May weather forecast
Cozumel, Mexico

Shifting towards May results in warmer temperatures and an increase in relative humidity as the dry season persists. Most days are sunlit and long, creating suitable conditions for sightseeing and exploring Cozumel. A high UV index of 12 advises caution when outdoors between sunup and sundown. However, the weather in May starts to break the dry spell with a relatively high recorded rainfall of 111mm (4.37"). Nevertheless, the changes don't disrupt the increasing sea temperature, which tops 28°C (82.4°F).

Temperature

May brings a marginal elevation to a still hot 32.7°C (90.9°F) from April's 32°C (89.6°F) in Cozumel's average high-temperatures. Cozumel, in May, witnesses an average low-temperature of 22.9°C (73.2°F).

Heat index

The heat index in May is calculated to be a life-threatening hot 47°C (116.6°F). Note: Heat exhaustion and heat cramps are probable. Heatstroke can follow with prolonged activity.
Know that the heat index computations account for shaded terrains and slight winds. The heat index might be elevated by 15 Fahrenheit (8 Celsius) degrees due to direct sun exposure.
Note: The heat index, also known as 'apparent temperature' or 'felt air temperature', is a calculated temperature value of how hot it feels when the moisture in the air is factored in. Physical activity, clothing, and metabolic variations are additional factors that impact an individual's perception of temperature. Direct sun rays can make one feel hotter, potentially raising the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are extremely significant 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.
Sweat evaporation, driven by perspiration, is the method the human body uses to rid itself of excessive warmth. In the presence of abundant moisture in the atmosphere, the cooling process through evaporation is hindered, causing the body to feel excessively warm. Elevated heat gain compared to the body's release capability poses risks of dehydration and potential overheating.

Humidity

In May, the average relative humidity in Cozumel, Mexico, is 80%.

Rainfall

In Cozumel, Mexico, during May, the rain falls for 7.2 days and regularly aggregates up to 111mm (4.37") of precipitation. Throughout the year, there are 119.9 rainfall days, and 1490mm (58.66") of precipitation is accumulated.

Sea temperature

In Cozumel, Mexico, the average seawater temperature in May is 28°C (82.4°F).
Note: Engaging in water activities, such as swimming or diving, in temperatures from 25°C (77°F) to 29°C (84.2°F) is very pleasurable for extended periods, without any discomfort.

Daylight

In May, the average length of the day in Cozumel is 13h and 7min.
On the first day of the month, sunrise is at 6:17 am and sunset at 7:12 pm. On the last day of May, in Cozumel, Mexico, sunrise is at 6:06 am and sunset at 7:24 pm EST.

Sunshine

The average sunshine in May in Cozumel is 7.5h.

UV index

The months with the highest UV index are April through August, with an average maximum UV index of 12. A UV Index of 11, and more, symbolizes an extreme health hazard from unsafe exposure to UV radiation for average individuals.
Note: The maximum daily UV index of 12 in May converts into the following recommendations:
Enforce every key safety measure. Those with light skin might get burns in a matter of minutes. Avoid direct Sun exposure and stay in the shade between 10 a.m. and 4 p.m., a time when UV radiation is most intense, noting that not all shade structures offer full protection. Sun-related eye harm can be minimized with proper sunglasses offering UVA and UVB coverage. One should apply and reapply liberally a broad-spectrum sunscreen of SPF 30+ every two hours and immediately after a swim or an outdoor exercise. Be careful! The Sun's UV radiation is accentuated by reflecting off sand and water.