In September sea water temperature all along the Gulf of America (Gulf of Mexico) coast warms above 68°F and it is enough for a comfortable bathing. The warmest average Gulf of Mexico water temperature in September is 86°F (in Murray Key, FL, United States), and the coldest sea surface temperature is 82.8°F (in Mandeville, LA, United States). To find out the sea temperature today and in the coming days, go to Current sea temperature of the Gulf of America (Gulf of Mexico)
This data on the average monthly surface water temperature on the Gulf of America (Gulf of Mexico) coast in September. To see the details, select the country and then the city of your interest. Besides water temperature, you can also get information about the weather for today, tomorrow and the upcoming days, surf forecast, as well as the data on sunrise/sunset and moonrise/moonset at a given point on any given day.
Map shows the average water temperature in September for cities along the Gulf of America (Gulf of Mexico)