In the summer it's pretty nice. I don't remember but I'm not a fan of super cold water and I found it enjoyable. In the winter the harbour freezes, though it remains navigable (i.e. not thick ice; more of a skin, but it gives you an idea of the winter temperature).

Sea temp is pretty ok, it’s a lot less exposed than the “big” oceans. Often over 20 in summer. Same as many North Atlantic beaches, or othe “cold water” beaches like south Australia etc. Shallow and protected makes more difference to sea temp than latitude. It’s like a big lake effectively (not even salty)

Agree completely (posted from my yearly exile from Stockholm to Canary Islands)

So it's the Swedish equivalent of Dim Sum.