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.
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.
The Portuguese coastline – along with the coastlines of California, South Africa, Western Australia and Peru – is subject to a phenomenon known as upwelling. In simple terms, if the wind blows parallel to the coast, then water from the bottom of the ocean (cold and rich in nutrients) rises and comes to the shoreline.
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.
Algarve is the hottest region of Portugal, with the exception of Madeira Island (an archipelago of Portugal). In the Alentejo region the average temperatures are around 16ºC (depending on if you are on the coast or in the interior) and in the Algarve region 18ºC.
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.
The average temperature in Europe is 21.8°C. The highest current temperature on the continent according to our data, is in Koper (Slovenia) where water has 28.9 degrees celsius. On the other hand the lowest temperature is in Dalatangi (Iceland) where water has 12.1 degrees celsius.
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.
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. And in the winter months, you can take long refreshing beach walks.
The Algarve region in the south of Portugal is the most popular tourist destination due to its higher temperatures year-round than the north. You can expect a high average of 29 °C in the height of summer and an average of 26 °C throughout this season.
Foz do Arelho lagoon beachThe ocean side is windy and can have big waves, so it's no wonder that it's a well known spot for surf, bodyboard and windsurf.