There are usually quite a few people on the Borkum Ostbad from September to May.
From November to April the water at Borkum Ostbad is too cold to swim in.
From July to January Borkum Ostbad 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