A strong cold front is expected to sweep through Northern Vietnam, significantly lowering temperatures by 8-10 degrees Celsius. According to the National Center for Hydro-Meteorological Forecasting, this cold front will impact the region from the evening of October 4 into the early hours of October 5, resulting in rain and thunderstorms.

During this period, the northern provinces will experience moderate to heavy rainfall, particularly in the eastern part of the region, where the temperature drop will be most pronounced. On the night of October 4 and the morning of October 5, temperatures are expected to fall to around 21-22 degrees Celsius, with daytime highs reaching only 27 degrees Celsius.

In Hanoi, the temperature on October 4 is anticipated to be between 22 and 27 degrees Celsius. Following this cold front, from October 5 to 6, residents can expect chilly nights and mornings, especially in mountainous areas where it may feel quite cold.

The cold front will also affect weather conditions in Central Vietnam, with forecasts indicating scattered rain and thunderstorms from October 4 to 6 in the Thanh Hoa to Quang Tri region. The weather in Hue and the coastal areas of Central Vietnam will continue to see similar conditions, with localized heavy rain expected from October 6 to 10.

AccuWeather predicts that temperatures in Hanoi will decrease by 5-6 degrees Celsius during this cold spell, with highs around 28-29 degrees Celsius and lows between 22-23 degrees Celsius. Overall, the average temperature across the country in October is expected to be higher than the long-term average by 0.5 to 1.5 degrees Celsius, with some areas experiencing even greater increases.

While the average rainfall in the northern mountainous region is projected to be 5-20% above the long-term average, other areas of Northern Vietnam and from Thanh Hoa to Hue may see rainfall amounts 20-40% below average. Coastal areas of Central Vietnam, the Central Highlands, and Southern Vietnam are also expected to have rainfall below the long-term averages by 5-20%.

Despite the lower likelihood of typhoons and tropical depressions in the East Sea this October, meteorological authorities caution that these weather phenomena cannot be completely ruled out, as historically, about 2 storms or tropical depressions occur in the region each October, with approximately 0.8 making landfall in Vietnam.