According to the National Center for Hydro-Meteorological Forecasting, from the evening of August 30 to the evening of August 31, the Northern region will have moderate rain and thunderstorms, locally heavy to very heavy rain with rainfall of 20-40mm, locally over 80mm (rain concentrated at night and morning).
The North, South Central and South regions will have scattered showers and thunderstorms, locally heavy rain with rainfall from 10-30mm, locally over 60mm (rain concentrated in the evening and at night). Thunderstorms are likely to cause tornadoes, lightning, hail and strong gusts of wind.
From the evening of August 30 to the evening of September 1, in the Central Highlands, there will be moderate rain, heavy rain and thunderstorms, locally very heavy rain with common rainfall from 40-100mm, locally over 150mm (rain concentrated in the late afternoon and evening).
Warning: From the evening of September 1 to the evening of September 2, in the Central Highlands, there will be moderate rain, heavy rain, and locally very heavy rain with common rainfall of 20-50mm, and in some places over 80mm.
On August 31, the Central Central region will experience heat waves with the highest temperature commonly ranging from 35-36 degrees Celsius; the lowest relative humidity commonly ranging from 55-60%. From September 1, the heat waves will end in the Central Central region. According to the Southern Hydrometeorological Station, the low pressure trough with an axis at about 14-16 degrees North latitude, passing through the Central region, is active and causing rain.

Weather forecast for August 31 in 10 tourist cities of Vietnam:
Hanoi
Lowest temperature: 25-26 degrees Celsius.
Highest temperature: 32-35 degrees Celsius.
Hot and sunny during the day with some rain. Scattered showers and thunderstorms at night with strong gusts of wind.
Ha Long
Lowest temperature: 25-26 degrees Celsius.
Highest temperature: 32-33 degrees Celsius.
Hot and cloudy day. Scattered showers at night.
Ninh Binh
Lowest temperature: 25 degrees C.
Highest temperature: 32-34 degrees C.
Hot and sunny during the day with scattered thunderstorms. Scattered rain and strong winds at night.
Hue
Lowest temperature: 24-25 degrees Celsius.
Highest temperature: 33-36 degrees Celsius.
Hot and sunny day, thunderstorms in some places, high UV index. Partly cloudy night, no rain.
Danang
Lowest temperature: 25-26 degrees Celsius.
Highest temperature: 33-35 degrees Celsius.
Partly sunny day, occasional showers, high UV index. Showers at night.
Nha Trang
Lowest temperature: 24-25 degrees Celsius.
Highest temperature: 30-34 degrees Celsius.
Hot and sunny during the day, thunderstorms in some areas. Partly cloudy at night, no rain.
Dalat
Lowest temperature: 18-24 degrees C.
Highest temperature: 23-30 degrees C.
Day and night with showers and thunderstorms, strong winds.
Ho Chi Minh City
Lowest temperature: 24-25 degrees C.
Highest temperature: 30-31 degrees C.
Day and night with scattered showers and thunderstorms, strong gusts of wind.
Vung Tau
Lowest temperature: 24-25 degrees Celsius.
Highest temperature: 29-31 degrees Celsius.
Thunderstorms and strong winds during the day. Rain gradually decreases at night.
Phu Quoc
Lowest temperature: 25-28 degrees C.
Highest temperature: 29-32 degrees C.
Day and night with scattered showers and thunderstorms, strong gusts of wind.