According to the National Centre for Hydro-Meteorological Forecasting, El Niño–Southern Oscillation (ENSO) conditions are currently neutral and are expected to remain stable from April to June 2025. As a result, this year’s heat is unlikely to be as intense or long-lasting as last year.
Heatwaves are predicted in late April across the Northwest and the mountainous areas of the North-Central and Central-Central regions, with less intensity than during the same period in 2024. In the Central Highlands and southern regions, widespread heat waves may arrive later than usual, with fewer days above 35 degrees Celsius than last year.
Starting in May, heatwaves will likely strengthen across the northern and central regions. The average temperature nationwide from April to June will be lower than the long-term average, except for the Northwest, where it will be 0.5-1 degree Celsius higher than usual for the same phase.
The average temperature nationwide from April to June is forecast to be close to the long-term norm, except in the Northwest, where it will be 0.5-1 degree Celsius higher than average for the same period.
This summer, more rainfall across the country is expected.
Rainfall in northern localities is expected to reach 70-120mm in April, with some mountainous areas exceeding 150mm. The region may record 120-220mm in May and over 250mm in some mountainous regions, about 5-10 percent above the long-term average. In June, rainfall will likely total 150-250mm, while mountainous areas may receive 250-500mm, with some spots surpassing 500mm.
In the central region, May rainfall is expected to be 5-15 percent higher than the long-term average, ranging from 100-200mm, with some areas recording more. In April and June, amounts will be near average, generally not exceeding 150mm.
The Central Highlands and southern regions will see 60-100mm of rain in April. In May, totals are forecast to surpass the long-term average by 5-15 percent at 150-250mm. Many places may record 200-300mm in June, with some exceeding this range.
Storms or tropical depressions may hit the East Sea in the next three months but are less likely to affect Vietnam.
