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.
The wet season in Cancun is much hotter than the dry season, primarily due to the increased humidity caused by intense rainfall. During this season, average temperatures range from 27Â°C (81Â°F) in May up to of 28Â°C (82Â°F) in June, July, August and September.