Typhoon Mangkhut entered the northern tip of the country in the early hours of Saturday, killing at least four people as it caused floods, landslides and power outages.

A strong typhoon tore through the northern tip of the Philippines on Saturday packing winds of more than 200 kph along with torrential rain, killing four people and causing floods, landslides and power outages.

Mangkhut entered the Philippines as a super typhoon in the early hours, and sent winds and rains across the entire main island of Luzon, home to about half the country's 105 million people.

Typhoon Mangkhut at one point had maximum gusts of 305 kph before it exited the land area before noon and moved towards southern China and Vietnam with reduced wind speeds of 170 kph.

Rapid response teams were on standby with the air force for search and rescue missions as authorities undertook damage assessments in areas in the path of the storm, which felled trees, electricity poles and tore off shop signs and sheet metal roofs hundreds of kilometres away.

Philippine state weather agency PAGASA downgraded the domestic threat level, but warned the danger was far from over, with continued storm surges and heavy rains that could trigger floods and more landslides.