Is the sea water cold in Portugal?

The graph below shows the range of monthly Lisbon water temperature derived from many years of historical sea surface temperature data. The warmest water temperature is in September with an average around 67.8°F / 19.9°C. The coldest month is March with an average water temperature of 59°F / 15.0°C.



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The most famous are in the Algarve. With three thousand hours of sun per year and warm waters, there are beaches along its 200km length to suit every taste and many dreamlike resorts.

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In fact, the waters of Portugal's coasts are rather cold compared to those of the Mediterranean Sea. A period of mental and physical preparation is necessary to enjoy a swim in the waters of the beaches of Portugal. However, there are some places where the temperature of the water is warmer and warmer.

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Portugal's beaches are beautiful, yes–but due to being set on the Atlantic, the water is actually much colder than many visitors might expect (yes, even in the Algarve). What is this? Spain's long Mediterranean coast, on the other hand, tends to offer much warmer water and a longer swimming season.

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The high season – June to August – is the best time for the beach. During the summer months, you'll find warmer ocean temperatures, especially as you head south to the Algarve. Water temps and crowds alike peak in July and August, so plan on sharing those pretty beaches with plenty of other sunseekers.

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The Algarve is one of the sunniest regions of Europe. With a warm climate and over 300 days of sunshine a year, you can enjoy a great holiday throughout the year. If you are looking for a beach holiday, then the Algarve is the perfection destination. You can swim in the ocean comfortably from March until October.

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The warmest water temperature is in August with an average around 71.1°F / 21.7°C. The coldest month is March with an average water temperature of 61°F / 16.1°C.

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The graph below shows the range of monthly Albufeira water temperature derived from many years of historical sea surface temperature data. The warmest water temperature is in September with an average around 70°F / 21.1°C. The coldest month is March with an average water temperature of 60.6°F / 15.9°C.

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Tsunamis in Portugal are comparatively rare, but still possible due to the country's geographical location on the western edge of the Iberian Peninsula. They usually occur due to seismic activity in the Atlantic Ocean.

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The warmest part of the Algarve is the eastern Algarve. The more west you travel, the colder and windier it usually gets, especially ones you go around the corner at Sagres. I would recommend staying anywhere in between the Spanish boarder and Salema.

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You can find all the sea temperatures for Portugal there. The statistics on that website show that the sea off Figueira da Foz has a maximum ocean temperature of 21.3°C / 70.4°F in August; that should offer comfortable bathing for almost all.

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Whether you have an upcoming trip booked or are looking for travel inspiration, keep scrolling to see the best beaches in Portugal.
  • Praia Dona Ana, Lagos.
  • Costa da Caparica, Almada.
  • Praia Porto Santo, Porto Santo Island.
  • Praia de Moledo, Moledo.
  • Praia da Falesia, Albufeira.
  • Praia de São Jacinto, Aveiro.


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Some days in the month are still likely to be warm enough for sunbathing on the south coast and (if you're brave and don't mind the chilly water) swimming.

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Temperatures also drop both day (17C) and night (8C), so do remember to bring some warm clothes for the cooler nights. Given the change in climate, Albufeira is not a winter sun/beach destination.

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Praia dos Coelhos, Sétubal The setting for innumerable films and advertising campaigns, this idyllic, secluded beach on the Arrábida coastline boasts some of the clearest waters you'll likely ever swim in. Though increasingly on the tourist trail, it's still relatively crowd-free.

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