Beach
Five Mile Beach
South Gippsland Shire, Australia · sea 18.8 °C at its warmest, in February

Sea temperature month by month
Monthly means in °C, NOAA OISST v2.1 climatology 1991–2020.
About
beach in Victoria, Australia
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 Five Mile Beach?
The sea off Five Mile Beach averages 18.8 °C at its warmest, in February, and 12.4 °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 Five Mile 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 Five Mile Beach?
Five Mile Beach is on the coast of South Gippsland Shire, Australia, at -38.9450, 146.4530. The map on this site flies straight to it.