According to the National Center for Hydro-Meteorological Forecasting, after hot days, from the evening and night of July 28 to July 29, there was a new period of moderate to heavy rain in the Northern region.
The meteorological agency warns that during thunderstorms there is a possibility of thunderstorms, tornadoes, hail and strong winds; Mountainous and midland areas need to be careful of the possibility of flash floods and landslides.
Water levels downstream of rivers in the Northern Delta tend to change slowly and gradually decrease. On the upstream rivers and streams in the Northern region, there is a possibility of a flood from July 29 - 31, with flood amplitude on the rivers ranging from 2 - 3m. Tourists need to be careful of heavy rain, which can cause flash floods and landslides in mountainous areas; flooding in low-lying areas and urban areas.

Weather forecast on July 28 in 10 tourist cities of Vietnam:
Hanoi
Lowest temperature: 26 degrees Celsius.
Highest temperature: 32-33 degrees Celsius.
Cloudy day, cooling, some thunderstorms. There were scattered showers and thunderstorms at night, with strong winds.
Ha Long
Lowest temperature: 25-26 degrees Celsius.
Highest temperature: 31-33 degrees Celsius.
Thunderstorm day in some areas. Heavy rain at night, strong winds.
Ninh Binh
Lowest temperature: 26 degrees Celsius.
Highest temperature: 33-34 degrees Celsius.
Cloudy days and nights, with a few scattered thunderstorms.
Hue
Lowest temperature: 25-27 degrees Celsius.
Highest temperature: 35-36 degrees Celsius.
There were a few thunderstorms during the day and the UV index was high. Cloudy at night, with thunderstorms in some places.
Danang
Lowest temperature: 26-28 degrees Celsius.
Highest temperature: 34-35 degrees Celsius.
The day had a few thunderstorms and high UV index. The night was cloudy, it did not rain.
Nha Trang
Lowest temperature: 25 degrees Celsius.
Highest temperature: 30-33 degrees Celsius.
Hot sunny day, high UV index. Cloudy night, no rain.
Da Lat
Lowest temperature: 19-25 degrees Celsius.
Highest temperature: 23-30 degrees Celsius.
Hot sunny day, high UV index. Cloudy night, no rain.
Ho Chi Minh City
Lowest temperature: 24-26 degrees Celsius.
Highest temperature: 31 degrees Celsius.
Day and night there are scattered thunderstorms, accompanied by strong winds.
Vung Tau
Lowest temperature: 24-26 degrees Celsius.
Highest temperature: 30-31 degrees Celsius.
Cloudy day, thunderstorms, high UV index. At night there were scattered thunderstorms and strong winds.
Phu Quoc
Lowest temperature: 26 degrees Celsius.
Highest temperature: 29-31 degrees Celsius.
Cloudy day, showers and thunderstorms, high UV index. At night there was thunderstorms and strong winds.