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.
Sea Temperature in Cancun. Current water temperature in Cancun is 30 degrees celsius which is third warmest location in Mexico. The warmest water in Mexico is in Acapulco where sea surface has 31 Â°C. This means water is 1 degrees colder than in Acapulco.