Mediterranean sea temperature, month by month.
The month matters. So does the coast. A sourced guide to the swimming year, without pretending that Mallorca, Málaga and Cyprus share one water temperature.
For a Mediterranean holiday built around warmer seawater, start by comparing July, August and September. May is a different proposition, and October depends heavily on the coast. In AEMET's historical offshore examples below, August has the highest monthly median, while September is warmer than June at both locations.
A sunny afternoon tells you surprisingly little about the swim. Choose your month from climate data, then check local sea conditions close to departure. Neither can promise what the water will feel like to you.
Mediterranean sea temperature by month: the table
These are two western Mediterranean examples, not a temperature range for the entire sea. The first point is west of the Balearic Islands; the second is in the Alborán Sea, south of Spain. Both come from the same AEMET atlas and reference period, making their seasonal patterns comparable.
| Month | West of the Balearics | Alborán Sea |
|---|---|---|
| January | ≈14°C | ≈15°C |
| February | ≈13°C | ≈15°C |
| March | ≈14°C | ≈15°C |
| April | ≈15°C | ≈16°C |
| May | ≈18°C | ≈18°C |
| June | ≈22°C | ≈20°C |
| July | ≈25°C | ≈23°C |
| August | ≈26°C | ≈24°C |
| September | ≈24°C | ≈23°C |
| October | ≈22°C | ≈20°C |
| November | ≈18°C | ≈18°C |
| December | ≈15°C | ≈16°C |
The atlas uses medians: the middle of the historical distribution for each month. We have rounded readings from its charts, not calculated new averages. These offshore points cannot resolve a sheltered cove, the shallows by your hotel or a cold spell during your particular week.
January to April: sunshine is ahead of the water
The table's winter and early-spring values sit well below summer levels. That does not mean nobody swims; it means a winter dip and a warm-water beach holiday are different plans.
The eastern Mediterranean needs its own context. Cyprus's tourism ministry reports open-sea averages of 16–17°C in January–March. That guidance is island-wide and does not state a reference period. It is not another column from AEMET's dataset.
If swimming is the main reason for travelling at this time, compare the Canaries, Madeira and winter alternatives. If you would be equally happy walking along the waterfront, you have much more freedom.
May and June: a warming sea, not an opening date
May's approximate median is 18°C at both western points. By June, the Balearic example is around 22°C and the Alborán example around 20°C. The difference matters more than calling both trips “Mediterranean summer”.
Further east, an older Turkish meteorological-service report lists Antalya's historical monthly means as 20.1°C in May and 23.2°C in June. It was published in 2004 and gives 33 observation years without the sea series' exact start and end dates beside the table. It illustrates the seasonal rise; it is not a current climate normal.
None of these monthly figures tells us that a beach reaches a particular temperature on 15 June. For the booking decision, read when the Mediterranean gets warm enough to swim.
July to September: the strongest starting point for warmer water
Both western examples peak in August: roughly 26°C west of the Balearics and 24°C in the Alborán Sea. September remains warmer than June at both points. That is a useful reason to compare an autumn departure before automatically choosing early summer.
For an eastern option, Cyprus's ministry gives about 27°C offshore in August. Our warmest-sea guide puts that alongside other seasonal choices. It is a shortlist, not a claim that one island wins every day.
Recent summers can depart substantially from historical conditions. Copernicus's account of the European ocean in 2024 documents exceptional Mediterranean warmth and marine heatwaves. A basin-wide record should never be presented as the temperature at a particular beach, or as a reason to expect the same next year.
October to December: compare the coast before the hotel
October's medians are approximately 22°C at the Balearic point and 20°C at the Alborán point. By December, both have cooled considerably. Cyprus's ministry describes a longer warm-water season, with open-sea temperatures above 22°C from June through November, but that broad guidance still needs a local check.
For an October trip, start with Paphos if warmer water is a priority, then compare the actual forecast and your pool options. Do not assume that every Mediterranean resort offers the same autumn swim.
Before you book a swimming holiday
Choose a coast and month first; choose a hotel second. If you need a warm pool as a fallback, ask whether it will be heated during your dates and to what temperature. “Pool available” does not answer either question.
For Spanish beaches, check AEMET's local beach forecasts near departure. Sea temperature alone does not describe waves, currents or safe access. RNLI's swimming guidance is a better starting point for safety than a travel site's temperature table.
Our destination pages show weather forecasts, not live sea-temperature measurements. Use them for the air, rain and wind outlook, then check the water separately.