The lowest temperatures are generally expected to range from 24 to 27 degrees Celsius, with highs of 30 to 33 degrees Celsius.
Earlier, on the afternoon of October 16, many areas in southern Vietnam saw showers and thunderstorms, with rainfall generally at 5-20mm and more than 25mm in some places.
Residents of Ho Chi Minh City struggle through the evening downpour (Photo: Hoang Huong).
From now until October 22, waters off Lam Dong Province will see easterly to north-easterly winds at force 4, at times force 5. Waves will be 0.75-1.75 metres high, occasionally exceeding 2 metres during thunderstorms, with slight seas.
Waters from Ho Chi Minh City to Ca Mau will see easterly to north-easterly winds at force 3-4, with waves of 0.5-1.75 metres. During thunderstorms, waves may at times exceed 1.75 metres. Seas will be calm, occasionally becoming slightly rough during storms.
In waters from Ca Mau to Kien Giang and Phu Quoc, winds will be light, with waves of 0.5-1.5 metres and calm seas. Weather at sea will bring scattered showers and thunderstorms. During thunderstorms, there is a high risk of waterspouts and strong gusts of force 7-8.
The meteorological agency warned people to guard against dangerous weather such as lightning, waterspouts and strong gusts during thunderstorms. Fishermen operating at sea were urged to closely monitor forecasts and weather warnings to take preventive action.