In my Opinion the Beaches are very big. There are very long beaches and Special parts are for nudists. There are many other nudists around sometimes. But you must know that they are not exclusive. Means there is no barrier or Something. Many clothed people walk through there to reach the next non nude beach behind or anything. But no one really matters or anything.
Weather depens. In summer it can be very hot but the water is quiete cold most of the time.
Hope you understand everything. My English is not very good