I got that beach much cleaner that you... it was paradisiac to me. 25C at the time, in my watch.
It was amazing... has been a while I haven't been on such hot waters.
The hottest ones were in Madeira (on a place where there is volcanic heat, and water can get as high as 60 C...)
I have done midnight that... and it was unique!
Wuao at night in Madeira must be a great experience.
The water was warm but it was extremely windy this day so it was very cold anyway, but I still took a swim 💪🏻