December weather forecast and climate
Cotonou, Benin

December, the first month of the winter, in Cotonou, is still a tropical month, with temperature in the range of an average high of 30.8°C (87.4°F) and an average low of 23.8°C (74.8°F).
The ideal sea water temperature of 28°C (82.4°F) and only 2 rainfall days, with 19.6mm (0.77") of accumulated rainfall, makes December the best time for swimming and other water activities.

Temperature

In December, the average high-temperature in Cotonou is practically the same as in November - a still tropical 30.8°C (87.4°F). The average low-temperature, in Cotonou, is 23.8°C (74.8°F).

Heat index

The average heat index in December is evaluated at an extremely hot 40.6°C (105.1°F). Take special precautions - heat exhaustion and heat cramps are expected. Heatstroke may occur with lengthy activity.
Note that heat index values are valued for light wind and location in the shade. 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', 'feels like', 'real feel', or 'apparent temperature', is calculated by taking the relative humidity value for a specific location and factoring it into the air temperature reading. Additional factors like activity, wind, metabolic differences, and clothing affect individual temperature impact. Bear in mind that direct sunshine exposure increases weather impact, and may raise heat index 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.
The human body normally cools itself by perspiration. Excessive warmth is eliminated from the body by evaporation of sweat. When the relative humidity is high, the evaporation rate is reduced. The warmth is removed from the body at a lower rate, causing the body to retain more heat than it would in dry air. When heat gain surpasses the level the body can shed, body temperature begins to increase, and consequently, overheating and dehydration can occur, with varying severity.

Humidity

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

Rainfall

In Cotonou, Benin, during December, the rain falls for 2 days and regularly aggregates up to 19.6mm (0.77") of precipitation. Throughout the year, there are 75 rainfall days, and 1308.3mm (51.51") of precipitation is accumulated.

Sea temperature

In Cotonou, the average water temperature is 28°C (82.4°F).
Note: For swimming, diving, and other water activities, temperatures between 25°C (77°F) and 29°C (84.2°F) are perceived as very enjoyable and pleasurable for prolonged periods without feeling uncomfortable.

Daylight

Months with the shortest days in Cotonou, Benin, are January, November and December, with an average of 11.8h of daylight.

Sunshine

The average sunshine in Cotonou is 7.2h.

UV index

With an average maximum UV index of 10, December is the month with the lowest UV index. A UV Index estimate of 8 to 10 represents a very high health vulnerability from unsafe exposure to the UV radiation for the average person.
Note: The average daily UV index of 10 transform into the following instructions:
Take extra precautions. Fair-skinned individuals may get burned in less than 10 minutes. 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 Cotonou?

In December, in Cotonou, the average high-temperature is 30.8°C (87.4°F), and the average low-temperature is 23.8°C (74.8°F). The average heat index (a.k.a. 'apparent temperature', 'real feel'), that represents influence of the relative humidity to air temperaure, in December is calculated to 40.6°C (105.1°F).

What is the average humidity in December in Cotonou?

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

How many days does it rain in December in Cotonou?

In December, in Cotonou, the rain falls for 2 days. Throughout December, 19.6mm (0.77") of precipitation is accumulated.

How warm is the water in December in Cotonou?

In December, the average sea temperature is 28°C (82.4°F). For swimming, diving, and other water activities, temperatures between 25°C (77°F) and 29°C (84.2°F) are perceived as very enjoyable and pleasurable for prolonged periods without feeling uncomfortable.

What is the month with the shortest days in Cotonou?

Months with the shortest days in Cotonou are January, November and December, with an average of 11.8h of daylight.

How many hours of daylight does Cotonou have in December?

In December, the average length of the day is 11.8h.

How many hours of sunshine does Cotonou have in December?

In December, the average sunshine in Cotonou, Benin, is 7.2h.

When is the lowest UV index in Cotonou?

December is the month with the lowest UV index in Cotonou, with an average maximum UV index of 10.

What is the UV index intensity in December in Cotonou?

In December, the average daily maximum UV index in Cotonou is 10. A UV Index value of 8 to 10 symbolizes a very high health risk from the exposure to the Sun's UV radiation.
Average temperature in December - Cotonou, Benin
  • Average high temperature in December: 30.8°C

The warmest month (with the highest average high temperature) is March (31.9°C).
The month with the lowest average high temperature is August (27.8°C).

  • Average low temperature in December: 23.8°C

The month with the highest average low temperature is March (25.9°C).
The coldest month (with the lowest average low temperature) is August (23.4°C).

Average humidity in December - Cotonou, Benin
  • Average humidity in December: 81%

The month with the highest relative humidity is June (84%).
The month with the lowest relative humidity is April (76.5%).

Average rainfall in December - Cotonou, Benin
  • Average rainfall in December: 19.6mm

The wettest month (with the highest rainfall) is June (356mm).
The driest month (with the least rainfall) is January (9.2mm).

Average rainfall days in December - Cotonou, Benin
  • Average rainfall days in December: 2 days

The month with the highest number of rainy days is June (15 days).
The month with the least rainy days is January (1 days).

Average sea temperature in December - Cotonou, Benin
  • Average sea temperature in December: 28°C

The best months for swimming (with the highest average sea temperature) are March, April, May and November (29°C).
The coldest month (with the lowest average sea temperature) is August (25°C).

Average daylight in December / Average sunshine in December - Cotonou, Benin
  • Average daylight in December: 11.8h

Months with the longest days are June and July (Average daylight: 12.5h).
Months with the shortest days are January, November and December (Average daylight: 11.8h).

  • Average sunshine in December: 7.2h

The month with the most sunshine is November (Average sunshine: 8.1h).
The month with the least sunshine is July (Average sunshine: 4.4h).

Average UV index in December - Cotonou, Benin
  • Average UV index in December: 10

Months with the highest UV index are February, March, April, May, August, September and October (UV index 12).
The month with the lowest UV index is December (UV index 10).