Vietnam’s National Centre for Hydro-Meteorological Forecasting said a cold air mass would begin affecting northern Vietnam from the evening of June 8.
Northern Vietnam to see heavy rain from the evening of June 8 (Photo: Nguyen Hai).
Although June marks the start of summer, cold fronts have occasionally reached northern Vietnam during the month. Meteorological data show that between 1979 and 2025, the country experienced 25 June cold fronts, averaging 0.53 events per year.
Since 1991, however, the frequency has declined significantly. Only seven June cold fronts were recorded over the past 35 years, equivalent to an average of 0.2 events annually.
Notably, no June cold front affected northern Vietnam between 2014 and 2025.
Meteorologists said the decline is consistent with broader climate change trends, as rising global temperatures have reduced the frequency of cold-air outbreaks reaching the region during the summer months.
According to the forecast, the cold air mass will first affect northern mountainous areas on the evening of June 8 before spreading across the Northeast, parts of the Northwest and the North Central region.
From the evening of June 8 through June 9, northern Vietnam is expected to experience widespread moderate to heavy rainfall.
The Northwest region, along with northern parts of Phu Tho Province and Tuyen Quang Province, is forecast to receive heavy to very heavy rain and thunderstorms, with rainfall totals of 80-160mm and isolated areas exceeding 250mm.
Thanh Hoa Province and Nghe An Province are expected to see moderate to heavy rain and thunderstorms, with rainfall ranging from 50-100mm and isolated totals above 150mm.
Other parts of northern Vietnam are forecast to receive 20-50mm of rainfall, with some locations recording more than 100mm.
The weather agency warned of rainfall intensities exceeding 100mm within three hours and cautioned residents about the risk of tornadoes, strong winds and hail during thunderstorms.
Authorities also warned of flash floods and landslides in the Northwest region and in northern areas of Phu Tho Province and Tuyen Quang Province.
Under the influence of the cold air mass and rainfall, daytime temperatures in the Northeast and Thanh Hoa Province are expected to fall by five to seven degrees Celsius on June 9. Maximum temperatures are forecast to remain below 31 degrees Celsius, while conditions will turn noticeably cooler from the night of June 8.
Minimum temperatures during the cold spell are expected to range between 22 and 25 degrees Celsius across the Northeast and Thanh Hoa Province, while some mountainous areas could see temperatures fall below 21 degrees Celsius.
In Hanoi, forecasters predict moderate to heavy rain and thunderstorms from the evening of June 8 through the morning of June 9, with some areas experiencing very heavy rainfall. Cooler weather is expected from the night of June 8, with minimum temperatures ranging from 23 to 25 degrees Celsius.
For central Vietnam, meteorologists said the ongoing heatwave would begin to weaken from June 9, becoming largely confined to areas from Hue southward to the eastern part of Dak Lak Province. By June 10, the prolonged spell of extreme heat across central Vietnam is expected to largely come to an end.
