Beach
Praia do Melão
Balneário Arroio do Silva, Brazil · sea 24.5 °C at its warmest, in February

Sea temperature month by month
Monthly means in °C, NOAA OISST v2.1 climatology 1991–2020, sampled 13 km offshore, at the nearest open water cell of a 0.25° grid.
About
beach in Balnéario Arroio do Silva
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 do Melão?
The sea off Praia do Melão averages 24.5 °C at its warmest, in February, and 16.7 °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 do Melão?
The sea reaches 20 °C or more from November to May. Twenty degrees is where most swimmers stop calling water cold; below it, a wetsuit helps.
Where is Praia do Melão?
Praia do Melão is on the coast of Balneário Arroio do Silva, Brazil, at -29.0323, -49.4568. The map on this site flies straight to it.