There are usually quite a few people on the Hauptbad Langeoog from October to April.
From November to April the water at Hauptbad Langeoog is too cold to swim in.
From July to January Hauptbad Langeoog 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.
Diving
Kiting
Surfing
Windsurfing