Beach
Porth Tŷ Mawr
Gwynedd, 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
Traeth caregog ar arfordir ogleddol Llŷn, Gwynedd, Cymru, yw Porth Tŷ Mawr ym nghymuned Llangwnnadl, rhwng Porth Colmon a Rhwngyddwyborth, cyfeirnod grid OS 1882 3306, lledred 52.8644°G,…
Questions
How warm is the sea at Porth Tŷ Mawr?
The sea off Porth Tŷ Mawr 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 Tŷ Mawr?
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 Tŷ Mawr?
Porth Tŷ Mawr is on the coast of Gwynedd, United Kingdom, at 52.8644, -4.6929. The map on this site flies straight to it.