People wade through the flooded intersection of Nguyen Tri Phuong and Dien Bien Phu streets in Thanh Khe District past midnight Friday.
Most of them finished work at 5 p.m. Friday but could not leave offices and other places due to the heavy rain and flooding.
It rained through the night and until early Saturday morning, flooding the entire city.
People wade through a flooded section in Thanh Khe District.
Between 7 p.m. and 10 p.m. up to 730 mm of rain was dumped on Da Nang.
On Phan Dang Luu Street, a man who had to get off a taxi with his son and walk two kilometers to Le Duan Road and wait for the water to recede before continuing traveling, said: "I have been living in Da Nang for 30 years but never seen floodwaters rise as fast or as widespread as this one."
Bordering Da Nang City, Thua Thien-Hue Province also received heavy downpours on Friday night, with the highest rainfall level recorded at 650 mm from 7 a.m. to 10 p.m.
Flooding began in the center of Hue, a popular tourist town known for the former Imperial Citadel, at around midnight Friday.
According to the National Center for Hydro -Meteorological Forecasting, storm Son Ca weakened into a tropical depression late Friday and made landfall over Da Nang and Quang Nam at 4 a.m. Saturday.
Heavy rains should be expected along the central coast until Sunday, it said.
A police officer guides vehicles on a flooded street in Hue.
