Beach
Thirteenth Beach
City of Greater Geelong, Australia · sea 19.1 °C at its warmest, in February

Sea temperature month by month
Monthly means in °C, NOAA OISST v2.1 climatology 1991–2020.
About
Thirteenth Beach is located west of Barwon Heads, Victoria, Australia and the name is taken from the close proximity of the beach to the thirteenth hole of the Barwon Heads Golf Course.
Questions
How warm is the sea at Thirteenth Beach?
The sea off Thirteenth Beach averages 19.1 °C at its warmest, in February, and 12.8 °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 Thirteenth 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 Thirteenth Beach?
Thirteenth Beach is on the coast of City of Greater Geelong, Australia, at -38.2829, 144.4440. The map on this site flies straight to it.