Beach
Llanbedrog beach
Gwynedd, United Kingdom · sea 16.6 °C at its warmest, in August

Sea temperature month by month
Monthly means in °C, NOAA OISST v2.1 climatology 1991–2020.
About
beach in Wales, cared for by the National Trust
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 Llanbedrog beach?
The sea off Llanbedrog beach averages 16.6 °C at its warmest, in August, and 7.6 °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 Llanbedrog beach?
The sea here never averages 20 °C in any month, so swimming means cold water all year. Some people do it anyway.
Where is Llanbedrog beach?
Llanbedrog beach is on the coast of Gwynedd, United Kingdom, at 52.8576, -4.4848. The map on this site flies straight to it.