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Sea temperature in Portugal

Live water temperatures and swimming conditions across 204 beaches on the Portugal coast.

Best time to swim in Portugal

The sea in Portugal peaks in August, when the water averages around 21°C.

The main swimming season runs from July – September, when surface temperatures stay comfortable for extended sessions.

On average, 3 months a year sit above 20°C — the threshold most swimmers describe as pleasant without a wetsuit.

Shoulder months like June and October are noticeably cooler but often quieter, with fewer crowds and steadier weather.

Outside peak season the water drops toward 14°C, so a 3/2mm shorty or full wetsuit makes long swims much more comfortable.

The coldest month is typically February at around 14°C, when cold-water swimmers dominate the coast.

Portugal sea temperature history

Long-term climatology for Portugal shows an annual mean sea temperature of 18°C, ranging from 14°C in winter to 21°C at the summer peak.

The seasonal swing is roughly 7°C between the coldest and warmest month — a useful yardstick when comparing years or checking whether the current sea is running above or below average.

Recent decades have trended slightly warmer at Portugal, in line with regional sea-surface temperature records for the wider basin.

Monthly averages below are drawn from multi-decadal climatology and are updated as new observations arrive.

Jan
15°C
Feb
14°C
Mar
15°C
Apr
16°C
May
17°C
Jun
19°C
Jul
20°C
Aug
21°C
Sep
21°C
Oct
19°C
Nov
18°C
Dec
16°C

Values are area averages; individual beaches vary by exposure and depth.

Portugal sea temperature: frequently asked questions

What is the warmest month to swim in Portugal?

August is the warmest month in Portugal, when the sea averages about 21°C. Late-season warmth often persists a few weeks after peak.

When is the sea coldest in Portugal?

The coldest month in Portugal is typically February, when the water averages around 14°C. Cold-water swimmers and surfers dominate this period.

When can you swim in Portugal without a wetsuit?

The main swimming season in Portugal runs from July – September — about 3 months a year when the sea sits above 20°C, the level most swimmers describe as pleasant without a wetsuit.

Do I need a wetsuit in Portugal?

Outside peak summer the water in Portugal drops toward 14°C, so a 3/2mm shorty or full wetsuit makes long swims much more comfortable. In peak months most swimmers go without.

What is the average sea temperature in Portugal?

The long-term annual mean sea temperature in Portugal is about 18°C, based on multi-decadal climatology of the surrounding waters.

How do I check the current sea temperature in Portugal?

The live reading at the top of this page shows the current sea temperature in Portugal, updated hourly from marine buoy and satellite data. The 7-day forecast covers water, air, waves, wind and UV for the week ahead.

Portugal sea temperature by month

Average sea temperatures around Portugal for every month of the year, based on long-term Open-Meteo marine climatology.

Monthly average sea temperature in Portugal
MonthAverage sea
January15.0°C
February14.0°C
March15.0°C
April16.0°C
May17.0°C
June19.0°C
July20.0°C
August ⭐21.0°C
September21.0°C
October19.0°C
November18.0°C
December16.0°C

Monthly figures are modelled climatology averages, not live readings. How accurate is our data?

Coastal regions of Portugal

Region hubs with live sea temperatures, swim conditions and a beach directory.

Algarve
77 beaches
Dramatic ochre cliffs and warm Atlantic swims in southern Portugal.
Silver Coast
34 beaches
34 tracked beaches in Silver Coast, Portugal, with live Atlantic Ocean temperatures.
Costa Verde
24 beaches
24 tracked beaches in Costa Verde, Portugal, with live Atlantic Ocean temperatures.
Lisbon Coast
24 beaches
24 tracked beaches in Lisbon Coast, Portugal, with live Atlantic Ocean temperatures.

