There are usually quite a few people on the Nordseeheilbad Duhnen from November to March.
From November to April the water at Nordseeheilbad Duhnen is too cold to swim in.
From July to January Nordseeheilbad Duhnen 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