Pabuk made a landfall at about 4:00 p.m., packing up wind of 20 meters per second, and was moving toward northeast while abating, the administration said on its website.
Weather forecast from Guangzhou Observatory in south China's Guangdong Province said early Friday that Pabuk would fade away in 24 hours after the landing, bringing gales and heavy rain to Hong Kong.
Trading in the Hong Kong stock market had also been suspended after the cyclone warning was issued.
Meanwhile, the eighth tropical storm of this year Wutip, which means butterfly, is forecast to hit Fujian Province in east China Friday with more powerful impact.