Average Ocean Water Temperatures at Naples
The table below lists typical water temperatures for each month of the year in the ocean off Naples in Florida. The water reaches its warmest point of the year in July and August when the temperature averages 87 degrees Fahrenheit (31 degrees Celsius).
The coolest time is January and February, when the temperature usually drops to around 66 °F (19 °C).
The water at Naples remains a comfortable swimming temperature, typically above 70 °F (21 °C), from March to November.
National Oceanographic Data Center. NODC Coastal Water Temperature Guide (CWTG).