Water temperature of the Gulf of Mexico in september Where to swim in the Gulf of Mexico in september 2025?
Several countries border the seaside of the Gulf of Mexico, including: Cuba, United States, Florida, Louisiana and Mexico. We measure the water temperature daily in these countries and archive it in order to calculate monthly averages, like those of the month of september.
Several countries border the seaside of the Gulf of Mexico, including: Cuba, United States, Florida, Louisiana and Mexico.
We measure the water temperature daily in these countries and archive it in order to calculate monthly averages, like those of the month of september.
The seasonal average for the water temperature in the month of september is between 83°F and 86°F. The lowest sea temperature measured this month is 79°F and the highest is 90°F.
The sea temperature map of the Gulf of Mexico in september
The map below presents a monthly average of the water temperature of the Gulf of Mexico for the month of september for several coastal cities. You can zoom and move around on the map. By clicking on the markers, you can see sea temperature details by city in september.
ideal swimming 
pleasant swimming 
cool swimming 
cold swimming 
freezing swimmingWhere can you swim in the Gulf of Mexico in september?
Below, see the average temperatures measured in september in the different countries on the shores of the Gulf of Mexico.
Cuba
86°F to 86°F
ideal swimmingUnited States
83°F to 85°F
ideal swimmingFlorida
83°F to 86°F
ideal swimmingLouisiana
83°F to 84°F
ideal swimmingMexico
85°F to 86°F
ideal swimmingWater temperature of the Gulf of Mexico: choose another month
See monthly seasonal averages of the water temperature of the Gulf of Mexico by clicking on the links below: