Port of Spain
Trinidad and Tobago
Long-term weather forecast
Long-term weather forecast

December weather forecast and climate
Port of Spain, Trinidad and Tobago

The ancient building hosting the public library of the Port of Spain in Trinidad and Tobago, with palm trees outside
The ancient building hosting the public library of the Port of Spain in Trinidad and Tobago, with palm trees outside
December, the first month of the winter, in Port of Spain, is also a hot month, with average temperature fluctuating between 31.1°C (88°F) and 21°C (69.8°F).

Temperature

In December, the average high-temperature is essentially the same as in November - a still hot 31.1°C (88°F). In Port of Spain, the average low-temperature is 21°C (69.8°F).

Heat index

The average heat index in December is appraised at a blistering 42.7°C (108.9°F). Beware - heat cramps and heat exhaustion are very likely. Heatstroke is imminent with prolonged activity.
Take into consideration that the heat index values are calculated for shade and light wind conditions. Exposure to direct sunshine can increase heat index values by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature', 'apparent temperature', 'real feel', or 'feels like', is what the temperature feels like to the human body when the air temperature is combined with the relative humidity. This effect is individual, with diverse people perceiving weather differently for numerous reasons (pregnancy, metabolic differences, clothing), and activity. Be aware that direct exposure to sunlight increases heat impact, and may raise the heat index additionally, by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are especially crucial for babies and toddlers. Young children are generally more endangered than adults, as they usually less sweat. And also, due to larger skin surface relative to their small bodies and higher heat production as a result of their activity.
Perspiration is the human body's physiological response to high temperatures and is an attempt to lower body temperature through evaporation of sweat. With a lot of moisture in the air, the evaporation process is not as effective, and the body does not cool down as efficiently, creating a perception of overheating. If the body can not disperse the excessive heat and body temperature reaches conditions of hyperthermia, above 37.5°C (99.5°F) to 38.3°C (100.9°F), thermal conditions are potentially life-threatening.

Humidity

In December, the average relative humidity in Port of Spain is 84%.

Rainfall

In Port of Spain, during December, the rain falls for 13 days and regularly aggregates up to 75.7mm (2.98") of precipitation. Throughout the year, in Port of Spain, there are 166 rainfall days, and 1408mm (55.43") of precipitation is accumulated.

Sea temperature

In December, the average sea temperature in Port of Spain, Trinidad and Tobago, is 27°C (80.6°F).
Note: For any water activity, surface water temperatures between 25°C (77°F) and 29°C (84.2°F) are considered as excellent and extremely pleasant for lengthened periods.

Daylight

The month with the shortest days is December, with an average of 11.5h of daylight.

Sunshine

The average sunshine in Port of Spain is 6.9h.

UV index

December is the month with the lowest UV index, with an average maximum UV index of 9. A UV Index value of 8 to 10 symbolizes a very high threat to health from unprotected exposure to the Sun's UV rays for the ordinary person.
Note: The average daily UV index of 9 in December transform into the following instructions:
Take extra precautions. Protection against sun damage is required. The Sun's UV radiation is most powerful between 10 a.m. and 4 p.m. To the extent possible, limit exposure to the direct sun during these hours. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects. A broad-spectrum sunscreen of SPF 30+ should be liberally applied and re-applied every two hours, and immediately after an outdoor workout or a swim. Caution! The reflection of sand and water significantly increases the intensity of the Sun's UV radiation.

What is the temperature in December in Port of Spain?

The average high-temperature, in December, in Port of Spain, is 31.1°C (88°F), while the average low-temperature is 21°C (69.8°F). In December, the average heat index (a.k.a. 'felt air temperature', 'apparent temperature'), that represents influence of the relative humidity to air temperaure, is estimated at 42.7°C (108.9°F).

What is the average humidity in December in Port of Spain?

The average relative humidity in December in Port of Spain, Trinidad and Tobago, is 84%.

How many days does it rain in December in Port of Spain?

In Port of Spain, Trinidad and Tobago, in December, during 13 rainfall days, 75.7mm (2.98") of precipitation is typically accumulated.

What is the sea water temperature in December in Port of Spain?

In Port of Spain, the average seawater temperature in December is 27°C (80.6°F). Water temperature between 25°C (77°F) and 29°C (84.2°F) is regarded as very warm and enjoyable by all. With these temperatures, water activities are pleasurable, without feeling uncomfortable for prolonged periods.

What is the month with the shortest days in Port of Spain?

December has the shortest days of the year in Port of Spain, with an average of 11.5h of daylight.

How many hours of daylight does Port of Spain have in December?

The average length of the day in December in Port of Spain is 11.5h.

How many hours of sunshine does Port of Spain have in December?

In Port of Spain, Trinidad and Tobago, the average sunshine in December is 6.9h.

What is the month with the lowest UV index in Port of Spain?

With an average maximum UV index of 9, December is the month with the lowest UV index in Port of Spain, Trinidad and Tobago.

What is the UV index intensity in December in Port of Spain?

The average daily maximum UV index in December is 9. A UV Index reading of 8 to 10 represents a very high health risk from unprotected exposure to the UV radiation.
Average temperature in December - Port of Spain, Trinidad and Tobago
  • Average high temperature in December: 31.1°C

The warmest month (with the highest average high temperature) is May (33.1°C).
The month with the lowest average high temperature is January (28°C).

  • Average low temperature in December: 21°C

The month with the highest average low temperature is June (23.3°C).
The coldest month (with the lowest average low temperature) is January (17°C).

Average humidity in December - Port of Spain, Trinidad and Tobago
  • Average humidity in December: 84%

The month with the highest relative humidity is November (86%).
Months with the lowest relative humidity are March and April (77%).

Average rainfall in December - Port of Spain, Trinidad and Tobago
  • Average rainfall in December: 75.7mm

The wettest month (with the highest rainfall) is August (244mm).
The driest month (with the lowest rainfall) is March (16.9mm).

Average rainfall days in December - Port of Spain, Trinidad and Tobago
  • Average rainfall days in December: 13 days

The month with the highest number of rainy days is July (21 days).
Months with the lowest number of rainy days are March and April (6 days).

Average sea temperature in December - Port of Spain, Trinidad and Tobago
  • Average sea temperature in December: 27°C

The best month for swimming (with the highest average sea temperature) is September (29°C).
Coldest months (with the lowest average sea temperature) are February and March (26°C).

Average daylight in December / Average sunshine in December - Port of Spain, Trinidad and Tobago
  • Average daylight in December: 11.5h

Months with the longest days are June and July (Average daylight: 12.7h).
The month with shortest days is December (Average daylight: 11.5h).

  • Average sunshine in December: 6.9h

The month with most sunshine is February (Average sunshine: 8.3h).
The month with least sunshine is June (Average sunshine: 6.1h).

Average UV index in December - Port of Spain, Trinidad and Tobago
  • Average UV index in December: 9

Months with the highest UV index are February, March, April, May, June, July, August, September and October (UV index 12).
The month with the lowest UV index is December (UV index 9).