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.
Cancun weather in April is getting very nice indeed and you will know summer is just around the corner. Average daily high temperatures are just under ninety at 89F, on 3 of April's 30 days temperatures will rise above 90 in a typical month with every other day exceeding eighty degrees.pril is the ideal time to explore the scenic beauty in and around Cancun. Maybe try a snorkeling trip over the reef at Puerto Morelos or take a day trip to one of the nearby eco parks such as Xcaret or Xel Ha.