The Meteorological Department forecasts that between 21-25 January, Thailand will experience a new cold wave with temperatures dropping 2-4 degrees Celsius. Bangkok’s lowest temperature will be 21 degrees Celsius, while the southern region will continue to have scattered thunderstorms.
On 20 January 2026, reporters reported that the Meteorological Department's Facebook page forecasted a new cold wave from 21-25 January 2026, with temperatures dropping 2-4 degrees Celsius.
The 24-hour weather forecast indicates that upper Thailand will have cool weather with morning fog, including some areas of dense fog. The North and Upper Northeast will remain cool to cold due to a weakening high-pressure system or cold air mass covering upper Thailand. Meanwhile, westerly winds from Myanmar move over the Upper North and Upper Laos. The Lower Central and Eastern regions will experience some rain due to southeasterly winds bringing moisture. The public is advised to take care of their health amid changing weather, be cautious when traveling in foggy areas, and beware of fire hazards because of dry conditions.
For the South, scattered thunderstorms are expected as a weakening northeast monsoon covers the Gulf of Thailand and the South. Waves in the Gulf of Thailand and the Andaman Sea are about 1 meter high. Mariners are urged to exercise caution when navigating.
Currently, in upper Thailand, the accumulation of dust and haze is at moderate to rather high levels due to weak air ventilation.
Upper Thailand will see temperatures drop by 2 - 4 degrees Celsius, with cool to cold weather and strong winds, as a new moderate-strength high-pressure system or cold air mass from China moves over upper Thailand and the South China Sea. The South will continue experiencing scattered thunderstorms due to a moderate-strength northeast monsoon covering the Gulf of Thailand, the South, and the Andaman Sea. Winds in the Gulf of Thailand will strengthen, with waves about 2 meters high in the lower Gulf and over 2 meters in thunderstorm areas.
Northern Region From 20 – 25 January 2026, the North will experience cool to cold weather with morning fog and some areas of dense fog. Minimum temperatures will range from 12 – 19 degrees Celsius, maximum temperatures from 28 – 35 degrees Celsius. Mountain peaks will be cold to very cold with some frost, minimum temperatures between 2 - 10 degrees Celsius. Easterly winds blow at 10 - 15 km/h.
Northeastern Region From 21 – 25 January 2026, the Northeast will have cool to cold weather with strong winds and temperatures dropping 2 – 4 degrees Celsius. Minimum temperatures will range from 12 – 19 degrees Celsius, maximum temperatures from 28 - 32 degrees Celsius. Mountain peaks will be cold to very cold with minimum temperatures between 4 - 12 degrees Celsius. Northeasterly winds blow at 15 - 30 km/h.
Central Region From 22 – 25 January 2026, the Central region will have cool to cold weather with some morning fog. Temperatures will drop 1 – 3 degrees Celsius, with minimums between 14 – 22 degrees Celsius and maximums from 31 – 34 degrees Celsius. Northeasterly winds blow at 10 - 25 km/h.
Eastern Region From 21 – 25 January 2026, the East will have cool mornings with strong winds and temperatures dropping 2 – 4 degrees Celsius. Minimum temperatures will be 18 – 23 degrees Celsius, maximums 29 – 34 degrees Celsius. Northeasterly winds blow at 15 - 35 km/h. Sea waves will be about 1 meter high near shore and 1 - 2 meters further offshore.
Southern Region (East Coast) From 21 – 25 January 2026, from Surat Thani province northward, easterly winds blow at 15 – 35 km/h, with sea waves 1 - 2 meters high; in thunderstorm areas, waves exceed 2 meters. From Nakhon Si Thammarat province southward, easterly winds blow at 20 – 35 km/h, seas around 2 meters high, with waves over 2 meters in thunderstorm areas. Minimum temperatures range from 18 – 25 degrees Celsius, maximums from 30 – 35 degrees Celsius.
Southern Region (West Coast) From 21 – 25 January 2026, easterly winds blow at 15 - 35 km/h, with sea waves about 1 meter high near shore and 1 – 2 meters offshore. In thunderstorm areas, waves exceed 2 meters. Minimum temperatures range from 21 – 25 degrees Celsius, maximums from 32 – 35 degrees Celsius.
Bangkok and Vicinity From 22 – 25 January 2026, Bangkok and its vicinity will experience cool weather with some morning fog. Temperatures will drop 1 – 3 degrees Celsius, with minimums between 21 – 24 degrees Celsius and maximums from 31 – 33 degrees Celsius. Northeasterly winds blow at 10 - 25 km/h.