The China Central Meteorological Station forecast early Wednesday heavy rains would sweep Guangdong, Fujian, Guangxi, Jiangxi and Hunan due to the effects of the storm.
From June 6 to 16, nine provinces in the country's east, south and southwest had experienced torrential rain, leaving 63 people dead, 13 missing and 1.6 million people displaced, according to the Ministry of Civil Affairs.
Hong Kong also saw heavy rains on Wednesday. All schools in the region stopped classes on Wednesday morning.
The storm was downgraded from a typhoon level. Hundreds were dead or missing in the Philippines after Typhoon Fengshen ripped through the archipelago on Friday afternoon.