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 heat index is kind of like wind chill in reverse, high humidity makes high temperatures âfeelâ even hotter than they really are. By now, the hotel pool will be considerably warmer than the ocean, and it will stay that way until around October or November. Average April Cancun Weather Stats