Typhoon Kajiki has brought strong winds and heavy rain to southern China's Hainan island and parts of Guangdong province.

Vietnam announced plans to evacuate more than half a million people and ordered boats to stay ashore, while the southern Chinese city of Sanya closed businesses and public transport on Sunday as both braced for an intensifying Typhoon Kajiki.

Two airports in Thanh Hoa and Quang Binh provinces have been shut down, according to the Civil Aviation Authority of Vietnam. Vietnam Airlines and Vietjet have cancelled dozens of flights to and from the area.