City beach
Sugar Beach
Toronto, Canada · sea 21.2 °C at its warmest, in August

Sea temperature month by month
Monthly means in °C, NOAA OISST v2.1 climatology 1991–2020.
About
Sugar Beach is an urban beach park in Toronto, Ontario, Canada, that opened in 2010. It is located across from Redpath Sugar Refinery in Toronto's eastern East Bayfront.
Questions
How warm is the sea at Sugar Beach?
The sea off Sugar Beach averages 21.2 °C at its warmest, in August, and 2.9 °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 Sugar Beach?
The sea reaches 20 °C or more from August. Twenty degrees is where most swimmers stop calling water cold; below it, a wetsuit helps.
Where is Sugar Beach?
Sugar Beach is on the coast of Toronto, Canada, at 43.6430, -79.3674. The map on this site flies straight to it.