Co-May, the eighth typhoon of this year, made landfall in east China's Zhejiang Province at about 4.30 a.m. Wednesday, according to the provincial meteorological observatory.
The typhoon, with the maximum wind force near its centre reaching 23 metres per second, churned ashore at Zhoushan City of Zhejiang, news agency reported.
Zhejiang upgraded the emergency response level for Typhoon Co-May from IV to III at 3.00 p.m. on Tuesday, according to the provincial emergency management department.
China has a four-tier emergency response system, with Level I being the most severe response.
Earlier on July 28, China's Ministry of Water Resources had activated a Level-IV emergency flood response in four provincial-level regions -- Shanghai, Jiangsu, Anhui and Jiangxi -- in response to Typhoon Co-May, the eighth typhoon of the year.