and isolated heavy rains are expected, with minimum temperatures projected at 24-26 degrees Celsius and maximums reaching 32-34 degrees Celsius.