The sea temperatures around Lisbon rarely go over 20°C in the peak of the summer and more realistically, you'll likely get something in the 17-19°C range. That is cold for most people.
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Portugal Weather in JuneThe average June high is 23°C, with a low of 16°C. Despite warm air temperatures, ocean waters will still be too cool for long swimming.
The weather in JunePerfect for warm salty beach days with balmy evenings on the terrace. The sea can still be quite chilly but can reach up to 19 degrees which is doable. The prefect temperatures for water sports. However, June is not the best time for surfing on the Algarve south coast.
June to August is the best time for perfect weatherThe Algarve sizzles during high season, encouraging days of lounging on the beach followed by refreshing dips in the ocean (cold Atlantic currents mean that the sea never gets quite as warm as it does in the Mediterranean).
The Best Way to Enjoy the Lisbon BeachesBeach season officially starts at the beginning of June, but the warm weather typically comes sooner. The water might be too cold for a dip and most beaches don't have lifeguards working before the season starts, but you can still go for some sunbathing.
You can swim in the ocean comfortably from March until October. And in the winter months, you can take long refreshing beach walks. Find out what the weather in the Algarve is like from January until December.
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.
As to further north like Porto and Braga, it will be busier than winter, but not as bad as further south. As to the timing, yes, June is one of the best months to visit. Realistically it is a always busy, portugal is actually one of the busiest destinations in Europe.
But though Nazaré's surfing reputation precedes it, there are plenty of calmer beaches suitable for swimming, including Praia da Nazaré and São Martinho do Porto.
The climate in Portugal is relatively comfortable. It is very suitable for tourism in all four seasons. It is relatively warm from April to October. The peak period of tourism is from mid-June to the end of September.
Portugal Weather in JuneBeing the tail end of the spring shoulder season in Portugal, June sees dry and sunny days throughout the month. With an average minimum of 16°C and an average high of 25°C, Lisbon is particularly pleasant at this time of the year.
Lisbon is the busiest area of Portugal in June, however there are fewer tourists than in July and August. This is a great month for sightseeing, as while the weather will be hot, it won't be intensely draining.