Beach
Guincho Beach
Alcabideche, Portugal · sea 18.8 °C at its warmest, in September

Sea temperature month by month
Monthly means in °C, NOAA OISST v2.1 climatology 1991–2020, sampled 15 km offshore, at the nearest open water cell of a 0.25° grid.
About
Praia do Guincho (English: Guincho Beach) is an Atlantic beach located on Portugal's Estoril coast, 5 km from the town of Cascais, and is located in the municipality of Cascais, more…
Questions
How warm is the sea at Guincho Beach?
The sea off Guincho Beach averages 18.8 °C at its warmest, in September, and 14.6 °C at its coolest. These are monthly means from NOAA's OISST v2.1 satellite and buoy record for 1991 to 2020, sampled at the beach's own coordinates.
When can you swim at Guincho Beach?
The sea here never averages 20 °C in any month, so swimming means cold water all year. Some people do it anyway.
Where is Guincho Beach?
Guincho Beach is on the coast of Alcabideche, Portugal, at 38.7332, -9.4727. The map on this site flies straight to it.