Checking to see if water temperatures in the Med would be warm enough for swimming in the Calanques or port beaches
I certainly would, but it depends on what you are used to!
Most years the water is still warm, but sometimes not if it has been windy
I also would certainly try, as I tend to swim in various shallow or sheltered beaches of the Med almost every October. It was September the last time that I was at Cassis and the Calenques were idyllic.