The heat index (HI) in Vietnam’s five provinces and cities, including Hanoi, has reached dangerous levels during July 26 and in the next few days, according to the National Center for Hydro-Meteorological Forecasting (NCHFM).

The capital city and some provinces and cities, including Quang Ninh, Ha Tinh, Da Nang and Binh Dinh, has been experiencing a maximum HI up to between 41-54 degrees Celsius (hazardous levels), the NCHFM said.

People exposed to this high temperature for a long time or engage in physical activity may suffer heatstroke, cramps, and heat exhaustion.

A motorbike driver is covered up to avoid direct sunlight. Photo: Quy Doan

In recent days, the northern and central regions of Vietnam have experienced extremely hot weather. The highest temperature is generally 35-38 degrees Celsius, and in some places, it exceeds 39 degrees Celsius. The lowest relative humidity is generally 50-65%. The time the temperature exceeds 35 degrees Celsius is 10 to 17 hours.

In order to avoid heat shock, experts recommend that people apply sunscreen and wear blackout glasses when going out; arrange outdoor work and rest time reasonably to avoid direct sunlight and prolonged exposure; drink plenty of water and avoid working outdoors in hot weather; strengthen physical exercise and increase the ability to adapt to bad weather.

On July 26, the UV index in all cities across the country was at a very high risk of harm, which may cause damage to human skin, eyes, and immunity. Among them, Hanoi's UV index is 8.4, which is deemed extreme with radiation that could burn skin and damage eyes within 30 minutes to one hour.

Weather experts have advised local residents to avoid direct exposure to sunlight between 10:00 am and 3:00 pm and to wear sunscreens, sunglasses, and brimmed hats if they have to go out under the sun.

The capital city and other northern provinces could experience temperatures as high as 38 degrees Celsius until July 29, according to the NCHFM.

The center forecast the UV index in Hanoi would drop to moderate levels on July 30, thanks to a couple of thunderstorms.

Hanoi has braced itself as the temperature reached up to 35-38 degrees Celsius this week and is expected to remain as such during the weekend, the center said, adding that temperatures can reach 39-40 degrees Celsius on July 31.

Weather experts have warned that Hanoi should brace itself for more heatwaves set to sweep through the city this summer.