In recent days, many provinces in the North have recorded light rains, drizzle and the phenomenon of unseasonal mucus. The heavy rain all day, the humidity in the air is always high.
According to Dr. Truong Ba Kien - Deputy Director of the Center for Meteorological and Climate Research, Institute of Meteorology, Hydrology and Climate Change, the cause of the moderate to moderate rain in recent days is due to a number of combined factors.
"The temperature in the North has decreased, although not directly affected, but indirectly affected by Typhoon Fung-Wong. This storm reached super typhoon level (16 - 17.) and made landfall in the northern Philippines with a very wide circulation. The northern quarter corner of the storm's circulation has helped increase the easterly and southeasterly winds blowing into the Gulf of Tonkin, bringing moisture to the mainland. When encountering cold temperatures, the humidity is strongly concentrated, creating a state of prolonged moisture in the Northern Delta and midland provinces" - Mr. Kien analyzed.
Dr. Truong Ba Kien also said that in the coming days, when storm No. 14 Fung-Wong moves north at the same time, a cold front will flow in, causing the weather to turn dry again.
According to the National Center for Hydro-Meteorological Forecasting, the Northern region will have scattered showers and thunderstorms on the night of November 10 and the day of November 11. On the night of November 11 and November 12, the North will have rain in some places, sunny in the afternoon.
From about November 12 to 13, due to the impact of cold air, the North is likely to be cold at night and in the morning. Around November 17 - 18, a stronger northeast monsoon is likely to arrive, the North will turn cold.
Regarding temperature trends, according to the National Center for Hydro-Meteorological Forecasting, in November, the average temperature in most areas across the country will generally be about 0.5 degrees Celsius lower than the average of many years; in particular, the provinces from Nghe An to Hue will generally be 0.5 - 1 degree Celsius lower than the average of many years in the same period.
"Currently, atmospheric and ocean conditions reflect ENSO being in a La Nina state. This winter is forecast to start at the average time of many years but the intensity of the monsoon is stronger than the average of many years and the average temperature is lower than the winter of 2024" - Dr. Truong Ba Kien analyzed.
The meteorological agency also forecasts that in November 2025, cold air will continue to increase in frequency and intensity. The phenomenon of severe cold in the North is likely to appear from the second half of December (equivalent to the average of many years).
"It is noteworthy that the intensity of cold air may be stronger and longer, especially in the period from December 2025 to January 2026, when La Nina peaks. The number of cold air waves flooding into Vietnam may be higher, some of which are likely to cause severe cold in the North" - Mr. Kien said.
The meteorological researcher emphasized that due to the influence of La Nina, it is necessary to closely monitor unseasonal rain in the Central region.
"La Nina also increases the northeast monsoon, causing drizzle and moist fog in the North and North Central regions to appear early and persistently in the first half of the 2026 spring" - Mr. Kien said.
