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 gets hit directly by a hurricane approximately every 12 years, and gets at least brushed by a hurricane every 2.5 years. Hurricane season in Cancun runs from July through November, with September and October being the most likely months for a hurricane event. Cancun water temperatures are always bathtub warm, varying from 78F-80F in the winter months to 82F-84F in the summer months.