As can be expected, average water temperatures in Miami Beach are highest during the summer and cool as the winter progresses. Thermoclines can occur, but are more common during the winter months and are usually experienced in deeper waters.
Average water temperatures in Miami Beach are always warm in comparison to New England or West Coast water, ranging from a very warm 80'F - 85'F (May - October ) to a cooler 72'F - 79'F (Nov - April). The warmest water can always be found in the middle of August, and the coolest usually by mid-February.
The breathtaking color of the water is what attracts many visitors to Miami Beach. It is here that the Atlantic waters mix with Caribbean waters, giving our coastline its well known palette of blues and greens.
The water visibility of Miami Beach will vary depending on atmospheric conditions (storms, high winds, rain) and man-made elements (stormwater runoff, coastal pollution) that can effect turbidity. You can expect to find that average visibility is 30 - 50 feet year round, making diving and snorkeling a fantastic outdoor activity throughout the year. The reefs in Miami Beach sit in around 20 - 35 ft. of water.