March weather forecast and climate
Cozumel, Mexico

March, the first month of the spring, in Cozumel, is a tropical month, with average temperature fluctuating between 20.7°C (69.3°F) and 30.9°C (87.6°F).
The ideal sea water temperature of 26°C (78.8°F) and only 4 rainfall days, with 32.2mm (1.27") of accumulated rainfall, makes March the best time for swimming and other water activities.

Temperature

In March, the average high-temperature in Cozumel is practically the same as in February - a tropical 30.9°C (87.6°F). The average low-temperature, in Cozumel, is 20.7°C (69.3°F).

Heat index

In March, the average heat index is estimated at a blistering 40.2°C (104.4°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', 'apparent temperature', or 'felt air temperature', combines air temperature and relative humidity to represent a human perceived temperature equivalent. This effect is individual, with diverse people perceiving weather differently for numerous reasons (pregnancy, wind, differences in body mass, height, and shape), and activity. 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 particularly important for children. 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.
To prevent overheating and help regulate its internal temperature, the human body sweat and rely on the evaporation to cool down. Under high air temperature and humidity (high heat index) conditions, perspiration is limited, and the perception of heat is increased. 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

Months with the lowest humidity in Cozumel, Mexico, are March and April, with an average relative humidity of 79%.

Rainfall

March is the month with the least rainfall in Cozumel. Rain falls for 4 days and accumulates 32.2mm (1.27") of precipitation.

Sea temperature

February and March, with an average sea temperature of 26°C (78.8°F), are months with the coldest seawater in Cozumel.
Note: 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.

Daylight

In Cozumel, the average length of the day in March is 12h.

Sunshine

The average sunshine in March is 7.5h.

UV index

The average daily maximum UV index in Cozumel is 11. A UV Index estimate of 11, and higher, represents an excessive health risk from unprotected exposure to the Sun's UV rays for average individuals.
Note: The daily maximum UV index of 11 interpret into the following advice:
Practice all essential precautions. Protection against sun damage is crucial. 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. A wide-brim hat offers excellent sun protection for eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun. Even on cloudy days, a sunscreen with a minimum 30 sun protection factor should be generously applied and frequently re-applied, including after every swim or outdoor exercise. Caution! The reflection of sand and water significantly increases the intensity of the Sun's UV radiation.