Few beaches have the lifeguard service year-round, but they are cleaned and the facilities (changing etc) are open. Note that the showers are water at ambient temperature, so that will be a bit cold in winter. The shark nets will also often be taken away for repair when the beach has no lifeguards on duty.

Go here for details of which beaches have lifeguard services and when: http://www.lcsd.gov.hk/en/beach/inde...cation-hk.html