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.
An aerial view of the hotels and beaches of Cancun, Mexico taken by droneplcr. Dry season. During the dry season, average temperatures range from lows of 23Â°C/73Â°F in January and February (the coldest months of the year) up to highs of 26Â°C/79Â°F in April.