The Meteorological Department forecasts increased rainfall in Thailand from 20 to 26 July, with heavy showers in some places, especially in the North, Upper Northeast, and western Central Thailand, warning flood-prone areas to be cautious of flash floods and forest runoff.
On 20 July 2026, the Meteorological Department reported that in the next 24 hours, rainfall will be light across Thailand due to the weak southwest monsoon covering the Andaman Sea, Thailand, and the Gulf of Thailand. The public is advised to be cautious of thunderstorms. Sea conditions in the upper Andaman Sea and upper Gulf of Thailand are moderate with waves 1-2 meters high, while the lower Andaman Sea has waves about 1 meter high. In areas experiencing thunderstorms, waves may exceed 2 meters. Mariners are urged to navigate carefully and avoid sailing in areas with thunderstorms.
The 7-day weather forecast from 20 to 26 July 2026 indicates increased rainfall with heavy showers in some areas, particularly in the North, Upper Northeast, and western Central Thailand. This is due to a low-pressure area over Laos and northern Vietnam combined with a strengthening southwest monsoon covering the Andaman Sea, Thailand, and the Gulf of Thailand. Sea conditions remain moderate, with waves about 2 meters high in the upper Andaman Sea and over 2 meters in thunderstorm areas. The lower Andaman Sea and upper Gulf of Thailand will have waves 1-2 meters high, rising above 2 meters near thunderstorms.
The public, especially in the North and western Central Thailand, is urged to be cautious of heavy and accumulated rainfall, which may cause flash floods, forest runoff, and river overflows, particularly in foothill areas near waterways and low-lying zones.
Weather forecast for Thailand from 12:00 today until 12:00 tomorrow.
Northern region Thunderstorms are expected in 40% of the area, mainly in Mae Hong Son, Chiang Mai, Chiang Rai, Phayao, Nan, and Tak provinces. Minimum temperatures range from 22 to 27 degrees Celsius, maximum temperatures from 28 to 36 degrees Celsius. Winds are southwest at 10-20 km/h.
Northeastern region Thunderstorms are expected in 20% of the area, mainly in Loei, Nong Khai, Bueng Kan, Sakon Nakhon, Nakhon Phanom, and Ubon Ratchathani provinces. Minimum temperatures range from 23 to 25 degrees Celsius, maximum temperatures from 34 to 37 degrees Celsius. Winds are southwest at 10-20 km/h.
Central region Thunderstorms are expected in 10% of the area, mainly in Uthai Thani, Kanchanaburi, Ratchaburi, Nakhon Pathom, Lopburi, and Saraburi provinces. Minimum temperatures range from 23 to 26 degrees Celsius, maximum temperatures from 35 to 37 degrees Celsius. Winds are southwest at 10-20 km/h.
Eastern region Thunderstorms are expected in 20% of the area, mainly in Nakhon Nayok, Rayong, Chanthaburi, and Trat provinces. Minimum temperatures range from 25 to 28 degrees Celsius, maximum temperatures from 33 to 37 degrees Celsius. Winds are southwest at 15-35 km/h. Seas have waves 1-2 meters high, rising above 2 meters near thunderstorms.
Southern region (East coast) Thunderstorms are expected in 30% of the area, mainly in Nakhon Si Thammarat, Phatthalung, Songkhla, Pattani, Yala, and Narathiwat provinces. Minimum temperatures range from 23 to 26 degrees Celsius, maximum temperatures from 34 to 36 degrees Celsius. Winds are southwest at 15-30 km/h. Seas have waves about 1 meter high near shore, rising above 2 meters near thunderstorms.
Southern region (West coast) Thunderstorms are expected in 20% of the area, mainly in Phuket, Krabi, Trang, and Satun provinces. Minimum temperatures range from 23 to 25 degrees Celsius, maximum temperatures from 32 to 35 degrees Celsius. From Phang Nga northwards, winds are southwest at 15-35 km/h with seas having waves 1-2 meters high, rising above 2 meters near thunderstorms. From Phuket southwards, winds are southwest at 15-30 km/h with seas about 1 meter high, rising above 2 meters near thunderstorms.
Bangkok and metropolitan area Thunderstorms are expected in 10% of the area, mostly from afternoon to evening. Minimum temperatures range from 26 to 28 degrees Celsius, maximum temperatures from 35 to 37 degrees Celsius. Winds are southwest at 10-20 km/h.