River & lake beach
Praia dos Moinhos
Alcochete, Portugal · sea 18.9 °C at its warmest, in August

Sea temperature month by month
Monthly means in °C, NOAA OISST v2.1 climatology 1991–2020, sampled 42 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 dos Moinhos?
The sea off Praia dos Moinhos averages 18.9 °C at its warmest, in August, and 14.7 °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 dos Moinhos?
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 dos Moinhos?
Praia dos Moinhos is on the coast of Alcochete, Portugal, at 38.7464, -8.9778. The map on this site flies straight to it.
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