December weather forecast
Hong Kong, Hong Kong

Concluding the year, December depicts the onset of winter in Hong Kong. Although devoid of snowfall, the city sees a drop in temperature, an increase in relative humidity than November, and a significant reduction in rainfall to just 27mm (1.06"). The decline in temperature coupled with short daylight hours lends a winter-like feel to the city. Despite the winter onset, the city experiences a largely dry climate, as evidenced by the minimal rainfall. As Hong Kong metaphorically wraps up the year, the cooler temperatures of December provide a welcome change from the seasons of heat and humidity that precede it.

Temperature

In Hong Kong, the average high-temperature in December slightly decreases from a moderately hot 24.1°C (75.4°F) in November to a pleasant 20.2°C (68.4°F). December registers an average low temperature of 15.9°C (60.6°F), subtly lower than the daytime maximum.

Humidity

The least humid month in Hong Kong is December, with an average relative humidity of 69%.

Rainfall

In Hong Kong, during December, the rain falls for 4.5 days and regularly aggregates up to 27mm (1.06") of precipitation. Throughout the year, there are 137.8 rainfall days, and 2398mm (94.41") of precipitation is accumulated.

Sea temperature

In Hong Kong, in December, the average water temperature is 21°C (69.8°F).
Note: The majority of individuals find swimming in 21°C (69.8°F) to be unenjoyable. The difficulty in controlling breathing rises as the temperature decreases from 21°C (69.8°F) to 15°C (59°F).

Daylight

December has the shortest days of the year, with an average of 10h and 48min of daylight.
On the first day of the month, sunrise is at 06:46 and sunset at 17:38. On the last day of December, in Hong Kong, sunrise is at 07:02 and sunset at 17:50 HKT.

Sunshine

The average sunshine in December is 5.6h.

UV index

January, November and December, with an average maximum UV index of 7, are months with the lowest UV index in Hong Kong, Hong Kong. A UV Index value of 6 to 7 symbolizes a high health vulnerability from exposure to the Sun's UV radiation for average individuals.
Note: In December, a daily maximum UV index of 7 leads to the following instructions:
Exercise precautions and adapt sun safety practices. Defence against skin and eye affliction is paramount. The hours from 10 a.m. to 4 p.m. have the most intense UV radiation. As much as possible, limit direct sun exposure during this period. To mitigate harm from sun exposure, pick sunglasses offering UVA and UVB defense.