The National Center for Hydro-Meteorological Forecasting has forecast the seasonal weather trend (from April to September 2026). Accordingly, during this period, there will be significant weather changes.
Regarding the temperature trend, from April to June, the average temperature nationwide is generally approximately equal to the multi-year average. Especially in the Northern region and provinces from Thanh Hoa to Nghe An in April, the average temperature is 0.5 - 1 degree Celsius higher than the multi-year average of the same period.
According to Mr. Nguyen Duc Hoa - Deputy Head of the Climate Forecasting Department, National Center for Hydro-Meteorological Forecasting, from April, cold air will operate with weak intensity and gradually decrease in frequency.
Cold air during the transitional season may cause thunderstorms in the North, with the risk of tornadoes, lightning, hail and strong gusts of wind in the Northern region" - Mr. Hoa advised.
Meanwhile, hot weather tends to increase in most areas across the country.
In April, the heat in the Southeast region continues to increase in intensity and expand to the Central Highlands and the Southwest region. By the end of May, the heat will decrease in intensity and gradually narrow in the above areas in June" - Mr. Hoa said.
The Deputy Head of the Climate Forecasting Department added that in the Northwest region and some western provinces from Thanh Hoa to Hue from about April, hot weather will increase. Then from about the end of May, hot weather will gradually expand throughout the North and Central regions, intensity increasing in the following months.
From July to September, the average temperature nationwide is generally 0.5 - 1 degree Celsius higher than the multi-year average, in some places higher.
In the Northern and Central regions from July to September, hot weather continues to tend to expand and increase in intensity. Hot weather is likely to occur more than the multi-year average and more intense than the same period in 2025" - Mr. Hoa assessed.
In the context of global temperatures still maintaining at record highs, according to warnings from the World Meteorological Organization, 2026 is likely to continue to be in the group of hottest years since the observation data was available.
According to the meteorological agency, when ENSO leans towards the hot phase from the second half of the year, monsoon winds in the Pacific Ocean tend to weaken, convection distribution changes, increasing the probability of prolonged and more extreme heat waves appearing in tropical areas, including Vietnam.
At the same time, rain in some Southeast Asian regions, especially in the south of our country at the end of the year, may be lower than the multi-year average.
From around September 2026, the heat will tend to gradually decrease but there may still be unusually late heat waves.
Overall, extreme heat is no longer a strange phenomenon but is becoming an increasingly clear characteristic in the context of climate change and ENSO shifting to a hot phase.
Seasonal weather forecasting information is trend forecasting in nature. The meteorological agency especially emphasized that in the context of climate change, weather, and climate are increasingly complicated with many dangerous and extreme forms such as heavy rain in a short time, flash floods, landslides...
Therefore, it is proposed to regularly update and integrate forecast information and hydrometeorological warnings in 1-3 day short-term bulletins, to promptly adjust production plans, appropriate response plans, especially appropriate reservoir operation plans, ensuring the safety of works and downstream areas, and at the same time ensuring safety for production and people's livelihoods.
