Beach
Playa del Sardinero
Cantabria, Spain · sea 21.5 °C at its warmest, in August

Sea temperature month by month
Monthly means in °C, NOAA OISST v2.1 climatology 1991–2020, sampled 18 km offshore, at the nearest open water cell of a 0.25° grid.
About
Las playas del Sardinero son dos arenales contiguos situados en el barrio homónimo de la ciudad de Santander, en la comunidad autónoma de Cantabria (España).
Questions
How warm is the sea at Playa del Sardinero?
The sea off Playa del Sardinero averages 21.5 °C at its warmest, in August, and 12.6 °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 Playa del Sardinero?
The sea reaches 20 °C or more from July to September. Twenty degrees is where most swimmers stop calling water cold; below it, a wetsuit helps.
Where is Playa del Sardinero?
Playa del Sardinero is on the coast of Cantabria, Spain, at 43.4752, -3.7848. The map on this site flies straight to it.