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.
Weekly Weather Report for Cancun, Mexico. Looking at the weather in Cancun, Mexico over the next 7 days, the maximum temperature will be 27â (or 81â) on Thursday 13th April at around 1 pm. In the same week the minimum temperature will be 18â (or 65â) on Tuesday 18th April at around 10 pm.