December weather forecast
Puerto Rico, Spain

December wraps up the year in Puerto Rico with the chill of winter and consistent rainfall, signifying the peak of the wet season. The precipitation reaches its zenith at 51mm (2.01"), exceeding all months prior. An all-year low daylight duration serves as a strong winter indicator. The sea registers its coolest temperatures, restricting water activities. As the year ends, inclement weather episodes may arise periodically, sealing off a versatile weather year.

Temperature

Puerto Rico measures an average high-temperature of an enjoyable 19°C (66.2°F) in December, nearly consistent with the preceding month. December nights in Puerto Rico are marked by an average low-temperature of 13°C (55.4°F).

Rainfall

The month with the most rainfall is December, when the rain falls for 4 days and typically aggregates up to 51mm (2.01") of precipitation.

Sea temperature

In Puerto Rico, Spain, the average seawater temperature in December is 20.8°C (69.4°F).
Note: For most people, a water temperature of 20.8°C (69.4°F) is not conducive to enjoyable swimming. Breathing control becomes harder as the water temperature dips below 21°C (69.8°F).

Daylight

With an average of 10h and 24min of daylight, December has the shortest days of the year.
On the first day of December in Puerto Rico, sunrise is at 07:36 and sunset at 18:07. On the last day of the month, sunrise is at 07:53 and sunset at 18:18 WET.

Sunshine

January, November and December, with an average of 6h of sunshine, are months with the least sunshine in Puerto Rico.

UV index

The months with the lowest UV index in Puerto Rico are January and December, with an average maximum UV index of 4. A UV Index estimate of 3 to 5 represents a medium vulnerability from exposure to the Sun's UV rays for the average person.
Note: The maximum daily UV index, 4 in December, converts into the following recommendations:
Heed the precautions - Suggestions to avoid sunburn are made. The Sun's harshest UV rays are around midday; it's wise to seek shade and limit time outdoors. For optimum UV protection, wear sun-resistant attire complemented with a hat and quality shades.