Canton, China's third largest city, recorded 8.39 inches of rain in a 24-hour period.
The Lienping mountains, 50 miles to the northeast of the city, recorded 8.69 inches.
The storms that moved through the area produced damaging wind gusts, flooding rain, and even a tornado.
Moisture from the south was blocked by a cool, dry air mass now centered by Beijing. This kept the storms in place, dumping large amounts of rain on the region.
While southern China has had large amounts of rainfall, the plains to the north have been much drier than normal.