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.
Other places with similar sea surface temperature: Current water temperature in Cancun is 27 degrees celsius which is third warmest location in Mexico. The warmest water in Mexico is in Acapulco where sea surface has 27 Â°C. This means water is 0 degrees colder than in Acapulco. Among 56 towns in continent Central America, Cancun has 26th warmest water.