In Cozumel how hot does it normally get daily and at night?
Depends when you are going..The summers are hot and humid..Will probably be more bugs than usual because of all the water..Bring the basics and you will be fine..That is,a hat,sunscreen,and for adults,repellant with 100% Deet..And dont be freaked out by the weather forecasts for rain everyday..Unless there is a major storm. the rain is usually hit and run..Not long lasting..
It is the tropics and the summers are hot, that is the way it is. Temp is around 90 F, but with the high humidity , the heat index is around 105 F . You just learn to adjust by staying in the shade or the pool or ocean, drinking lots of water etc.