This morning, Bangkok and its metropolitan area experience scattered rain, while the Northeast leads in the arrival of a new cold wave, with temperatures dropping by 1-2 degrees Celsius.
21 Jan 2026 GMT+7 Meteorological Department The 24-hour weather forecast indicates that a new moderate high-pressure cold air mass from China has spread over southern China and northern Vietnam. It is expected to move over the Northeast region today and subsequently cover upper Thailand.
This causes the Northeast to have cool to cold weather with strong winds, and temperatures dropping by 1–2 degrees Celsius. The North, Central, and Eastern regions experience cool weather with morning fog, with some areas in the North having dense fog.
For the lower Central and Eastern regions, there is light rain in some places due to easterly winds. The public is advised to take care of their health due to changing weather conditions and to be cautious when traveling through foggy areas, as well as to be alert to fire hazards because of dry conditions.
In the South, there are isolated thunderstorms caused by a strengthening weak northeast monsoon covering the Gulf of Thailand and the southern region. Waves in the lower Gulf of Thailand reach about 2 meters high, with waves exceeding 2 meters in areas of thunderstorms. Fishermen are advised to exercise caution when navigating.
At present, upper Thailand is experiencing moderate to fairly high levels of dust and haze accumulation due to weak air ventilation conditions.
Weather forecast for Thailand from 06:00 today (20 Jan) to 06:00 tomorrow (21 Jan).
Northern Region Cool to cold weather with morning fog and some dense fog areas. Minimum temperatures range from 13-18°C, maximum temperatures from 29-35°C. Mountain peaks are cold to very cold with some frost, minimum temperatures between 2-10°C. Northwest winds blow at 10-15 km/h.
Northeastern Region Cool to cold weather with morning fog and strong winds. Temperatures will drop by 1–2°C. Minimum temperatures range 14-20°C, maximum 31-35°C. Mountain peaks are cold with minimum temperatures 9-14°C. Northeast winds blow at 10-30 km/h.
Central Region Cool weather with morning fog and isolated light rain in the lower part of the region. Minimum temperatures 18-23°C, maximum 33-35°C. Easterly winds at 10-20 km/h.
Eastern Region Cool weather with morning fog and 10% chance of thunderstorms, mainly in Chonburi, Rayong, Chanthaburi, and Trat provinces. Minimum temperatures 22-25°C, maximum 30-35°C. Northeast winds at 15-35 km/h. The sea has waves about 1 meter high near shore, 1-2 meters offshore, and over 2 meters in thunderstorm areas.
Southern Region (East Coast) Isolated thunderstorms affect about 10% of the area, mainly in Prachuap Khiri Khan, Chumphon, Surat Thani, and Nakhon Si Thammarat provinces. Minimum temperatures 21-24°C, maximum 31-34°C. From Surat Thani northwards, northeast winds at 15–35 km/h.
The sea has waves 1-2 meters high, with waves over 2 meters in thunderstorm areas. From Nakhon Si Thammarat southwards, northeast winds at 20–35 km/h with waves about 2 meters high, and over 2 meters in thunderstorm areas.
Southern Region (West Coast) Isolated thunderstorms affect about 10% of the area, mainly in Ranong, Phang Nga, Phuket, and Krabi provinces. Minimum temperatures 21-24°C, maximum 32-34°C. Northeast winds at 15-35 km/h. The sea has waves about 1 meter high near shore, 1-2 meters offshore, and over 2 meters in thunderstorm areas.
Bangkok and Metropolitan Area Morning fog with scattered light rain in some places. Minimum temperatures 23-25°C, maximum 32-34°C. Easterly winds at 10-20 km/h.