Jebi, which hit Longlou Township at about 7:30 p.m. Friday, is the ninth tropical storm to hit China this year, China's state-run Xinhua News Agency reported.
The storm caused flooding and downed a number of trees in Longlou Friday night.
"It was just like pouring water outside. The trees were shaking wildly, and motorbikes parked at the roadside were all blown down," said Huang Liangjin, a security guard at a restaurant in Longlou.
Hainan province's high-speed railway has been shut down and flights in and out of Sanya Phoenix International Airport in the tourist city of Sanya have been grounded.
Maritime traffic has been halted due to the storm.