Beach
Cabedelo do Douro
Vila Nova de Gaia, Portugal · sea 17.4 °C at its warmest, in September

Sea temperature month by month
13.6Jan
13.2Feb
13.6Mar
14.4Apr
15.5May
16.7Jun
17.1Jul
17.3Aug
17.4Sep
16.6Oct
15.5Nov
14.3Dec
Monthly means in °C, NOAA OISST v2.1 climatology 1991–2020.
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 Cabedelo do Douro?
The sea off Cabedelo do Douro 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 Cabedelo do Douro?
The sea here never averages 20 °C in any month, so swimming means cold water all year. Some people do it anyway.
Where is Cabedelo do Douro?
Cabedelo do Douro is on the coast of Vila Nova de Gaia, Portugal, at 41.1396, -8.6677. The map on this site flies straight to it.
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Gondarem beachAldoar, Foz do Douro e Nevogilde, Portugal
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Aquario beachAldoar, Foz do Douro e Nevogilde, Portugal