According to forecasts from the meteorological agency, in the last days of 2025 and early 2026, many northern mountainous provinces will be affected by increased cold air and continental high pressure, causing the weather to turn rainy and cold, with severe cold and harmful cold in some places.
Cao Bang: Cold rain, severe cold in some places from the beginning of the new year
Around January 1, 2026, the cold air mass will affect the weather in Cao Bang province.
Due to the impact of this cold air wave, on the night of December 31, 2025 and January 1, 2026, the weather in the province will be cloudy, with rain and light rain in many places.
From the night of January 1st, the weather will turn very cold, with severe cold in some places, Northeast wind level 2-3. The lowest temperature is commonly from 9-11°C. Prolonged light rain combined with low temperatures can cause a feeling of freezing cold, affecting outdoor activities and travel during the holidays.
Lang Son: Cold and humid, thick fog in the early morning
In Lang Son, on December 31, 2025, cold air tends to weaken, and stronger southeast winds cause humid and cold weather.
Fog appears at night and early morning, reducing visibility.
Temperatures range from 15-22°C, especially Mau Son area at 11-13°C; common humidity 72-80%.
People are advised to slow down, keep a safe distance when participating in traffic in foggy conditions; turn on lights near or fog lights, and keep their bodies warm, especially in the evening and early morning.
Lao Cai: Widespread severe cold and frost in the highlands
According to Lao Cai Hydrometeorological Station, from December 29-31, the area affected by continental high pressure will weaken; on January 1, continental high pressure will be strengthened again.
On December 29-31, it will be cloudy, with rain in some places, sunny in the afternoon; cold weather, the highlands will be severely cold at night and in the morning.
From January 1st, rain and light rain will appear scattered at night and in the morning, it will be cold, with days of severe cold; high-lying areas will be severely cold, high mountainous areas will be severely cold with the lowest temperature in some places only 5-7°C.
The meteorological agency warns that severe cold and frost are likely to occur throughout the province, people need to proactively take measures to prevent cold, protect health and agricultural production.
Son La: Risk of frost and frost at the beginning of the year
In Son La, during the 2026 New Year holiday (from January 1st to 4th), the weather is affected by increased continental cold high pressure.
On January 1st alone, combined with the strong West wind upwind, the temperature dropped deeply, severe cold and harmful cold occurred on a large scale.
On January 1st, the whole province will be cloudy, with rain and scattered showers; high mountainous areas will be severely cold and harmful.
From January 3-4, severe cold and frost tend to increase, high mountainous areas such as Moc Chau, Van Ho, Bac Yen are at risk of frost and frost. The lowest temperature is commonly 5-8°C, in some places down to about 5°C.
The meteorological sector recommends that rain and severe cold and frost can cause slipperiness, reduce visibility when participating in traffic, and at the same time affect people's health, especially the elderly, young children and agricultural production activities.
People and tourists need to proactively plan to ensure safety and maintain health during the first holiday of the year.
