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.

A powerful typhoon has made landfall in northeast Vietnam, south of Hanoi, with schools and airports closed, and more than 586,000 people evacuated.