Another 20 people remained missing in Zhejiang province, the official Xinhua News Agency said.
Typhoon Lekima made landfall at 1:45 a.m. Saturday in Wenling city, about 300 kilometers (190 miles) south of Shanghai, the China Meteorological Administration said.
The deaths occurred in Yongjia county on the outskirts of Wenzhou, a major port city. The river blocked by a landslide rose to a level of 10 meters (30 feet) within 10 minutes, trapping 120 villagers, Xinhua said.
More than 1 million people were evacuated before the storm struck, including 253,000 in Shanghai.
Shanghai Disneyland was closed, as were some popular tourist areas along the riverfront in the city's historic Bund district.
"Of course, it's a little disappointing, but it's because of the weather so we can all understand, right. This is a natural disaster, isn't it?" said Wang Chunguang, who was visiting from Jiangsu province north of Shanghai.
CCTV said 3,023 airline flights in Shanghai, Hangzhou and other cities and some train services were canceled. Authorities in Shanghai also shut down the high-speed magnetic levitation train to Pudong International Airport.
Lekima, downgraded to a tropical storm, was heading slowly northward along China's east coast on Sunday morning.