Northern Vietnam is bracing for a heavy rainfall event from July 16 to 20, with widespread precipitation expected across the region. According to the National Center for Hydro-Meteorological Forecasting, provinces such as Dien Bien, Son La, Lai Chau, Lao Cai, Tuyen Quang, and Thai Nguyen could see rainfall totals between 100 to 200mm, with localized areas possibly exceeding 350mm.

On the morning of July 16, meteorological leaders reported that due to the influence of a low-pressure trough passing through Northern Vietnam, the mountainous and midland areas have already experienced heavy rains ranging from 30 to 60mm. Some locations recorded significantly higher amounts, such as Tua Sin Chai in Lai Chau with 191.6mm, Tua Thang in Dien Bien with 160.1mm, Hai Son in Quang Ninh with 156.6mm, and Quang Binh in Tuyen Quang with 114.4mm.

The forecast indicates that from the evening of July 16 through July 21, there is a high likelihood of flooding along the rivers in Northern Vietnam. The flood levels on small rivers are expected to reach warning levels 2 to 3, while the Thao, Lo, and upper reaches of the Thai Binh rivers may reach warning levels 1 to 2, with some areas exceeding level 2.

Authorities have warned of a high risk of flash floods and landslides in the mountainous and midland provinces over the next 2 to 3 days. Looking further ahead, meteorologists predict that in August, the total rainfall in the mountainous and midland areas of Northern Vietnam will be 5-15% lower than the average for the same period in previous years. However, rainfall in the lowland areas from Northern Vietnam to Lam Dong is expected to be 10-30% higher than the historical average, with some areas from Thanh Hoa to Hue potentially exceeding 30-60% more than average.

From August to October, the frequency of typhoons and tropical depressions affecting the East Sea and directly impacting Vietnam is expected to be lower than the historical average. Typically, about 6.8 storms occur in the East Sea, with approximately 2.7 making landfall. Additionally, the heat wave conditions are expected to persist and intensify in the Thanh Hoa to Hue region and the coastal areas of Central South Vietnam during August and September, with more days of extreme heat anticipated compared to historical averages and the same period in 2025.