I stayed near Dźwirzyno for eight days at the end of June 2011 enjoying excellent weather and the very nice beach there. For five of those days we stayed in a very nice cabin at the nearby village of Rogowo and on the final two days I stayed in my van.
This is a really ideal camping spot with the sea on one side and the lake on the other!
When I stayed it was free, however the area was in the process of construction to make a paid area.
The weather here was superb, it rained only once during my time there. Unfortunately this did not last much longer as on this day the weather turned bad and it stayed that way for six days.