Northern region is about to welcome cold air causing thunderstorms, cooling down
It is forecasted that around the night of September 30, the North will welcome cold air causing scattered showers and thunderstorms; the temperature will decrease from around October 1.
In the last days of September, the temperature in the Northern region is still high, with the highest temperature in some places above 35 degrees Celsius. Forecast from September 28 - 30, the Northern region and from Thanh Hoa to Hue will continue the weather situation with showers and thunderstorms in some places in the evening and at night; sunny during the day, hot in some places.
From around the night of September 30, the North is likely to welcome cold air causing scattered showers and thunderstorms. From around October 1, the temperature tends to decrease by about 3 - 4 degrees Celsius.

According to the 10-day temperature chart, Hanoi weather has a fairly clear change when the temperature has decreased since the beginning of October, showing signs of cooling as cold air is about to affect.
On September 28-29, the highest temperature will still be 35 degrees Celsius, the lowest will be 27-28 degrees Celsius, with little clouds and hot sunshine.
On September 30, the highest temperature will slightly decrease to 34 degrees Celsius, cloudy, no rain.
By October 1st, the temperature will drop more clearly, the highest is 31 degrees Celsius, the lowest is 25 degrees Celsius, cloudy and with moderate rain. On October 2nd, the temperature will fluctuate from 26 - 32 degrees Celsius, with thunderstorms.
From April 3 - October 10, the temperature will slightly increase again, highest 32 - 33 degrees C, but then continue to decrease. On July 5 - October 10, the highest temperature is commonly 31 degrees C, the lowest decreases from 25 degrees C to 24 degrees C, accompanied by showers and thunderstorms.
Thus, after the hot days of late September, Hanoi enters early October with a trend of cooling down, cloudy weather and rain appear more often when cold air begins to affect.
Meanwhile, rain in the Central and Southern regions tends to decrease compared to last week.
South Central Coast in the late afternoon and night has showers and thunderstorms in some places, sunny days; especially on the evening of September 27, there are scattered showers and thunderstorms, locally heavy rain.
Central Highlands and Southern regions in the afternoon and evening will have scattered showers and thunderstorms in some places; especially in the evening of September 27, there will be scattered showers and thunderstorms, locally heavy rain. In thunderstorms, there is a possibility of tornadoes, lightning, hail and strong gusts of wind.
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