Before the cold front arrives, Hanoi will experience rain, moderate rain, and thunderstorms, with some areas experiencing heavy rain. The highest temperature on October 5th in the city center is forecast to be around 27 degrees Celsius.
According to the National Center for Meteorological and Hydrological Forecasting, the cold air mass in the North is continuing to move southward. Around late afternoon and night of October 4th, the cold air mass will begin to affect the Northeast region, then expand to other areas in the North and the area from Thanh Hoa to Hue city.
On land, winds will shift to the northeast at force 2-3, and force 3-4 in coastal areas. From the night of October 4th, the Northeast region and Thanh Hoa will experience colder weather, with some mountainous areas experiencing freezing temperatures. The lowest temperatures during this cold spell in the North and Thanh Hoa will generally be 19-22 degrees Celsius, and 14-17 degrees Celsius in mountainous areas.
In Hanoi, the weather will change significantly over the next two days. On October 3rd, the capital will be cloudy with sunny periods during the day, and hot in some areas; there will be occasional showers and thunderstorms at night. Winds will be from the Southeast to South at speeds of 2-3. The lowest temperature will be 24-26 degrees Celsius, and the highest 34-35 degrees Celsius.
From the night of October 4th to the morning of October 5th, Hanoi experienced rain, moderate rain, and thunderstorms, with some areas experiencing heavy rain. From early morning on October 5th, the weather turned cold.
According to the 10-day weather forecast data from the National Center for Hydro-Meteorological Forecasting in the Hoan Kiem area, on October 4th, the temperature will range from 26-32 degrees Celsius, with cloudy skies and moderate rain. On October 5th, the forecast temperature will range from 24-27 degrees Celsius, with continued cloudy skies and moderate rain.
Therefore, compared to the highest temperature of 34-35 degrees Celsius predicted in Hanoi on October 3rd, the highest temperature in the central area of the capital on October 5th may be about 7-8 degrees Celsius lower.
According to the Department of Meteorology and Hydrology, this is the first cold spell of the 2026-2027 winter season, appearing about 2-5 days earlier than the multi-year average. The cold air began affecting the Northeast region from the evening of October 4th, and then expanded its affected area.
Along with the decrease in temperature, thunderstorms will occur over a wide area. From October 4th to the morning of October 5th, Northern Vietnam will experience rain, moderate rain, and thunderstorms, with some areas experiencing heavy to very heavy rain. From the night of October 4th to October 6th, the area from Thanh Hoa to Hue City will have moderate rain and thunderstorms, with some areas experiencing heavy to very heavy rain.
The meteorological agency warns that thunderstorms are highly likely to bring tornadoes, lightning, hail, and strong gusts of wind. Localized heavy rainfall could cause flash floods on small rivers and streams, landslides on slopes, and flooding in low-lying areas.
At sea, around dawn and morning of October 5th, the Gulf of Tonkin experienced strong northeasterly winds, reaching force 6, sometimes force 7, with gusts of force 8-9; sea waves were 2-3 meters high, and the sea was rough.
From October 5th, the northern part of the South China Sea will experience strong northeasterly winds of force 6-7, gusting to force 8; sea waves will be 2-4 meters high, with rough seas. From October 6th, the strong wind area will expand to the entire northern South China Sea, including the Hoang Sa (Paracel) Islands.
The meteorological agency noted that thunderstorms accompanied by tornadoes, lightning, hail, and strong gusts of wind could cause trees to fall, damage houses, transportation infrastructure, and other facilities; and affect agricultural production. Strong winds and high waves at sea could affect the operation of ships and other activities.
Source: https://baotintuc.vn/khong-khi-lanh-tran-ve-ha-noi-giam-nhiet-tu-ngay-510-post1391079.html
