There are usually quite a few people on the Platis Gialos Beach from November to May.
From May to October the air temperature at Platis Gialos Beach is perfect for sunbathing. The swimming season at Platis Gialos Beach occurs from June to October, when the water is warm and comfortable for swimming.
In December and January Platis Gialos Beach has rainy season. This is something to keep in mind when planning your trip since it is quite possible that you may be unable to sunbathe.