Beach
White Rock Beach
White Rock, Canada · sea 15.5 °C at its warmest, in August

Sea temperature month by month
Monthly means in °C, NOAA OISST v2.1 climatology 1991–2020, sampled 17 km offshore, at the nearest open water cell of a 0.25° grid.
About
beach in White Rock, British Columbia, Canada
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 White Rock Beach?
The sea off White Rock Beach averages 15.5 °C at its warmest, in August, and 7.4 °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 White Rock 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 White Rock Beach?
White Rock Beach is on the coast of White Rock, Canada, at 49.0200, -122.8050. The map on this site flies straight to it.