January weather forecast
Cozumel, Mexico

The start of the year in Cozumel, Mexico is characterized by a gentle rise in temperatures from the cooler winter months. Moderate humidity and an increase in rainfall contribute to a balmy climate. Daylight lasts slightly over 11 hours, providing ample time for outdoor activities. A UV index of 7 indicates a need for precautions against sun damage especially during midday. Besides, January stands apart due to extremely high total rainfall, where it reaches up to 81mm (3.19").

Temperature

Cozumel's coldest months, January and December, record an average high-temperature of 28.6°C (83.5°F).

Heat index

The heat index value during January is computed to be a tropical 34°C (93.2°F). Special measures are necessary to avoid heat cramps and heat exhaustion. Persistent activity could result in heatstroke.
Be advised, the heat index considers values for conditions in shade and with a light breeze. Heat index values can rise by 15 Fahrenheit (8 Celsius) degrees when in direct sunlight.
Note: The heat index, also known as 'feels like' or 'real feel', is found by incorporating humidity levels into the air temperature measurement. The impression of weather on a person can be swayed by additional aspects, including metabolic variations, pregnancy, and activity levels. Realize that direct exposure to sunlight can augment the felt heat, leading to a potential increase in the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are extremely significant for children. Youths are typically more endangered than adults since they usually sweat less. Their larger skin surface concerning their smaller bodies and higher heat production due to activity further adds to their vulnerability.

Humidity

In January, the average relative humidity is 82%.

Rainfall

In Cozumel, in January, it is raining for 8.7 days, with typically 81mm (3.19") of accumulated precipitation. Throughout the year, there are 119.9 rainfall days, and 1490mm (58.66") of precipitation is accumulated.

Sea temperature

In January, the average sea temperature is 27°C (80.6°F).
Note: Water surface temperatures from 25°C (77°F) to 29°C (84.2°F) are considered optimal and extremely delightful for long-lasting pleasure in any water activity.

Daylight

The average length of the day in January is 11h and 4min.
On the first day of January, sunrise is at 7:23 am and sunset at 6:18 pm. On the last day of the month, sunrise is at 7:23 am and sunset at 6:38 pm EST.

Sunshine

The average sunshine in January is 6.4h.

UV index

January and December, with an average maximum UV index of 7, are months with the lowest UV index. A UV Index reading of 6 to 7 represents a high health vulnerability from unprotected exposure to Sun's UV rays for the ordinary person.
Note: A daily high UV index of 7 in January leads to these guidelines:
Deflect overexposure. Sun protection is a necessity. Remember that UV radiation from the Sun is strongest between 10 a.m. and 4 p.m. Make an effort to limit direct sun exposure during this time. In bright sunlight, prioritize sunglasses that grant protection from UVA and UVB radiation. Beware! The strength of the UV rays is significantly increased by the reflection of the water and sand.