Heavy rains of up to 300 millimeters are expected to batter northern and north-central provinces from Wednesday until the rest of the week, the National Center for Hydro-meteorological Forecasting reported.
An average rainfall of 100-250 millimeters is forecast to fall on northern and north-central localities from Wednesday night to Monday next week.
The downpours may exceed 300 millimeters in some locations.
The weather pattern will pose a high risk of inundation in low-lying areas as well as flash floods and landslides in mountainous localities.
In central, south-central, and southern Vietnam, precipitation of 20-70 millimeters was recorded on Monday.
Similar rains are expected to linger in the regions until the end of Wednesday and mainly occur in the afternoon and evening.
The rains may be accompanied by gusts and thunderstorms.
On Tuesday, showers and thunderstorms will occur in the central and southern parts of the East Vietnam Sea.
In the maritime areas between south-central Binh Thuan Province and southern Ca Mau Province, strong winds and waves of two to three meters high are expected.