Where to go for a beach holiday in September
September keeps much of the Mediterranean's summer warmth in the water. Mallorca, Rhodes and southern Turkey remain strong swimming comparisons, while the northern Adriatic begins cooling from its summer peak. This makes September worth considering for a holiday that combines swimming with time in coastal towns.
Summer water, a changing season
Lindos on Rhodes and Rovinj illustrate why the particular coast still matters. Look at both destinations' averages rather than treating September as one uniform Mediterranean season. For an island stay, check the ferry timetable and services for your exact week, particularly later in the month. Caribbean water is also very warm, but September falls around the climatological peak of the Atlantic hurricane season. The highest sea temperature alone should not decide between a Mediterranean break and a tropical journey.
World coasts
°CComparison: September
2021–2025 sea temperature averages for the named places, not entire regions. Not a forecast.
The tiles compare monthly sea and air averages for 2021–2025. The selection includes beaches with an average sea temperature of at least 18 °C; it is not a forecast for a particular week or a guarantee of comfortable swimming.
Where is hot in September · September average
2021–2025 sea temperature averages for the named places, not entire regions. Not a forecast.