From Monday to Wednesday, many areas in northern Vietnam would experience rain levels at 70-250 mm, according to the National Center for Hydro-Meteorological Forecasting.
People in the northern midlands and mountainous areas should be wary of flash floods and landslides, the center said.
The National Steering Committee for Natural Disaster Prevention has also requested northern localities to monitor rain situations and check for geologically vulnerable areas.
Starting Thursday however, the low-pressure area would weaken and temperatures would rise again in the north, at 35-37 degrees at the highest.
U.S. weather forecast service AccuWeather said Hanoi's temperatures would be at 26-32 degrees in the first half of this week, with daytime temperatures on the weekends at 38-39 degrees. High-altitude locations like Lao Cai’s Sa Pa would record daytime temperatures at 22-26 degrees, and 17-19 degrees at night.
In central Vietnam, areas from Thanh Hoa to Ha Tinh would see rain levels at 50-200 mm due to impacts of a low-pressure area until Wednesday, ending a string of hot sunny days. But starting Thursday, the heat is expected to return in the central areas, with daytime temperatures at 36-38 degrees.
In southern Vietnam and the Central Highlands, rains would make their appearance at dusk this week. The highest temperatures in the Central Highlands are at 28-32 degrees, and 31-34 degrees in the south.