DAILY CLIMATE REPORT - issued daily: Detailed daily weather statistics (usually for yesterday), including temperature, precipitation, degree days, wind, humidity, sunrise/sunset, and record temperature data for the following day.
In Costa Rica the average annual temperature is around 21 to 27 degrees Celsius or 70 to 81 degrees Fahrenheit and the coolest months of the year are November, December and January. The months March through May are the hottest months of the year, so make sure you protect yourself from the sun.
Rest assured, Cancun will be warm at night and hot during the day by mid May and into June. Temps will likely average in the mid eighties(80's F) and reach into the 90+ F degree range, particularly towards the end of the month. Sunbathing and tanning will be of little worry for those looking for balmy tropical weather to do such.