The plains and the midlands of the north saw reduced temperatures on Monday, with Hanoi recording a maximum temperature of 29 degrees Celsius, a 3-4 degree drop from Sunday.
Starting Monday afternoon, moderate rain will be seen in northern Vietnam, with rain levels going up to 70 mm a day.
Extreme weather patterns like gusts, thunder and hail can also be observed, which may affect agriculture production and damage infrastructure.
U.S. weather forecast service AccuWeather anticipates Hanoi's temperatures to fall to 19-26 degrees, before gradually rising to a daytime temperature of 30 degrees on the weekend.
High-altitude areas like Lao Cai's Sa Pa will see their lowest temperatures at 14-18 degrees on Wednesday.
Central Vietnam regions also saw maximum temperatures drop by 2-3 degrees from Sunday to 35-36 degrees. Starting Tuesday morning, when the cold front arrives, areas from Thanh Hoa to Thua Thien-Hue will cool and see rain levels between 10-30 mm over 24 hours.
Southern Vietnam and Central Highlands regions will not be affected by the cold front, and continue to see sunny days, with the highest temperatures in the Central Highlands at 33-35 degrees, and at 35-37 degrees in southern Vietnam.
Northern Vietnam has been seeing high temperatures over the past week due to the Foehn effect and the impacts of a low-pressure area from the west. The highest temperature in Son La on April 22 was recorded at 41 degrees.
Weather experts say Vietnam’s temperatures for the next month will be 0.5-1.5 degrees higher than the average temperatures seen for several years.
Northern and central Vietnam will also see harsher sunlight and less rain due to the effects of El Nino.