Effects of high humidity. Humidity is considered too high when its level goes above 45% - 50%, sometimes as high as 80% and up. High humidity can be especially dangerous when combined with high temperature - as mentioned above, high humidity disrupts the body's ability to cool itself, which may lead to a heat stroke.
The average sea surface temperature in April 2017 for Cancun was 84.0Â°F. The maximum and minimum values were 83.0Â°F and 85.4Â°F respectively.
Cancun current water temperature is: 85Â°F. In the summer months in Cancun the ocean temperatures around Cancun rise to an average of 84 fahrenheit and do reach 86 in some areas. This makes Cancun the ideal place for enjoying great water sports activities such as diving, water skiing, boating, swimming and taking trips out on speed boats.