Beach
Maspalomas Dunes
San Bartolomé de Tirajana, Spain · sea 23.3 °C at its warmest, in September

Sea temperature month by month
Monthly means in °C, NOAA OISST v2.1 climatology 1991–2020, sampled 14 km offshore, at the nearest open water cell of a 0.25° grid.
About
The Maspalomas Dunes (Spanish: Dunas de Maspalomas) are sand dunes located on the south coast of the island of Gran Canaria, Province of Las Palmas, in the Canary Islands.
Questions
How warm is the sea at Maspalomas Dunes?
The sea off Maspalomas Dunes averages 23.3 °C at its warmest, in September, and 18.9 °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 Maspalomas Dunes?
The sea reaches 20 °C or more from May to December. Twenty degrees is where most swimmers stop calling water cold; below it, a wetsuit helps.
Where is Maspalomas Dunes?
Maspalomas Dunes is on the coast of San Bartolomé de Tirajana, Spain, at 27.7417, -15.5853. The map on this site flies straight to it.