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

Cozumel's shift from April to May is accompanied by an average high-temperature of a still hot 32.7°C (90.9°F), a slight deviation from 32°C (89.6°F). Cozumel's temperature in May lowers to a consistent average of 22.9°C (73.2°F) during the nights.

Heat index

May's average heat index is computed to be a burning hot 47°C (116.6°F). Keep on guard: Heat exhaustion and heat cramps are probable. Heatstroke is a possible danger with ongoing physical activity.
Records show heat index calculations are tailored for shaded regions and mild winds. The heat index may scale up by 15 Fahrenheit (8 Celsius) degrees with direct sun exposure.
Note: The heat index, also known as 'felt air temperature' or 'apparent temperature', is what the temperature feels like to the human body when the air temperature is combined with the relative humidity. The effect is personal, with varied weather perceptions among individuals due to differences in body mass, stature, and physical activity. One's exposure to direct sunlight has the potential to intensify the heat sensation, increasing the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly meaningful for babies and toddlers. Children commonly overlook the importance of rest and fluid replenishment. Thirst, being a delayed sign of dehydration, emphasizes the need to keep hydration up, especially during lengthy physical activities.
The body's natural response to excessive warmth is perspiration, as it allows for cooling through sweat evaporation. A higher relative humidity affects normal body cooling by reducing the evaporation rate, subsequently lowering the rate at which the body cools and increasing the perception of heat. When the body's heat gain surpasses its removal capacity, body temperature starts to climb, leading to potential heat-related ailments.

Humidity

In May, the average relative humidity is 80%.

Rainfall

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

Sea temperature

In Cozumel, in May, the average water temperature is 28°C (82.4°F).
Note: Water temperatures from 25°C (77°F) to 29°C (84.2°F) make swimming, diving, and similar activities highly pleasurable and enjoyable for long periods without discomfort.

Daylight

In May, the average length of the day 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, sunrise is at 6:06 am and sunset at 7:24 pm EST.

Sunshine

In May, the average sunshine is 7.5h.

UV index

April through August, with an average maximum UV index of 12, are months with the highest UV index. A UV Index reading of 11, and higher, represents an extreme threat to health from exposure to the Sun's UV radiation for the ordinary person.
Note: A daily high UV index of 12 in May leads to these guidelines:
Put into action all crucial precautions. Defense against sun damage is a must. Limit direct sun exposure especially between 10 a.m. and 4 p.m., when UV radiation is at its peak. However, keep in mind that shade structures may not provide full sun protection. A hat with a generous brim can prevent nearly 50% of UV rays from reaching your eyes. Despite the clouds, sunscreen with an SPF of at least 30 should be used liberally and reapplied frequently, especially after a swim or outdoor workout. Attention! The combination of sand and water reflections enhances UV ray intensity.