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.
Weather-Semi-tropical with an average temperature of 80 degrees Fahrenheit. Average daily maximum and minimum temperatures for Cancun: CancÃºn-January, march-68Â°86 (f-20Â°30); C-April, june-71Â°89 (f-22Â°32); C-July, september-75Â°91 (f-24Â°33); C-October, december-68Â°87 (f-20Â°31). c