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.
For the correct totals, please visit WeatherBase Cancun ) With the sun shining on average between 240 and 253 days per year, Cancun is a year-round holiday destination, although certain times of year may be more favorable than others. High season for travel falls between December and April. During these months the weather tends to be sunny, with temperatures hovering around 85ÂºF (30ÂºC) during the day and rarely dipping far below 65ÂºF (18ÂºC) at night.