According to the National Center for Hydro-Meteorological Forecasting, the North will have showers and thunderstorms in some places in the late afternoon and at night; sunny days, some places will be hot. The Central region will have showers and thunderstorms in some places in the late afternoon and at night, while the South will have scattered showers and thunderstorms in the late afternoon and at night, some places will have heavy rain; sunny days, some places will be hot.
The Central Central, Central Highlands and Southern regions have scattered showers and thunderstorms, with some places experiencing heavy to very heavy rain. The rainfall from 7pm on September 3 to 3am on September 4 was over 40mm in some places, such as: La Dee Commune (Quang Nam) 100.4mm, Dak To Lung (Kon Tum) 43.6mm...
It is forecasted that in the afternoon and evening of September 4, the Central Highlands and the South will have rain, moderate rain and scattered thunderstorms, locally heavy to very heavy rain with rainfall from 20-40mm, locally over 70mm.
The Central and South Central regions have scattered showers and thunderstorms, locally heavy rain with rainfall from 10-30mm, locally over 60mm. Thunderstorms are likely to cause tornadoes, lightning, hail and strong gusts of wind.
Meanwhile, storm No. 3 (Yagi) is continuously increasing in strength and is expected to make landfall in the sea east of Hainan Island with extremely strong winds, reaching level 14, gusting to level 17. After that, this storm will move straight into the Gulf of Tonkin, directly threatening the coastal provinces of the North and North Central regions.
With its current trajectory, storm No. 3 is likely to make landfall in the northern and north central provinces between September 7 and 8. From September 7, the northern region is likely to experience a period of very heavy rain. The total rainfall is extremely high, reaching 400 to 500 mm, including rain caused by the storm's circulation.

Weather forecast for September 4 in 10 tourist cities of Vietnam:
Hanoi
Lowest temperature: 25-27 degrees Celsius.
Highest temperature: 32-37 degrees Celsius.
Overcast day. Partly cloudy night, no rain.
Ha Long
Lowest temperature: 25-28 degrees Celsius.
Highest temperature: 32-34 degrees Celsius.
Hot and sunny day, cloudy with some rain. Night with few clouds and no rain.
Ninh Binh
Lowest temperature: 25-27 degrees Celsius.
Highest temperature: 32-37 degrees Celsius.
Cloudy day, no rain. Clear night with few clouds.
Hue
Lowest temperature: 22-25 degrees C.
Highest temperature: 32-37 degrees C.
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: 32-35 degrees Celsius.
Day and night with scattered showers and thunderstorms, strong gusts of wind.
Nha Trang
Lowest temperature: 24-26 degrees C.
Highest temperature: 29-34 degrees C.
Thunderstorms in some areas during the day, high UV index. Partly cloudy at night, no rain.
Dalat
Lowest temperature: 19-24 degrees C.
Highest temperature: 23-29 degrees C.
Day and night with showers and thunderstorms, strong winds.
Ho Chi Minh City
Lowest temperature: 24-26 degrees Celsius.
Highest temperature: 30-31 degrees Celsius.
During the day there will be scattered showers and thunderstorms, with strong gusts of wind. Rain will gradually decrease at night.
Vung Tau
Lowest temperature: 24-27 degrees C.
Highest temperature: 29-31 degrees C.
Day and night with thunderstorms and strong winds.
Phu Quoc
Lowest temperature: 25-27 degrees C.
Highest temperature: 29 degrees C.
Day and night with scattered showers and thunderstorms, strong gusts of wind.