Florida's Ocean Temperatures in Summer

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The tables below give the monthly averages for ocean temperatures at Florida beaches in degrees Fahrenheit and degrees Celsius for June, July and August. The list of beaches runs from south to north along the Atlantic Ocean and the Gulf of Mexico.

Just about anywhere in Florida, the ocean usually stays above 80 °F (27 °C) throughout summer. All along the entire Florida Gulf Coast the water's consistently warm, with temperatures varying by only one or two degrees from beach to beach.

Water at the warmest beaches — Key West and Naples — averages 87 °F (31 °C) when the temperature peaks in July and August. That's the hottest ocean water to be found anywhere at any time in the United States.

Typically during summer the Atlantic Ocean off Florida stays a few degrees cooler than the Gulf of Mexico.


Florida's average ocean temperature in °F
June July August
Atlantic Ocean  
Miami Beach 85 86 85
Stuart Beach 79 79 80
Daytona Beach 80 80 81
St Augustine Beach 81 84 83
Fernandina Beach 81 84 84
Gulf of Mexico  
Key West 85 87 87
Naples 86 87 87
St. Petersburg 84 86 86
Cedar Key 84 86 86
Pensacola 84 85 86

Average water temperature at Florida beaches in °C
June July August
Atlantic Ocean  
Miami Beach 29 30 29
Stuart Beach 26 26 27
Daytona Beach 27 27 27
St Augustine Beach 27 29 28
Fernandina Beach 27 29 29
Gulf of Mexico  
Key West 29 31 31
Naples 30 31 31
St. Petersburg 29 30 30
Cedar Key 29 30 30
Pensacola 29 29 30
Reference

National Oceanographic Data Center. NODC Coastal Water Temperature Guide (CWTG).

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