Warmest beaches in Portugal right now

BeachRegionSea
Praia de Monte ClérigoAlgarve18.7°C
Praia do CarvalhalAlentejo Coast18.7°C
Praia da BalaiaAlgarve18.7°C
Praia da CoelhaAlgarve18.7°C
Praia do BarrancoAlgarve18.7°C
Praia das FurnasAlentejo18.7°C
Praia do MecoLisbon Coast18.7°C
Praia da Figueira da FozSilver Coast18.7°C
Praia do Porto MonizMadeira18.6°C
Praia da OuraAlgarve18.6°C
Praia dos AveirosAlgarve18.6°C
Praia do EvaristoAlgarve18.6°C
Praia da Marina VilamouraAlgarve18.6°C
Praia da Aberta NovaAlentejo18.6°C
Praia da RainhaLisbon Coast18.6°C
Praia do Ribeiro do CavaloLisbon Coast18.6°C
Praia da AgudaCosta Verde18.6°C
Praia de MiramarCosta Verde18.6°C
Praia de PovoaCosta Verde18.6°C
Praia de MachicoMadeira18.6°C
Praia das MaçãsLisbon Coast18.5°C
Praia de NazaréSilver Coast18.5°C
Praia do BalealSilver Coast18.5°C
Prainha do CaniçalMadeira18.5°C
Praia dos PescadoresAlgarve18.5°C
Praia dos CaneirosAlgarve18.5°C
Praia do AncaoAlgarve18.5°C
Ilha da CulatraAlgarve18.5°C
Praia de FaroAlgarve18.5°C
Praia do MalhaoAlentejo18.5°C
Praia de MelidesAlentejo18.5°C
Praia da UrsaLisbon Coast18.5°C
Praia de Santo AmaroLisbon Coast18.5°C
Praia do SupertubosSilver Coast18.5°C
Praia do Cabedelo FigueiraSilver Coast18.5°C
Praia da GranjaCosta Verde18.5°C
Praia de LecaCosta Verde18.5°C
Praia de AfifeCosta Verde18.5°C
Praia da CalhetaMadeira18.5°C
Praia da FalésiaAlgarve18.4°C
Praia da LuzAlgarve18.4°C
Praia da Vinha da AreiaAzores18.4°C
Praia da MaretaAlgarve18.4°C
Praia de Vila Nova de MilfontesAlentejo18.4°C
Praia do PegoAlentejo18.4°C
Praia da Fonte da TelhaLisbon Coast18.4°C
Praia da ConsolacaoSilver Coast18.4°C
Praia do Norte VianaCosta Verde18.4°C
Praia de AlvorAlgarve18.3°C
Praia da AmoreiraAlgarve18.3°C
Praia do GuinchoLisbon Coast18.3°C
Praia da GaléAlentejo Coast18.3°C
Praia da ZambujeiraAlentejo Coast18.3°C
Praia do NorteSilver Coast18.3°C
Praia FormosaMadeira18.3°C
Doca do CavacasMadeira18.3°C
Praia Grande GraciosaAzores18.3°C
Praia do Porto de MosAlgarve18.3°C
Praia do ZavialAlgarve18.3°C
Praia dos SalgadosAlgarve18.3°C
Praia do CasteloAlgarve18.3°C
Praia do ParaisoAlgarve18.3°C
Ilha da ArmonaAlgarve18.3°C
Praia de Sao Martinho do PortoSilver Coast18.3°C
Praia da Foz do ArelhoSilver Coast18.3°C
Praia da FofaSilver Coast18.3°C
Praia dos NavegantesSilver Coast18.3°C
Praia da VieiraSilver Coast18.3°C
Praia de Sao JacintoSilver Coast18.3°C
Praia da EriceiraSilver Coast18.3°C
Praia de Cabedelo VianaCosta Verde18.3°C
Praia de Vila Praia de AncoraCosta Verde18.3°C
Praia do CarvoeiroAlgarve18.2°C
Praia de São LourençoAzores18.2°C
Praia do MartinhalAlgarve18.2°C
Praia da Rocha BaixinhaAlgarve18.2°C
Praia do Farol MilfontesAlentejo18.2°C
Praia da Ilha do PessegueiroAlentejo18.2°C
Praia de Sao Joao CaparicaLisbon Coast18.2°C
Praia da MadalenaCosta Verde18.2°C
Praia de MoledoCosta Verde18.2°C
Praia da AdragaLisbon Coast18.1°C
Porto Moniz PoolsMadeira18.1°C
Praia do CamiloAlgarve18.1°C
Praia da Falesia VilamouraAlgarve18.1°C
Praia VerdeAlgarve18.1°C
Praia da Costa da CaparicaLisbon Coast18.1°C
Praia do Senhor da PedraCosta Verde18.1°C
Praia de MatosinhosCosta Verde18.1°C
Praia de OfirCosta Verde18.1°C
Praia dos Reis MagosMadeira18.1°C
Praia Dona AnaAlgarve18.0°C
Praia de QuarteiraAlgarve18.0°C
Praia do VauAlgarve18.0°C
Praia do PinhaoAlgarve18.0°C
Praia de Sao RafaelAlgarve18.0°C
Praia da GaleAlgarve18.0°C
Praia do BarrilAlgarve18.0°C
Praia do Portinho da ArrabidaLisbon Coast18.0°C
Praia dos GalapinhosLisbon Coast18.0°C
Praia da CaliforniaLisbon Coast18.0°C
Praia de Salir do PortoSilver Coast18.0°C
Praia da AssentaSilver Coast18.0°C
Praia da Ribeira BravaMadeira18.0°C
Praia da RochaAlgarve17.9°C
Meia PraiaAlgarve17.9°C
Praia GrandeLisbon Coast17.9°C
Praia de Santa BárbaraAzores17.9°C
Praia dos Tres CastelosAlgarve17.9°C
Praia do Vale FigueiraAlgarve17.9°C
Praia Armacao de PeraAlgarve17.9°C
