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.
According to our data for the last three years for Cancun the highest average sea water temperature was in August, September and July. The average sea surface temperature in August 2017 for Cancun was 89.3Â°F. The maximum and minimum values were 88.4Â°F and 90.4Â°F respectively. Sea Water Temperature in September