Beach
Praia de Silvalde
Portugal · sea 17.4 °C at its warmest, in September

Sea temperature month by month
Monthly means in °C, NOAA OISST v2.1 climatology 1991–2020, sampled 16 km offshore, at the nearest open water cell of a 0.25° grid.
Wikipedia has no article about this beach yet. It is on the atlas from its Wikidata record and its photograph.
Questions
How warm is the sea at Praia de Silvalde?
The sea off Praia de Silvalde averages 17.4 °C at its warmest, in September, and 13.2 °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 Praia de Silvalde?
The sea here never averages 20 °C in any month, so swimming means cold water all year. Some people do it anyway.
Where is Praia de Silvalde?
Praia de Silvalde is on the coast of Portugal, at 40.9858, -8.6478. The map on this site flies straight to it.
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