According to the National Center for Hydro-Meteorological Forecasting, the Northern region and Thanh Hoa have scattered showers and thunderstorms, locally with heavy rain with rainfall from 15-30mm, locally with over 70mm.
From the night of August 20 to 22, the Northern mountainous and midland areas are likely to experience a period of moderate rain, heavy rain and thunderstorms, with some places having very heavy rain. Total common rainfall is expected to be 50-100mm, with some places over 200mm.
Residents and tourists need to be aware of the risk of flooding in low-lying areas, flash floods and landslides in the northern mountainous areas. From August 23, heavy rain tends to decrease.
Meanwhile, the area from Nghe An to Ninh Thuan has hot weather, in some places it is extremely hot with the highest temperature commonly ranging from 35-37 degrees Celsius, in some places it is over 37 degrees Celsius; The lowest relative humidity is commonly 50-55%. The hot weather in the Central region is likely to last in the coming days.

Weather forecast on August 20 in 10 tourist cities of Vietnam:
Hanoi
Lowest temperature: 25-27 degrees Celsius.
Highest temperature: 32-35 degrees Celsius.
Day and night are cloudy, with moderate rain, heavy rain and scattered thunderstorms. During thunderstorms, there is a possibility of tornadoes, lightning and strong winds.
Ha Long
Lowest temperature: 25-28 degrees Celsius.
Highest temperature: 32-33 degrees Celsius.
Day and night there are scattered showers and thunderstorms, with strong winds.
Ninh Binh
Lowest temperature: 25-27 degrees Celsius.
Highest temperature: 32-36 degrees Celsius.
Cloudy days and nights, with a few thunderstorms and strong winds.
Hue
Lowest temperature: 24-26 degrees Celsius.
Highest temperature: 34-39 degrees Celsius.
On a day with thunderstorms in some areas, the UV index is high. Cloudy night, no rain.
Da Nang
Lowest temperature: 25-27 degrees Celsius.
Highest temperature: 33-37 degrees Celsius.
Hot sunny day, high UV index. Cloudy night, no rain.
Nha Trang
Lowest temperature: 24 degrees Celsius.
Highest temperature: 30-35 degrees Celsius.
Cloudy day, hot sun, high UV index. Cloudy night, no rain.
Da Lat
Lowest temperature: 18-24 degrees Celsius.
Highest temperature: 27-30 degrees Celsius.
The day will have showers and thunderstorms in some places. Cloudy night, no rain.
Ho Chi Minh City
Lowest temperature: 24-27 degrees Celsius.
Highest temperature: 31-36 degrees Celsius.
There will be thunderstorms in some places on the day and the UV index is high. Cloudy night, no rain.
Vung Tau
Lowest temperature: 24-27 degrees Celsius.
Highest temperature: 31-32 degrees Celsius.
Mild sunny day. At night there were scattered thunderstorms and strong winds.
Phu Quoc
Lowest temperature: 26-29 degrees Celsius.
Highest temperature: 29-32 degrees Celsius.
The day has scattered showers and thunderstorms. Cloudy night, no rain.