I don't think you can make any general assumptions about the ocean as something like that will change depending on the weather systems that frequently blow through the area.
June IS the beginning of hurricane season and if there's any kind of tropical disturbance passing by, well, you can forget the calm water!
I also believe it's the luck of the draw but I will say that the Lindo is not known to have the calmest water compared to some of the other resorts in Riviera Maya...mostly.
