Areas across the country are entering the transitional season, the weather is about to change. The National Center for Hydro-Meteorological Forecasting has issued a nationwide seasonal hydro-metropoleum forecast bulletin (ie from April to September 2025).
Regarding the trend of temperature, the average heat background in April - June across the country is approximately common compared to the average for many years. Particularly in May, the average temperature in the Northwest region is 0.5 - 1 degrees Celsius higher than the average of the same period.
The average temperature from July to September is 0.5 - 1 degree Celsius higher than the average of many years in the same period.
According to Dr. Hoang Phuc Lam - Deputy Director of the National Center for Hydro-Meteorological Forecasting, from April, the activity will gradually decrease in intensity and frequency.
"There is a possibility of dangerous weather phenomena such as thunderstorms, tornadoes, lightning, hail and strong gusts of wind across the country; especially during cold air waves during the changing seasons, around April - May" - Mr. Lam said.
Previously, from January to now, there have been 8 cold air waves and 4 severe cold waves in the Northern region.
When the cold air weakens, the hot season also begins. According to the meteorological agency, widespread hot weather is likely to appear in the Central Highlands and the South from April, later than the average of many years with fewer hot days than the same period in 2024.
"In the Northwest and mountainous areas of the North Central and Central Central regions in April 2025, the intensity of hot weather will be less severe than in the same period in 2024. From May 2025, the heat is likely to increase in the entire Northern and Central regions" - Mr. Lam provided forecast information.
According to the Deputy Director of the Meteorological Agency, from July to August 2025, the hot weather in the Northern and Central regions is likely to continue and gradually decrease in September 2025.
Regarding the rainfall trend, in the Northern region, the total rainfall in April was approximately the same as the average of many years (average common from 70 - 120mm, mountainous areas over 150mm).
In May, total rainfall is generally 5 - 10% higher than the average of many years, in mountainous areas it is 5 - 15% lower (in mountainous areas, the common rainfall is from 120 - 220mm, in mountainous areas it is over 250mm).
In June, total rainfall was approximately the same as the average of many years in the same period (average commonly from 150 - 250mm, mountainous areas 250 - 500mm, some places over 500mm).
The Central region in April will have total rainfall approximately the same as the average of many years. In the North and Central Central regions, it is common to have 60 - 100mm, in some places it is higher, in the South Central region, it is common to have 20 - 40mm.
In May, total rainfall is generally 5 - 15% higher than the average of many years in the same period (average is generally from 100 - 200mm).
In June, total rainfall is approximately the same as the average of many years in the same period (average common 70 - 150mm)
The Central Highlands and the South will have total rainfall in April 5 - 10mm higher than the average of many years (average common 60 - 100mm, especially the Southern Central Highlands is common 100 - 180mm).
In May, total rainfall is generally 5 - 15% higher than the average of many years in the same period (average is generally from 150 - 250mm).
In June, total rainfall was approximately the same as the average of the same period (average common 200 - 300mm).
