Lisbon Coast is a coastal area of Portugal on the Atlantic Ocean, with 24 tracked beaches. The sea here ranges from about 14°C in the coolest month to 21°C at the summer peak, with roughly 3 months a year sitting above 20°C — the level most swimmers describe as pleasant without a wetsuit. Use the beach list below to check the current sea temperature at each spot before you head out.
Lisbon Coast
24 tracked beaches in Lisbon Coast, Portugal, with live Atlantic Ocean temperatures.
Sea
Atlantic Ocean
Avg sea temp now
20.9°C
Best months
July – September
Best time to swim in Lisbon Coast
The sea in Lisbon Coast 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.
Lisbon Coast sea temperature history
Long-term climatology for Lisbon Coast 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 Lisbon Coast, 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.
Lisbon Coast sea temperature: frequently asked questions
What is the warmest month to swim in Lisbon Coast?
August is the warmest month in Lisbon Coast, when the sea averages about 21°C. Late-season warmth often persists a few weeks after peak.
When is the sea coldest in Lisbon Coast?
The coldest month in Lisbon Coast is typically February, when the water averages around 14°C. Cold-water swimmers and surfers dominate this period.
When can you swim in Lisbon Coast without a wetsuit?
The main swimming season in Lisbon Coast 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 Lisbon Coast?
Outside peak summer the water in Lisbon Coast 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 Lisbon Coast?
The long-term annual mean sea temperature in Lisbon Coast is about 18°C, based on multi-decadal climatology of the surrounding waters.
How do I check the current sea temperature in Lisbon Coast?
The live reading at the top of this page shows the current sea temperature in Lisbon Coast, updated hourly from marine buoy and satellite data. The 7-day forecast covers water, air, waves, wind and UV for the week ahead.
Beaches in the Lisbon Coast
Ranked by current live sea temperature.
- 1Praia do GuinchoCascais, Portugal21.6°C
- 2Praia do MagoitoSintra, Portugal21.6°C
- 3Praia de SesimbraSesimbra, Portugal21.6°C
- 4Praia de CarcavelosCascais, Portugal21.3°C
- 5Praia da AdragaSintra, Portugal21.3°C
- 6Praia das MaçãsSintra, Portugal21.1°C
- 7Praia da UrsaSintra, Portugal21.1°C
- 8Praia da Costa da CaparicaCosta da Caparica, Portugal21.1°C
- 9Praia de Sao Joao CaparicaCosta da Caparica, Portugal21.1°C
- 10Praia da RainhaCascais, Portugal21.0°C
- 11Praia de Santo AmaroOeiras, Portugal20.9°C
- 12Praia do Ribeiro do CavaloSesimbra, Portugal20.9°C
- 13Praia de Sao JuliaoSintra, Portugal20.8°C
- 14Praia da FigueirinhaSetubal, Portugal20.8°C
- 15Praia da TorreOeiras, Portugal20.8°C
- 16Praia da CaliforniaSesimbra, Portugal20.8°C
- 17Praia dos GalapinhosSetubal, Portugal20.7°C
- 18Praia do CDSCosta da Caparica, Portugal20.7°C
- 19Praia GrandeSintra, Portugal20.6°C
- 20Praia da Fonte da TelhaCosta da Caparica, Portugal20.6°C
- 21Praia do TamarizEstoril, Portugal20.5°C
- 22Praia da ConceicaoCascais, Portugal20.5°C
- 23Praia do MecoSesimbra, Portugal20.4°C
- 24Praia do Portinho da ArrabidaSetubal, Portugal20.3°C
Swimming in the Lisbon Coast — FAQ
How warm is the sea in the Lisbon Coast in September?
The Atlantic Ocean off the Lisbon Coast averages about 21.0°C in September, based on long-term monthly averages for this coast.
When is the best time to swim in the Lisbon Coast?
The Lisbon Coast 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 the Lisbon Coast?
Across all twelve months, the sea in the Lisbon Coast averages about 17.6°C.
Do you need a wetsuit to swim in the Lisbon Coast?
The sea in the Lisbon Coast 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.