According to the National Center for Hydrometeorological Forecasting, the Northern mountainous and midland areas have moderate rain, heavy rain and thunderstorms, with very heavy rain in some places. Rainfall ranges from 50-100mm, in some places over 200mm.
In addition, the Northern Delta and Thanh Hoa also have moderate rain and thunderstorms, with heavy rain in some places. Rainfall ranges from 20-40mm, in some places over 80mm. Thunderstorms in the North will continue for the next few days.
From August 23, heavy rain tends to decrease. From August 24 to 29, there will only be showers and thunderstorms in some places, with intermittent sunny days.
Meanwhile, Nghe An to Ninh Thuan is hot today, in some places it is extremely hot. The highest temperature is from 35-37 degrees Celsius, in some places it is above 37 degrees Celsius. Hot sun combined with low humidity makes the risk of fire and explosion very high.
The Central Highlands and the South are sunny during the day, with thunderstorms in the evening, watch out for hail and lightning.

Weather forecast on August 21 in 10 tourist cities of Vietnam:
Hanoi
Lowest temperature: 25-27 degrees Celsius.
Highest temperature: 32-34 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: 25-27 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: 32-35 degrees Celsius.
The day had scattered showers and thunderstorms, with strong winds. The night was clear, no rain.
Hue
Lowest temperature: 24-26 degrees Celsius.
Highest temperature: 34-37 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: 33-36 degrees Celsius.
Hot sunny day, high UV index. Cloudy night, no rain.
Nha Trang
Lowest temperature: 24 degrees Celsius.
Highest temperature: 30-34 degrees Celsius.
Cloudy day, hot sun, high UV index. Cloudy night, no rain.
Da Lat
Lowest temperature: 17-24 degrees Celsius.
Highest temperature: 26-30 degrees Celsius.
Days with showers and thunderstorms, high UV index. The night was clear, no rain.
Ho Chi Minh City
Lowest temperature: 24-27 degrees Celsius.
Highest temperature: 31-35 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.
Day and night there are scattered thunderstorms and strong winds.
Phu Quoc
Lowest temperature: 26-28 degrees Celsius.
Highest temperature: 29-31 degrees Celsius.
Day with showers and thunderstorms. At night there was scattered rain and strong winds.