December weather forecast
Naha, Japan

December enhances the cooler climate in Naha, Japan, with the sharp fall in temperatures establishing the onset of winter. As the temperature goes down, there is a simultaneous drop in rainfall levels, closing the year on a drier note of 103mm (4.06"). The reduction in rainfall continues from November, signaling the city's move towards colder months. Despite the cooler weather, day activities remain unaffected due to the ample amount of daylight. The decline in sea temperatures indicates the approaching winter, reducing the interest in water-related activities.

Temperature

In December, the average high-temperature in Naha, Japan, marginally decreases from a moderately hot 24.6°C (76.3°F) in November to an agreeable 21.2°C (70.2°F). Nighttime temperature reflects an average dip to a refreshing 16.3°C (61.3°F) in December, subtly cooler than its daytime highs.

Humidity

The least humid month in Naha is December, with an average relative humidity of 66%.

Rainfall

The month with the least rainfall in Naha, Japan, is December, when the rain falls for 9.6 days and typically collects 103mm (4.06") of precipitation.

Sea temperature

In December, the average sea temperature is 23.7°C (74.7°F).
Note: For someone not comfortable with cold, swimming in 23.7°C (74.7°F) waters might be a stretch. However, with favorable conditions like abundant sunshine, mild wind, and warm air temperatures, the experience can be improved. And while wetsuits are not a must, they can be considered.

Daylight

With an average of 10h and 30min of daylight, December has the shortest days of the year.
On the first day of the month, sunrise is at 06:59 and sunset at 17:36. On the last day of December, sunrise is at 07:16 and sunset at 17:48 JST.

Sunshine

The average sunshine in December is 3.7h.

UV index

With an average maximum UV index of 5, December is the month with the lowest UV index. A UV Index reading of 3 to 5 represents a medium vulnerability from unprotected exposure to Sun's UV rays for the average person.
Note: The maximum daily UV index of 5 during December translates into the following directions:
Make use of precautions - Suggestions to resist sunburn are communicated. Exposing oneself to the midday Sun can be harmful due to the strong UV radiation; limit your time outside. In bright sunlight, prioritize sunglasses that grant protection from UVA and UVB radiation. Take note! The UV strength of the Sun elevates when reflected off water and sand.