Dang Thi Lanh, from the Phu Yen Provincial Committee for Storm and Flood Control said six people were reported dead, and the storm caused VND45 billion (US$2.7 million) worth of damage.
Besides Phu Yen, the other victims were reported in Khanh Hoa, Ninh Thuan, Binh Dinh, and Quang Nam provinces where nearly 2,000 houses and 5,000ha of cropland were damaged by flooding. Transportation was also disrupted after 45km of roads were damaged.
Over 2,000 people remain isolated in Tuy Phuoc District, Binh Dinh Province, and 40,000 students are unable to attend school.
According to local reports, people also remain isolated in Da Nang City, and Quang Nam and Quang Ngai provinces.
The National Centre for Hydrometeorological Forecasting said heavy rain was causing water levels to rise in Vu Gia-Thu Bon River in Quang Nam Province as well as the Ba River in Phu Yen Province.
Forecasters warned of the possibility of further flooding in low-lying regions and landslides in mountainous areas, as more rain will fall in the next two days.