Tropical storm Kammuri triggered disasters last week that affected one million people in Yunnan province, according to civil affairs officials' estimates, the Xinhua news agency reported.
Kammuri, the third tropical storm to hit China this year, landed in the southern province of Guangdong on August 6, before sweeping westward to Yunnan.
In addition to those killed in Yunnan between Thursday and Monday, at least eight people were missing, Xinhua said.
About 2,700 homes were destroyed in Yunnan and 13,000 were damaged, with officials estimating losses at 549 million yuan (80 million dollars), mostly from damaged crops, officials were quoted as saying.
In Maguan county, one of the worst-hit areas, a landslide on Saturday left nine people dead, two missing and five injured, the report said.