Quanzhou County in Guangxi Zhuang Autonomous Region has been afflicted by a severe drought since July, causing heavy losses to agricultural production.
Up north, however, flooding has become an issue.
Ten rounds of rainfall have battered north China's Shandong Province since the beginning of July.
The province received 328.1 mm of rainfall in July, a 50-year high.
From Thursday to Monday, heavy rains severely affected 399,000 people and destroyed 440 houses in Shandong.
In arid northwest China, Gansu Province received double the average annual precipitation recorded for the past 30 years in July.
"It is certain that there is a trend of increasing extreme weather events in summer," said Zhao Hongyan, an engineer with the Northwest China Climate Center.
Arid northwest China is more vulnerable to rainstorm-triggered landslides and torrential flooding, and people there have been warned to enhance their awareness of flood and waterlogging prevention, he added.
Twenty-four people died and one person was reported missing after rainstorm-triggered floods and flows of mud and rock hit Tianshui City in Gansu on July 25.
Four rounds of downpours swept Tianshui City in July, triggering floods, landslides and mud-rock flows in seven townships and affecting 1.22 million people.
(Xinhua contributed to the story)