The coolest period in Cancun is in January to February with temperatures averaging 73 fahrenheit. Temperatures tend not to drop greatly under 68 fahrenheit at nighttime. The warmest time in Cancun with temperatures while in the mid-80s is about June and July. You will find there's forecast of water temperature https://cancun-weather76420.blogprodesign.com/53654378/fascination-about-cancun-weather