The northwestern region, including upland areas like Sa Pa, is experiencing high temperatures due to the development of a western low-pressure heat system.
Starting Monday it will continue to push eastward, spreading extreme heat across the entire northern region and into the plains surrounding Hanoi.
Temperatures are forecast to climb to 35-37 C, and surpass 38 C in some areas, and these conditions are expected to last through the end of the week.
According to the American forecasting site AccuWeather, temperatures in Hanoi will hover between 26 and 38 C over the next week.
Mountainous areas above 1,500 meters, such as Sa Pa, will see slightly cooler temperatures of 17 to 30 C.
The central region has recorded widespread, intense heat over the past three days, exacerbated by the combined influence of a low-pressure system and dry foehn winds.
Early this week the swathe between Thanh Hoa and eastern Gia Lai will continue to endure punishing temperatures typically between 36 and 38 C, and above 39 C in some localized spots.
The hot weather here is accompanied by low humidity of 40-45%.
These conditions sharply increase the risk of forest fires, and forecasters expect this to persist until the end of the week.
In the south, a prolonged heatwave has already lasted many days and shows no signs of easing.
The maximum temperatures will generally reach 35-37 C, with even higher peaks in some places.
The Central Highlands, home to Da Lat, will also suffer hot, dry conditions with similar temperatures early in the week.
According to the National Center for Hydro-Meteorological Forecasting, heatwaves across the nation are expected to be more frequent and severe than the historical average in April.
Average temperatures are expected to be 1.5-2.5 C higher than usual in the north and along the north-central coast, and 0.5-1.5 C higher in the rest of the country.
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