According to the National Center for Hydro-Meteorological Forecasting, a low-pressure trough combined with an active cyclonic system is bringing widespread rainfall to the northern midland and mountainous regions, with amounts ranging from 30–70 mm.

Some locations may receive more than 150 mm.

In certain areas, rainfall could exceed 100 mm within a three-hour period.

Starting Thursday, the rain will extend across the entire northern region, with total rainfall expected to reach 70–150 mm.

In some areas, 24-hour rainfall may surpass 300 mm, and heavy downpours exceeding 150 mm in three hours are also possible.

The upcoming rain will bring an end to the current heat wave in the north.

On Tuesday, Hanoi recorded a high of 38 degrees Celsius, but according to forecasts from the American weather service AccuWeather, temperatures are expected to drop to 35 C on Wednesday and continue decreasing to between 26–31 C by Saturday.

The meteorological agency warns that the heavy rain may cause flooding in low-lying, urban, and industrial areas; flash floods in small rivers and streams; and landslides in mountainous and sloped terrain.

The north is currently experiencing an unusually wet summer. In June, there were 20 days of rainfall, eight and seven more than in 2024 and 2023, respectively.

Several locations have already recorded historic rainfall levels for June. Son La Province recorded 379 mm, exceeding its 1995 record by 11 mm; Thai Nguyen saw 994 mm, surpassing the 1979 record by about 6 mm; Lang Son recorded 442 mm, over 100 mm more than the 1978 record; and Bac Giang reached 562 mm, exceeding the 1986 record by more than 50 mm.

The persistent rain has caused flooding in Thai Nguyen, Bac Ninh, and Son La provinces, as well as landslides on major provincial and national highways.