December weather forecast
Cozumel, Mexico

Palm trees and clear blue waters on Chen Rio white sandy beach in Cozumel, Mexico
Palm trees and clear blue waters on Chen Rio white sandy beach in Cozumel, Mexico

Weather in December

The first month of the winter, December, is also a moderately hot month in Cozumel, Mexico, with temperature in the range of an average low of 20.3°C (68.5°F) and an average high of 28.6°C (83.5°F).

Temperature

The coldest months are January and December, with an average high-temperature of 28.6°C (83.5°F).

Heat index

The average heat index in December is appraised at a tropical 34°C (93.2°F). Take special precautions - heat exhaustion and heat cramps are expected. Heatstroke may occur with lengthy 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 'real feel', 'feels like', 'felt air temperature', or 'apparent temperature', combines air temperature and relative humidity to represent a human perceived temperature equivalent. This effect is subjective, depending on the activity and individual's heat perception influenced by various reasons (differences in body mass, height, and shape, wind, clothing). 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 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.

Humidity

The average relative humidity in December in Cozumel is 83%.

Rainfall

In December, the rain falls for 9.8 days. Throughout December, 107mm (4.21") of precipitation is accumulated. In Cozumel, during the entire year, the rain falls for 119.9 days and collects up to 1490mm (58.66") of precipitation.

Sea temperature

In Cozumel, the average seawater temperature in December 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

With an average of 10h and 55min of daylight, December has the shortest days of the year in Cozumel, Mexico.
On the first day of the month, sunrise is at 7:07 am and sunset at 6:06 pm. On the last day of December, in Cozumel, sunrise is at 7:23 am and sunset at 6:18 pm EST.

Sunshine

In Cozumel, the average sunshine in December is 6.2h.

UV index

January and December, with an average maximum UV index of 7, are months with the lowest UV index. A UV Index estimate of 6 to 7 represents a high health hazard from exposure to the Sun's UV radiation for average individuals.
Note: In December, the average maximum UV index of 7 translate into the following recommendations:
Take precautions against overexposure. Fair-skinned people may get burned in less than 20 minutes. Seek shade and minimize exposure to direct Sun in a period between 10 a.m. and 4 p.m. when UV radiation is most intense; keep in mind that shade structures like parasols or canopies do not provide perfect sun protection. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes. Beware! The reflection of water and sand dramatically increases exposure to the UV rays.
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FAQ

What is the coldest month in Cozumel?

January and December, with an average high-temperature of 28.6°C (83.5°F), are the coldest months.

What is the temperature in December in Cozumel?

In December, in Cozumel, the average high-temperature is 28.6°C (83.5°F), and the average low-temperature is 20.3°C (68.5°F). in December, the average heat index (a.k.a. 'apparent temperature', 'feels like'), which represents the influence of relative humidity on air temperature, is appraised at 34°C (93.2°F).

What is the average humidity in December in Cozumel?

In Cozumel, Mexico, the average relative humidity in December is 83%.

How many days does it rain in December in Cozumel?

In Cozumel, Mexico, in December, it is raining for 9.8 days, with typically 107mm (4.21") of accumulated precipitation.

What is the sea water temperature in December in Cozumel?

In Cozumel, Mexico, 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 Cozumel?

With an average of 10h and 55min of daylight, December has the shortest days of the year in Cozumel.

How many hours of daylight does Cozumel have in December?

In Cozumel, the average day length in December is 10h and 55min.

When are sunrise and sunset in December in Cozumel?

In December, on the first day of the month, sunrise is at 7:07 am and sunset at 6:06 pm. On the last day of the month, sunrise is at 7:23 am and sunset at 6:18 pm EST.

How many hours of sunshine does Cozumel have in December?

The average sunshine duration in December is 6.2h.

What are the months with the lowest UV index in Cozumel?

The months with the lowest UV index in Cozumel, Mexico, are January and December, with an average maximum UV index of 7.

What is the UV index reading in December in Cozumel?

In Cozumel, the average daily maximum UV index in December is 7. A UV Index value of 6 to 7 symbolizes a high health risk from exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average sunshine
Average UV index

Average temperature in December
Cozumel, Mexico

Average temperature in December - Cozumel, Mexico
  • Average high temperature in December: 28.6°C

The warmest month (with the highest average high temperature) is August (33°C).
The months with the lowest average high temperature are January and December (28.6°C).

  • Average low temperature in December: 20.3°C

The month with the highest average low temperature is June (23.8°C).
The coldest months (with the lowest average low temperature) are January and February (19.4°C).

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Average humidity in December
Cozumel, Mexico

Average humidity in December - Cozumel, Mexico
  • Average humidity in December: 83%

The month with the highest relative humidity is September (87%).
The months with the lowest relative humidity are March and April (79%).

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Average rainfall in December
Cozumel, Mexico

Average rainfall in December - Cozumel, Mexico
  • Average rainfall in December: 106.8mm

The wettest month (with the highest rainfall) is October (242.5mm).
The driest month (with the least rainfall) is March (32.2mm).

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Average rainfall days in December
Cozumel, Mexico

Average rainfall days in December - Cozumel, Mexico
  • Average rainfall days in December: 9.8 days

The month with the highest number of rainy days is October (15.7 days).
The month with the least rainy days is April (3.7 days).

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Average sea temperature in December
Cozumel, Mexico

Average sea temperature in December - Cozumel, Mexico
  • Average sea temperature in December: 27°C

The best months for swimming (with the highest average sea temperature) are July, August, September and October (29°C).
The coldest months (with the lowest average sea temperature) are February and March (26°C).

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Average daylight in December /
Average sunshine in December
Cozumel, Mexico

Average daylight in December / Average sunshine in December - Cozumel, Mexico
  • Average daylight in December: 10h and 55min

The month with the longest days is June (Average daylight: 13h and 21min).
The month with the shortest days is December (Average daylight: 10h and 55min).

  • Average sunshine in December: 6h and 12min

The month with the most sunshine is April (Average sunshine: 8h and 36min).
The months with the least sunshine are September and November (Average sunshine: 6h and 6min).

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Average UV index in December
Cozumel, Mexico

Average UV index in December - Cozumel, Mexico
  • Average UV index in December: 7

The months with the highest UV index are April, May, June, July and August (UV index 12).
The months with the lowest UV index are January and December (UV index 7).

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