Praia de Vale CovoAlgarve17.9°C
Praia da Manta RotaAlgarve17.9°C
Ilha do FarolAlgarve17.9°C
Praia de Troia MarAlentejo17.9°C
Praia da Cova GalaSilver Coast17.9°C
Praia da VagueiraSilver Coast17.9°C
Praia de Ribeira dIlhasSilver Coast17.9°C
Praia de Sao LourenoSilver Coast17.9°C
Praia dos CoxosSilver Coast17.9°C
Praia do Homem do LemeCosta Verde17.9°C
Praia de FaoCosta Verde17.9°C
Praia Formosa Santa MariaAzores17.9°C
Praia do AlmoxarifeAzores17.9°C
Praia da MarinhaAlgarve17.8°C
Praia de CarcavelosLisbon Coast17.8°C
Porto Santo BeachMadeira17.8°C
Seixal Natural PoolsMadeira17.8°C
Praia dos EstudantesAlgarve17.8°C
Praia do TonelAlgarve17.8°C
Praia da Marinha RicaAlgarve17.8°C
Praia do Homem NuAlgarve17.8°C
Praia dos AlteirinhosAlentejo17.8°C
Praia de SesimbraLisbon Coast17.8°C
Praia do Molhe LesteSilver Coast17.8°C
Praia de Porto NovoSilver Coast17.8°C
Praia de Sao Pedro MoelSilver Coast17.8°C
Praia dos InglesesCosta Verde17.8°C
Praia dos MoinhosAzores17.8°C
Praia das MiliciasAzores17.8°C
Praia do PópuloAzores17.7°C
Praia da BatataAlgarve17.7°C
Praia da SalemaAlgarve17.7°C
Praia da ConceicaoLisbon Coast17.7°C
Praia de Osso da BaleiaSilver Coast17.7°C
Praia dos CarneirosCosta Verde17.7°C
Praia de Vila ChaCosta Verde17.7°C
Praia de MindeloCosta Verde17.7°C
Prainha MadeiraMadeira17.7°C
Praia de Porto PimAzores17.7°C
Praia de OdeceixeAlgarve17.6°C
Praia da Ribeira do NatalMadeira17.6°C
Praia do AlemaoAlgarve17.6°C
Praia da ArrifanaAlgarve17.6°C
Praia de Santa EulaliaAlgarve17.6°C
Praia Grande FerragudoAlgarve17.6°C
Praia dos Olhos de AguaAlgarve17.6°C
Praia do TrafalAlgarve17.6°C
Praia de AlmograveAlentejo17.6°C
Praia de Porto CovoAlentejo17.6°C
Praia de SinesAlentejo17.6°C
Praia da ComportaAlentejo17.6°C
Praia do Malhao CavaleiroAlentejo17.6°C
Praia do MagoitoLisbon Coast17.6°C
Praia da FigueirinhaLisbon Coast17.6°C
Praia do CDSLisbon Coast17.6°C
Praia de PedrogaoSilver Coast17.6°C
Praia da RedondaCosta Verde17.6°C
Praia de TaviraAlgarve17.5°C
Praia da BordeiraAlgarve17.5°C
Praia dos CareanosAlgarve17.5°C
Praia da FigueiraAlgarve17.5°C
Praia do BelicheAlgarve17.5°C
Praia da CordoamaAlgarve17.5°C
Praia Grande ArmacaoAlgarve17.5°C
Praia da AlagoaAlgarve17.5°C
Praia de Sao TorpesAlentejo17.5°C
Praia da TorreLisbon Coast17.5°C
Praia da Areia BrancaSilver Coast17.5°C
Praia de Santa CruzSilver Coast17.5°C
Praia da BarraSilver Coast17.5°C
Praia de EspinhoCosta Verde17.5°C
Praia de BenagilAlgarve17.4°C
Praia do TamarizLisbon Coast17.4°C
Praia de PenicheSilver Coast17.4°C
Praia da Faja GrandeAzores17.4°C
Burgau BeachAlgarve17.4°C
Praia de Vale de CenteanesAlgarve17.4°C
Praia do Forte NovoAlgarve17.4°C
Praia do GarraoAlgarve17.4°C
Praia de CabanasAlgarve17.4°C
Praia de Sao JuliaoLisbon Coast17.4°C
Praia do Guincho PenicheSilver Coast17.4°C
Praia da Costa NovaSilver Coast17.4°C
Praia da AngeirasCosta Verde17.4°C
Praia do AmadoAlgarve17.3°C
Praia do GarajauMadeira17.3°C
Praia do CarvalhoAlgarve17.3°C
Praia do CastelejoAlgarve17.3°C
Praia de Monte GordoAlgarve17.3°C
Praia de MiraSilver Coast17.3°C
Praia de BuarcosSilver Coast17.3°C
Praia do Cabedelo Vila do CondeCosta Verde17.3°C
Praia do PopuloAzores17.3°C

Sea temperature in Portugal — FAQ

How warm is the sea in Portugal in November?

The sea off Portugal averages about 18.0°C in November, based on long-term monthly averages for this coast.

When is the best time to swim in Portugal?

Portugal is warmest in August (around 21.0°C) and coldest in February (around 14.0°C). There are typically 0 months a year when the water sits above 22°C.

What is the average yearly sea temperature in Portugal?

Across all twelve months, the sea in Portugal averages about 17.6°C.

Do you need a wetsuit to swim in Portugal?

The sea in Portugal stays below 22°C even at its warmest (~21.0°C in August), so a 3/2mm or thicker wetsuit is recommended for longer swims year-round.