April weather forecast
Cozumel, Mexico

April, the same as March, in Cozumel, Mexico, is another tropical spring month, with an average temperature ranging between max 32°C (89.6°F) and min 21.8°C (71.2°F).
The perfect water temperature of 27°C (80.6°F) with 45mm (1.77") of accumulated rainfall and only 3.7 rainfall days, makes April a great period for swimming and other water activities.

Temperature

In April, the average high-temperature in Cozumel, Mexico, is almost the same as in March - a still hot 32°C (89.6°F). In April, in Cozumel, the average low-temperature is 21.8°C (71.2°F).

Heat index

In April, the average heat index is appraised at an extremely hot 44°C (111.2°F). Beware: Heat cramps and heat exhaustion are very likely. Heatstroke is imminent with prolonged activity.
Note that heat index values are valued for light wind and location in the shade. With exposure to direct sunlight, the heat index may be increased by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature', 'feels like', 'apparent temperature', or 'real feel', is an index that combines air temperature and relative humidity to determine the human-perceived temperature equivalent. Additional factors like clothing, wind, metabolic differences, and activity influence one's weather impression. 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.
The human body cools itself through perspiration, as excessive warmth is removed from the body through sweat evaporation. 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

March and April, with an average relative humidity of 79%, are the least humid months in Cozumel, Mexico.

Rainfall

In April, in Cozumel, the rain falls for 3.7 days. Throughout April, 45mm (1.77") of precipitation is accumulated. In Cozumel, Mexico, 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 water temperature 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 average length of the day in April is 12h and 38min.
On the first day of April in Cozumel, sunrise is at 6:40 am and sunset at 7:02 pm. On the last day of the month, sunrise is at 6:18 am and sunset at 7:11 pm EST.

Sunshine

April has the most sunshine of the year, with an average of 8.6h of sunshine.

UV index

The months with the highest UV index are April through August, with an average maximum UV index of 12. A UV Index value of 11, and more, symbolizes an extreme threat to health from exposure to the Sun's UV radiation for the ordinary person.
Note: The daily maximum UV index of 12 in April interpret into the following advice:
Take all required precautions, as unprotected skin and eyes can burn in 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. 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. Beware! The reflection of water and sand dramatically increases exposure to the UV rays.