Water temperature of the Adriatic Sea in september Where to swim in the Adriatic Sea in september 2025?

Several countries border the seaside of the Adriatic Sea, including: Albania, Bosnia And Herzegovina, Corfu Island, Croatia, Croatian islands, Italy, Montenegro and Slovenia. 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 74°F and 78°F. The lowest sea temperature measured this month is 69°F and the highest is 83°F.

The sea temperature map of the Adriatic Sea in september

The map below presents a monthly average of the water temperature of the Adriatic Sea 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.