According to the National Center for Hydro-Meteorological Forecasting, during the day and night of September 2, in the Northeast region, Thanh Hoa and the area from Da Nang to Binh Thuan, there will be scattered showers and thunderstorms, locally heavy rain with rainfall from 15-30mm, locally over 50mm (rain concentrated in the evening and at night). During thunderstorms, there is a possibility of tornadoes, lightning and strong gusts of wind.
The Central Highlands and the South have moderate rain, heavy rain and thunderstorms, some places have very heavy rain. Rainfall is generally from 40-80mm, some places have over 120mm (rain is concentrated in the afternoon and evening).
From early morning of September 4 to early morning of September 5, the Central Highlands and the South will have moderate to heavy rain, with some places experiencing very heavy rain with common rainfall of 20-40mm, and some places experiencing over 60mm (rain concentrated in the afternoon and at night). Heavy rain in the Central Highlands and the South is likely to continue.
This weather greatly affects the tourism and entertainment activities of local people and tourists on National Day, September 2. Heavy rain can cause landslides and flash floods in mountainous areas, midlands, riverbanks, streams, and flooding in plains and urban areas. Therefore, tourists need to be prepared with all necessary items and arrange a reasonable and safe tour schedule.

Weather forecast for September 2 in 10 tourist cities of Vietnam:
Hanoi
Lowest temperature: 25 degrees C.
Highest temperature: 32-34 degrees C.
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 degrees C.
Highest temperature: 32-33 degrees C.
Hot and cloudy day with some rain. Scattered showers at night.
Ninh Binh
Lowest temperature: 14-25 degrees C.
Highest temperature: 32-33 degrees C.
Day and night with scattered rain and strong winds.
Hue
Lowest temperature: 24-25 degrees Celsius.
Highest temperature: 33-34 degrees Celsius.
During the day there will be scattered thunderstorms and high UV index. At night the sky will be clear.
Danang
Lowest temperature: 25-26 degrees Celsius.
Highest temperature: 33-34 degrees Celsius.
Day and night with scattered showers and thunderstorms, strong gusts of wind.
Nha Trang
Lowest temperature: 24-25 degrees C.
Highest temperature: 29-32 degrees C.
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: 24-29 degrees C.
During the day there will be showers and thunderstorms, strong winds. At night there will be low clouds, no rain.
Ho Chi Minh City
Lowest temperature: 24-25 degrees Celsius.
Highest temperature: 31 degrees Celsius.
Day and night with scattered showers and thunderstorms, strong gusts of wind.
Vung Tau
Lowest temperature: 24-26 degrees Celsius.
Highest temperature: 29-31 degrees Celsius.
Thunderstorms and strong winds during the day. Rain gradually decreases at night.
Phu Quoc
Lowest temperature: 25-26 degrees Celsius.
Highest temperature: 29 degrees Celsius.
Day and night with scattered showers and thunderstorms, strong gusts of wind.