The Meteorological Department forecasts temperatures by region for 6-10 Jan 2026. Thailand is preparing for a new cold air mass coming from China. The southern region will have increased rainfall. Health precautions are advised to the public due to the weather changes.
On 5 Jan 2026, the Meteorological Department reported that from 4 to 5 Jan 2026, upper Thailand will experience a temperature drop with strong winds. The northern and northeastern regions will be cold to very cold. The central region, including Bangkok and its vicinity, the eastern region, and the upper south will have cool mornings due to a high-pressure area or cold air mass spreading from China covering upper Thailand and the South China Sea.
The lower southern region has little rain because the moderate northeast monsoon covers the Gulf of Thailand, the south, and the Andaman Sea. Waves and winds in the Gulf of Thailand and Andaman Sea are moderate. In the lower Gulf, waves reach about 2 meters high, while the upper Gulf and offshore Andaman Sea have waves 1–2 meters high. Areas with thunderstorms have waves over 2 meters.
From 6 to 10 Jan 2026, upper Thailand will continue to experience cold to very cold weather with decreasing temperatures and strong winds. This is due to another relatively strong high-pressure or cold air mass from China reinforcing coverage over upper Thailand and the South China Sea.
The southern region will have increased rain with some heavy rainfall in the lower southern area. The moderate northeast monsoon covering the Gulf of Thailand, the south, and the Andaman Sea will strengthen. Winds and waves in the Gulf of Thailand and Andaman Sea will become stronger, with waves 2–3 meters high in the lower Gulf, and over 3 meters in areas with thunderstorms. The upper Gulf will have waves around 2 meters high, with over 2 meters in areas with thunderstorms.
Precautions: People in upper Thailand and the upper south should take care of their health due to the continued cold weather and be cautious of fire hazards because of dry conditions and strong winds. Mariners in the Gulf of Thailand and Andaman Sea should navigate carefully and avoid areas with thunderstorms throughout this period. Small boats in the lower Gulf of Thailand are advised to stay ashore from 6 to 9 Jan 2026.
Northern RegionCold to very cold mornings with temperatures dropping 2–4 degrees Celsius. Lowest temperatures range from 11 to 16 degrees Celsius, highest from 26 to 31 degrees Celsius. Mountain peaks will be cold to very cold with some frost in places; lowest temperature 2 to 12 degrees Celsius. Northeast winds blowing at 10–25 km/h.
Northeastern RegionFrom 4 to 5 Jan 2026, cold to very cold mornings with lowest temperatures of 14 to 17 degrees Celsius and highs of 28 to 31 degrees Celsius. From 6 to 10 Jan, cold to very cold weather continues with strong winds, temperatures dropping 4 to 6 degrees Celsius. Lowest temperatures 9 to 13 degrees Celsius, highest 25 to 28 degrees Celsius. Mountain peaks will be cold to very cold, with lows of 6 to 10 degrees Celsius. Northeast winds blowing at 15–35 km/h.
Central RegionFrom 4 to 5 Jan 2026, cool mornings with temperatures dropping 1 to 3 degrees Celsius. Lowest temperatures 15 to 20 degrees Celsius, highest 30 to 32 degrees Celsius. From 6 to 10 Jan, cold to very cold mornings with strong winds, temperatures dropping 2 to 4 degrees Celsius. Lowest temperatures 13 to 17 degrees Celsius, highest 28 to 30 degrees Celsius. Northeast winds at 10–30 km/h.
Eastern RegionFrom 4 to 5 Jan 2026, cool mornings with temperatures dropping 1 to 2 degrees Celsius. Lowest temperatures 17 to 22 degrees Celsius, highest 30 to 33 degrees Celsius. Northeast winds at 15–35 km/h. Seas have waves about 1 meter high near shore and 1–2 meters offshore. From 6 to 10 Jan, cold to very cold mornings with strong winds, temperatures dropping 2 to 4 degrees Celsius. Lowest temperatures 15 to 19 degrees Celsius, highest 28 to 31 degrees Celsius. Northeast winds 20–35 km/h. Seas have waves 1–2 meters high near shore and about 2 meters offshore.
Southern Region (East Coast)Cool mornings in the upper south throughout the period. From 4 to 5 Jan 2026, thunderstorms occur in 10–20% of the area, mostly in the lower south.
From Nakhon Si Thammarat province northward: northeast winds at 15–35 km/h, seas with waves 1–2 meters high, and about 2 meters high in areas with thunderstorms. From Songkhla province southward: northeast winds at 20–35 km/h, seas with waves about 2 meters high, and over 2 meters in areas with thunderstorms. From 6 to 10 Jan, thunderstorms will cover 30–40% of the area with some heavy rain in the lower south.
From Nakhon Si Thammarat northward: northeast winds 20–35 km/h, seas with waves about 2 meters high, and about 2 meters high in areas with thunderstorms. From Songkhla southward: northeast winds 20–40 km/h, seas with waves 2–3 meters high, and over 3 meters in areas with thunderstorms. Lowest temperatures 18 to 24 degrees Celsius, highest 28 to 33 degrees Celsius.
Southern Region (West Coast)From 4 to 5 Jan 2026, thunderstorms in 10–20% of the area. Northeast winds 15–35 km/h. Seas with waves about 1 meter high near shore and 1–2 meters offshore, with waves over 2 meters in areas with thunderstorms. From 6 to 10 Jan, thunderstorms in 20–40% of the area, mostly in the lower south. Northeast winds 15–35 km/h. Seas with waves 1–2 meters high near shore and over 2 meters offshore and in thunderstorm areas. Lowest temperatures 21 to 26 degrees Celsius, highest 31 to 34 degrees Celsius.
Bangkok and VicinityFrom 4 to 5 Jan 2026, cool mornings with temperatures dropping 1 to 2 degrees Celsius. Lowest temperatures 19 to 21 degrees Celsius, highest 29 to 32 degrees Celsius. From 6 to 10 Jan, cool mornings with strong winds and temperatures dropping 2 to 4 degrees Celsius. Lowest temperatures 17 to 18 degrees Celsius, highest 27 to 30 degrees Celsius. Northeast winds blowing at 10–30 km/h.