Officials reported the deaths in Baoding, about 150 kilometers (90 miles) from Beijing, adding that 18 people were missing.
Storm Doksuri, a former super typhoon that hit mainland China last Friday, has brought the most severe rains to the region since records began 140 years ago.
By noon Saturday (0400 GMT), more than 600,000 of Baoding’s 11.5 million residents had been evacuated from areas deemed to be at risk, officials said.
Natural disasters caused 147 deaths or disappearances last month, China said Friday, after the heaviest rains since records began to hit the country’s capital.
China’s Ministry of Emergency Management said 142 of the deaths or disappearances recorded in July were caused by flooding or geological disasters.
AFP saw rescuers using boats to ferry instant noodles, bread, and drinking water to residents who could not or did not want to leave properties engulfed by water.
Millions of people have been hit by extreme weather events and prolonged heatwaves around the globe in recent weeks, events that scientists say are being exacerbated by climate change.
Ma Jun, director of the Beijing-based NGO the Institute of Public and Environmental Affairs, said that while the typhoon had brought rain, rising ocean temperatures due to climate change were also causing extreme weather.
“China has suffered unprecedented extreme heatwaves since last year… This year, there are record-breaking high temperatures in Northern China,” Ma told AFP this week.
“These heatwaves are linked to global warming, and this is what most climate scientists around the world tend to agree,” he said.