December weather forecast
Portmore, Jamaica

December brings a subtle onset of winter in Portmore, Jamaica, with noticeable drops in temperature. Despite the reduced daytime temperatures, they remain warm enough to enjoy outdoor activities comfortably. The rainfall also sees a considerable reduction to approximately 76mm (2.99"), marking the end of the heavy rainfall season. As the year concludes, the city offers a relaxing climate, coupled with a peaceful and serene ambiance.

Note: The weather data used in this content is provided by trusted weather forecast resources and represents average weather conditions. Precise conditions may vary. Accurate, up-to-date information regarding weather forecasts should be referred to before planning a trip.

Temperature

Portmore, Jamaica, marks the onset of December with an average high-temperature of a still warm 27.8°C (82°F), subtly divergent from November's 28.6°C (83.5°F). Portmore's nights in December experience an average temperature drop to an agreeable 22.4°C (72.3°F).

Heat index

The heat index for December is appraised at a hot 32°C (89.6°F). Exhaustion might be the outcome of enduring exposure and continuous activity, with a risk of heat cramps.
Understand that the heat index values take into account shaded locations and mild winds. A rise of up to 15 Fahrenheit (8 Celsius) degrees in the heat index could result from direct sunlight.
Note: The heat index, also known as 'apparent temperature' or 'real feel', is a numerical representation of warmth when taking temperature and moisture levels into account. This effect is subjective, differing among individuals based on their physical activity and perception of heat, which can be influenced by factors like wind, clothing, and metabolic variances. Be aware that direct exposure to sunlight increases heat impact and may raise the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are highly important for children. Young children typically face greater hazards than adults because they do not sweat as much. Their larger skin surface in comparison to their little bodies and the high heat production from their active nature compounds their vulnerability.

Humidity

In December, the average relative humidity in Portmore is 81%.

Rainfall

In Portmore, Jamaica, in December, it is raining for 25.7 days, with typically 76mm (2.99") of accumulated precipitation. Throughout the year, in Portmore, there are 310.9 rainfall days, and 1286mm (50.63") of precipitation is accumulated.

Sea temperature

In Portmore, Jamaica, in December, the average water temperature is 28.3°C (82.9°F).
Note: A water temperature from 25°C (77°F) to 29°C (84.2°F) is considered very warm and enjoyable, allowing water activities to be pleasant for extended periods without irritation.

Daylight

The month with the shortest days is December, with an average of 11h and 6min of daylight.
On the first day of the month, sunrise is at 06:22 and sunset at 17:30. On the last day of December, sunrise is at 06:38 and sunset at 17:43 EST.

Sunshine

The month with the least sunshine is December, with an average of 6.5h of sunshine.

UV index

The months with the lowest UV index are January through May, November and December, with an average maximum UV index of 6. A UV Index estimate of 6 to 7 represents a high health vulnerability from exposure to the Sun's UV rays for the average person.
Note: The maximum UV index, 6 during December, leads to the following recommendations:
Implement precautions and maintain sun safety methods. Avoidance of sunburn is demanded. UV radiation from the Sun is most intense between 10 a.m. and 4 p.m. Try to avoid direct sunlight during this period. Sun protection is enhanced with clothing that boasts a tight weave yet offers a loose fit. Attention! UV strength is notably upped by the reflection of sand and water.