According to experts from the National Center for Hydro-Meteorological Forecasting, the weak cold air mass will bring thunderstorms in the Northern region.
From the evening of May 28 to May 29, the weather in the North will have moderate rain, heavy rain and thunderstorms, locally very heavy rain with common rainfall from 30 - 90mm, locally over 180mm.
From early morning on May 29, cold air affected the North Central region, causing moderate rain, heavy rain and thunderstorms, locally very heavy rain. The common rainfall is 30 - 50mm, locally over 100mm. The rain in this area will be concentrated from the morning to the night of May 29.

According to the latest weather trend forecast from the National Center for Hydro-Meteorological Forecasting, from the afternoon of May 28 to May 29, the Central Highlands and the South will have moderate rain, heavy rain and scattered thunderstorms, locally very heavy rain.
Other areas will have scattered showers and thunderstorms, especially the area from Binh Dinh to Binh Thuan will have scattered showers and thunderstorms, locally heavy rain.
From the night of May 29, the Northwest and Northern Delta and North Central regions will have moderate rain, heavy rain and thunderstorms, locally very heavy rain; after that, the rain will decrease.
From around May 31, the weakening of cold air will cause local heat in these areas, the North Central region will have widespread heat in the North; the North from June 1 is likely to have widespread heat in the East.
The Central Central region will have showers and thunderstorms in some places in the evening and at night, sunny days, and from around May 31, there is a possibility of widespread hot weather.
The weather in the South Central, Central Highlands and South will have scattered showers and thunderstorms in some places, with scattered showers and thunderstorms in the afternoon and evening, with some places having heavy rain.
In the case of continuous rain due to cold air, people and tourists should bring umbrellas and raincoats when going out to prevent sudden changes in weather.
During thunderstorms, extreme weather phenomena such as lightning and strong gusts of wind may occur. Visitors should take shelter under large trees, electric poles or unsafe constructions, and not use metal umbrellas or phones when going out in thunderstorms.
Bring raincoats and anti-slip shoes: Prepare raincoats, umbrellas, boots or waterproof shoes if you plan to go out. Flooded roads can be slippery and dangerous.