Beach
Porth Ceiriad
Llanengan, United Kingdom · sea 15.8 °C at its warmest, in August

Sea temperature month by month
Monthly means in °C, NOAA OISST v2.1 climatology 1991–2020.
About
Porth Ceiriad is a south-east facing beach and bay in the parish of Llanengan, near to Abersoch, in the county of Gwynedd, North Wales. It has several interesting geological features.
Questions
How warm is the sea at Porth Ceiriad?
The sea off Porth Ceiriad averages 15.8 °C at its warmest, in August, and 8 °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 Porth Ceiriad?
The sea here never averages 20 °C in any month, so swimming means cold water all year. Some people do it anyway.
Where is Porth Ceiriad?
Porth Ceiriad is on the coast of Llanengan, United Kingdom, at 52.7951, -4.5016. The map on this site flies straight to it.