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 highest day temperature in December 2017 was 86Â°F. The lowest night temperature was 64Â°F. The average values for day and night temperatures during December were 81.1Â°F Ð¸ 75.7Â°F respectivly. Cancun Water Sea Temperature in December, Â°F Select Year: