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Sea temperature in Portugal in May
17°Cmild · monthly average
The sea around Portugal averages 17°C in May. Cool — best for confident swimmers or short dips.
Monthly sea temperatures across the year
Best swim months
—
Warmest month
August (21°C)
Coolest month
February (14°C)
Best beaches in Portugal
Algarve
Praia da Falésia
Six-km cliff-backed orange-sand beach.
Algarve
Praia da Rocha
Wide town beach beneath sandstone cliffs.
Algarve
Praia de Benagil
Sea-cave beach famous for its skylight cathedral.
Algarve
Praia da Luz
Sheltered family bay west of Lagos.
Algarve
Praia Dona Ana
Postcard sandstone-stack beach.
Algarve
Praia de Tavira
Wide barrier-island beach reached by ferry.
Algarve
Meia Praia
Four-km flat Lagos beach.
Algarve
Praia do Carvoeiro
Town beach hemmed by cliffs.
Algarve
Praia da Marinha
Iconic limestone cliffs and turquoise water.