A monsoon in the northeast is expected to bring low temperatures and rain to the region later this week.
According to the National Center for Hydro-meteorological Forecasting, an enhanced cold front has formed north of Vietnam and is traveling south.
The mass of cool air is forecast to enter the northern part of the country on Thursday afternoon and later reach the center.
Under the influence of the monsoon, light rain is anticipated in northern provinces while average temperatures are expected to drop to between 10 and 12 degrees Celsius.
The mainland, including Hanoi, is forecast to experience temperatures from 13 to 15 degrees Celsius. Mountainous areas can expect brisk conditions with around eight to 11 degrees Celsius.
Local residents have been advised to carry out measures to protect their crops and cattle against the cold conditions.
The cold front will also cause rough seas near the Gulf of Tonkin and the northern part of the East Vietnam Sea with winds from 50 to 61 km per hour and waves from 2.5 to 3.5 meters high.
According to Le Dinh Quyet, deputy head of the Southern Meteorological Station, an unseasonal rain impacted several parts of Ho Chi Minh City on Sunday afternoon and later the southern province of Tay Ninh.
High temperatures of up to 35 degrees Celsius are expected in southern Vietnam over the next few days, Quyet said.
As a northeast wind reaches the region by the weekend, average temperatures will decrease by one to three degrees Celsius, while brisk weather is still expected at night, according to the expert.