Our island has its present appearance thanks to a powerful volcanic eruption many years ago. It has created such a great diversity in such a small island: high cliffs neighboring with wide and completely flat coasts. Although the island is small, but it has some very interesting beaches. Moreover, the temperature of the sea in Santorini varies from beach to beach. The reason for this is the earth’s rocks on the surface after the eruption and their colour!

As you know, we have white, red and black beaches, so the sea water temperature can vary considerably from resort to resort. On black beaches the water is slightly warmer: the dark volcanic sand heats up quickly in the bright sunlight, so the sea water temperature rises more quickly in shallow water.

Water temperature in Santorini: sea and beaches this minute

Today is May 27, 2024, and now the water temperature in Santorini averages +19°C...+21°C — that's good enough!

Right now the water temperature in Santorini is about +19°C...+21°C — that's good enough!

The coasts of our island are very diverse: the west coast is high cliffs, and it is almost impossible to talk about any beaches here. The east coast is just the opposite! In every sense 🙂 Smooth coastlines and long, long beaches that start almost at the northernmost point and stretch all the way around the island to the south. In the south there are Red and White Beaches, and the whole east consists entirely of black volcanic rocks, which is where the sea temperature is higher.

Water temperature on the beaches of Santorini on the map:

 

Sea water temperature in Santorini by month

Don’t be surprised by this grouping of months: December can hardly be called a real winter on our island, and May and September are more like a hot and dry summer 🙂

Water temperature in Santorini in winter

During the winter months, the water temperature in the sea naturally drops. All the beaches on the island are not suitable for swimming, especially in February, when the sea can be stormy, but January can still offer the chance – if you’re lucky enough to have sunny days and no wind.

Seashore on the black beach of Kamari, Santorini, Greece
Seashore on the black beach of Kamari, Santorini, Greece

January: the water in the sea continues to cool down

Sea temperature in this month usually stays in the range of +17 … +18 degrees. Water and air temperatures are often the same. The sea is usually a little warmer at the beginning of the month, but cools down towards the end of January – the coldest month.

February: it can’t get any colder

The sea cools down to +16…+17 degrees – that’s cold, especially considering the general environment. On the other hand – it can be even a bit warmer in the water than in the air. An interesting fact about the end of winter on our island 🙂

Sea temperature in Santorini in spring

Spring comes quickly – as early as March. There is more sunshine, the air temperature begins to rise, but the temperature of the water in the sea is usually not immediately affected. But it’s a great time to go for a walk, even by the sea!

Vlychada Black Beach, Santorini, Greece
Vlychada Black Beach, Santorini, Greece

March: the sea in Santorini is getting ready to warm up

In the sea, the temperature typically ranges from +16 to +17 degrees, although it may be higher in certain areas, particularly on certain beaches and in shallow water.

April: the temperature of the sea increases

In April, the number of sunny and warm days increases, and the sea temperature slowly begins to rise. The sea in Santorini reaches temperatures of +17…+18 degrees, sometimes even warmer. There is an increase in temperature during and after this month:

Sea water temperature in Santorini by month
Sea water temperature in Santorini by month

Water temperature in Santorini in summer

Summer starts early on the island, with temperatures rising quickly in late April or early May. The sea also warms up rapidly during this time, and you can feel the difference in just a few weeks.

Black sand at Kamari beach, Santorini, Greece
Black sand at Kamari beach, Santorini, Greece

May: the beginning of the summer heat

In early May, the water temperature in Santorini is typically around +18 to +19 degrees. However, by the second half of the month, the sea on some beaches warms up to +20 to +21 degrees. The beach season in Santorini officially begins in this month.

June: sea, sun, summer

Many locals are accustomed to higher sea temperatures, so the bathing season is opened a little later, usually in the first half of June. During this period, the sea water temperature is typically around +21 to +23 degrees. This is a great combination with the hot weather and bright sun!

July: the sea is very good!

The sea temperature is between +23 and +25 degrees, with the black beaches being noticeably warmer, even at depth, so the bathing season in Santorini is in full swing! The water on the red beach is slightly cooler.

August: the water temperature in the sea is as high as possible

The most comfortable month for swimming, the sea will not get warmer: +25 … +26 degrees on all beaches of Santorini. You can sit in the water for half a day 🙂 The most suitable month for a beach holiday on the island.

September: it’s still summer

We consider this month to be summer: the sun shines brightly, the heat is even in the shade, and the sea water temperature in the sea is at least +24 … +25 degrees! Towards the second half of the month, the sea begins to cool down a little, giving a feeling of a velvet season.

Sea water temperature in Santorini in autumn

The velvet season in Santorini comes in late September and early October. Although the air cools faster than the sea, temperatures are still high here and there.

Red Beach, Santorini, Greece
Red Beach, Santorini, Greece

October: the velvet season in Santorini

In October, the sea water temperature usually cools down to between +21 and +23 degrees. Towards the end of the month, the daytime air temperature is equal to that of the sea water. Generally, bathing in Santorini in October remains comfortable.

November: it is a breath of autumn

In November, the water temperature in Santorini drops to around 20-22 degrees Celsius. Swimming is enjoyable on sunny days. The air temperature is often the same as the sea water temperature. The best time to swim is usually in the first week and a half of the month. Towards the end of the month, it becomes apparent that the bathing season on the island is coming to a close.

December: winter is coming

During this month, the sea is often warmer than the air. Although the water temperature has dropped, it may still be a good idea to walk barefoot along the coast when the sea water temperature is between +18 and +19 degrees and the air temperature is +16 degrees.However, swimming should not be expected.

What can be useful for holidays in Santorini

Are you planning a holiday in Santorini? Or are you already on the island? We are happy to help you organise your vacation! Check out tips, services and offers:

Airplane tickets

If you try SkyScanner or Aviasales, you can find low-cost tickets to Santorini in advance.

Hotels and villas

If you check accomodation in advance, you’ll be pleased with the number of great hotels in Santorini. We also recommend you to pay attention to the selection of our favorite hotels. We stay in many of them ourselves

Transfers

If driving is not your thing, it’s best to arrange a way to get around the island beforehand. Check the bus timetables, compare taxi offers from Kiwitaxi and our transfer options.

Book a car

There are not many cars in the car hire companies, so once again the aggregator service comes in handy: all the options in one place.

Tours and guides

In our online store you can choose and book group or private tours in Santorini in advance.


Santorinika

Santorini Travel Agency: group excursions and boat trips, private guides and individual itineraries, helicopter aerial excursions, yacht and catamaran rentals - everything you may need for your vacation in Santorini!