The most recent deaths came in mountainous western Sichuan province, where eight were killed and 23 missing as of Wednesday morning. Earlier in August, 39 were killed and nine left missing by Typhoon Lekima.
The total for July was 154 killed and 31 missing, with more than 1.3 million people forced to seek temporary shelter.
Annual floods rank among China's most destructive natural disasters, brought on by seasonal rains and worsened by human encroachment into mountain areas and natural river systems.
China's worst flooding in recent years came in 1998, when more than 3,700 died in floods along the Yangtze, Songhua, Pearl and Nen rivers.
Landslides have also killed dozens this year, with two killed and seven other people missing after slides hit in western Sichuan, where communications and power were cut off. Earlier this month, 17 railway workers were killed in a landslide in Sichuan province while seeking to repair tracks damaged by an earlier landslide.