The southwestern province of Guizhou reported 11 deaths, the biggest toll so far, whereas in Fujian province, five people were killed by rain-triggered mudslides and four others drowned, the Ministry of Civil Affairs said.
In Jiangxi province, one person was kill by lightning strikes, two by mudslides and five by collapsed buildings.
The rest of the deaths were reported in Hunan and Guangdong provinces and the Guangxi Zhuang Autonomous Region, state-run Xinhua news agency reported.