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 water temperature monthly: Water temperature Cancun in January Water temperature Cancun in February Water temperature Cancun in March Water temperature Cancun in April Water temperature Cancun in May Water temperature Cancun in June Water temperature Cancun in July Water temperature Cancun in August Water temperature Cancun in September