Cozumel
Mexico
Long-term weather forecast
Long-term weather forecast

December weather forecast and climate
Cozumel, Mexico

A small blue boat, palm trees, and clear blue waters on Chen Rio white sandy beach in Cozumel, Mexico, with a small island
A small blue boat, palm trees, and clear blue waters on Chen Rio white sandy beach in Cozumel, Mexico, with a small island
The first month of the winter, December, is still a warm month in Cozumel, Mexico, with average temperature varying between 20.3°C (68.5°F) and 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 is estimated at a tropical 34.2°C (93.6°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 'feels like', 'felt air temperature', 'real feel', or 'apparent temperature', is what the temperature feels like to the human body when the air temperature is combined with the relative humidity. This effect is subjective, depending on the activity and individual's heat perception influenced by various reasons (metabolic differences, differences in body mass, height, and shape, pregnancy). 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. Children are often less aware of the need to rest and re-hydrate. Thirst is a late sign of dehydration - it is vital to remain hydrated, particularly during prolonged physical activities.

Humidity

In December, the average relative humidity is 83%.

Rainfall

In Cozumel, it is raining for 9.8 days, with typically 106.8mm (4.2") of accumulated precipitation. In Cozumel, during the entire year, the rain falls for 119.9 days and collects up to 1489.9mm (58.7") 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

The month with the shortest days is December, with an average of 10.9h of daylight.

Sunshine

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

UV index

Months with the lowest UV index are January and December, with an average maximum UV index of 7. A UV Index reading of 6 to 7 represents a high threat to health from the exposure to the Sun's UV rays for the ordinary person.
Note: The average daily UV index of 7 in December transform into the following instructions:
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 strength of the UV rays is significantly increased by the reflection of the water and sand.

What is the coldest month in Cozumel?

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

What is the temperature in December in Cozumel?

In December, 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. 'real feel', 'feels like'), that combines relative humidity and air temperature, is estimated at 34.2°C (93.6°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 December, the rain falls for 9.8 days. Throughout December, 106.8mm (4.2") of precipitation is accumulated.

What is the water temperature in December in Cozumel?

In Cozumel, Mexico, in December, the average water temperature is 27°C (80.6°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 Cozumel?

The month with the shortest days is December, with an average of 10.9h of daylight.

How many hours of daylight does Cozumel have in December?

In December, the average length of the day in Cozumel, Mexico, is 10.9h.

How long on average sun shines in December in Cozumel?

The average sunshine in December is 6.2h.

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

Months with the lowest UV index are January and December, with an average maximum UV index of 7.

How high is the UV index in December in Cozumel?

In December, the average daily maximum UV index is 7. A UV Index value of 6 to 7 symbolizes a high health risk from unsafe exposure to the Sun's UV rays.
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).
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).
Coldest months (with the lowest average low temperature) are January and February (19.4°C).

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

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

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 lowest rainfall) is March (32.2mm).

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 lowest number of rainy days is April (3.7 days).

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

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

Average daylight in December / Average sunshine in December - Cozumel, Mexico
  • Average daylight in December: 10.9h

The month with the longest days is June (Average daylight: 13.4h).
The month with shortest days is December (Average daylight: 10.9h).

  • Average sunshine in December: 6.2h

The month with most sunshine is April (Average sunshine: 8.6h).
Months with least sunshine are September and November (Average sunshine: 6.1).

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

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