There are usually quite a few people on the Alca Su Beach from December to April.
From May to October the air temperature at Alca Su Beach is perfect for sunbathing. Some people feel that the water at Alca Su Beach is too warm in August.
In December and January Alca Su 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.