Shingle & pebble
Nunnavuori
Turku, Finland · sea 17.2 °C at its warmest, in August

Sea temperature month by month
Monthly means in °C, NOAA OISST v2.1 climatology 1991–2020, sampled 40 km offshore, at the nearest open water cell of a 0.25° grid.
About
Nunnavuori is a 63-meter tall hill in Finland it is located between the Runosmäki residential area and the Impivaara Sports Center.
Questions
How warm is the sea at Nunnavuori?
The sea off Nunnavuori averages 17.2 °C at its warmest, in August, and 0.9 °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 Nunnavuori?
The sea here never averages 20 °C in any month, so swimming means cold water all year. Some people do it anyway.
Where is Nunnavuori?
Nunnavuori is on the coast of Turku, Finland, at 60.4828, 22.2594. The map on this site flies straight to it.