Children buried themselves in the sand at Repulse Bay Beach on Monday to beat the heat, as the mercury hit 25 degrees Celsius on the fourth day of the Lunar New Year.
Temperatures reached 28 degrees in parts of the New Territories as sunny and cloudless skies prevailed over most of southern China.
But the warm weather won't last, with temperatures set to drop back to the low to mid teens by the weekend.
According to the Hong Kong Observatory, the city will reach lows of 17C through the rest of this week, plunging to 13C on Sunday.
This Lunar New Year was unusually warm, with temperatures hitting 26C in some areas of Hong Kong.
Traditionally, the weather in Hong Kong during this period is cloudy with showers.
The warmer weather this weekend led to a flood of tourists to Hong Kong's outlying islands. On Lamma, tourists and residents were forced to queue in order to board ferries on and off the island on Sunday and Monday.
Macau saw about 2.7 million people, mostly mainlanders and a smaller portion of Macanese, cross in and out through the main Gongbei Port checkpoint at Zhuhai by the end of the week-long holiday.