Tens of thousands of travelers had plans disrupted after Hong Kong's global airport, a major regional hub, cancelled most flights.
Hong Kong and southern China hunkered down under red alert as strong winds and heavy rain from Typhoon Mangkhut lashed the densely populated coast, a day after the biggest storm of the year left at least 28 dead from landslides and drownings in the northern Philippines.
They were advised not to return home until the lingering danger had passed.
The biggest storm of the year has been downgraded from a "super" to a "severe" typhoon, but it is still considered very unsafe and the city issued its highest storm warning of Level 10 as winds of up to 117 miles per hour began closing in on the southern coast of China.
Some 105,000 people in the Philippines were staying in temporary shelters after the mass evacuation of coastal areas following major storm surge warnings.
Businesses and residents on Luzon, an island home to millions, were making last-minute preparations as forecasters warned of wind gusts as high as 255 kilometers per hour.
However, the typhoon has weakened slightly into a severe typhoon.
Southeastern China has also been taking precautions, as the typhoon is expected to reach its mainland by Monday morning.
Manila Electric Co. said 430,000 customers in the capital region and nearby provinces are without electricity.
Francis Tolentino, an adviser to President Rodrigo Duterte, said most of the fatalities were killed in landslides in mountainous areas.
With destructive winds and blinding rains ripping off the tin roof of a building and toppling over this gas station.
In Hong Kong residents have taped up windows and stocked up on water and supplies after authorities warned the storm could be one of the worst to ever hit the city.
A member of the Philippine Air Force stands in front of a satellite image of Typhoon Mangkhut, locally named Typhoon Ompong, at the National Disaster Risk Reduction and Management Council operations center in metropolitan Manila, Philippines.
"Representatives from relevant bureaus and departments also reported their preparatory work and contingency plans, particularly on measures in the prevention and handling of flooding, backflow of seawater and emergency plans for high-risk locations", a government statement read.
Here an elderly resident of the town of Aparri on the north coast of Luzon is seen during the high winds and rain. More than five million people were in its path.
The country's deadliest storm on record is Super Typhoon Haiyan, which left more than 7,350 people dead or missing across the central Philippines in November 2013.
Most shops and public services are shut, and more than 800 flights have been cancelled at Hong Kong International Airport - affecting more than 100,000 passengers.
As the storm headed for China, Cathay Pacific airline said it expects more than 400 flight cancelations over the next three days.
The Philippine Civil Defence chief, Ricardo Jalad, said during an emergency meeting that about 4.2 million people in the northeastern Cagayan province were vulnerable from the typhoon, which has an eye measuring 78 miles across.