On January 5, according to information from Lang Son Hydrometeorological Station, the weather in the province continued to maintain a cloudy pattern, sometimes with scattered light rain, temperature fluctuating from 10–16 degrees C, Northeast wind level 2-3, air humidity at 70–75%.
Especially in the high mountainous area of Mau Son, it is freezing cold, the temperature throughout the day is commonly from 4–10 degrees Celsius, strong Northeast wind level 4.
In Cao Bang, on January 5, the areas in the province will be cloudy, with light rain in some places at night and in the morning, severe cold weather, severe cold in many places, the lowest temperature is commonly from 8–14 degrees Celsius depending on the area, the highest from 12–17 degrees Celsius, Northeast wind level 2.
Forecast for the next 3 days, from January 6–8, 2026, the area will continue to be affected by cold air, prolonged severe cold and frost.
On January 6, cloudy, with light rain in some places, from January 7–8, cloudy at night and in the morning, no rain, intermittent sunshine during the day, the lowest temperature is commonly 9–11 degrees C, the highest is 14–16 degrees C.
Meanwhile, in Son La, from the afternoon of January 5, increased cold air began to affect the southeastern area of the province such as Moc Chau, Van Ho, Bac Yen, Yen Chau, then spread throughout the province, causing rain, scattered showers, the weather continued to be cold, with severe cold in some places, and severe cold in high mountainous areas.
From the night of January 6, due to clear skies and calm winds at night and early morning, areas such as To Hieu, Mai Son, Bac Yen, Moc Chau, Van Ho and some other high mountainous areas are warned of the possibility of frost and frost.
