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.
Spring Weather in Cancun. Spring is mid-way through the dry season in Cancun. Temperatures rise up to average highs of 32Â°C (90Â°F) in April, falling to 23Â°C (73Â°F) at night. The difference between the daytime and night time temperatures is fairly large and only increases as the months develop.