They are found in the river valleys, close to the lakes, and they are overgrown by meadow and rushes vegetation. The high moors are found on local ground elevations and they are overgrown by peat communities, containing atlantic species of plants. Spring comes later and is cooler than in central parts of Poland. Autumn is warmer and lasts longer. Wind is an important factor, regulating life conditions at the seaside.
Western winds prevail in the area.
North-western winds, blowing from the sea, prevail in the summer. This wind direction in summer has a decisive influence on the dune formation and displacement. The height of these moving dunes reaches a dozen or so meters. These winds are also responsible for the creation of the coastal lakes, since they cause the closing of sea bays by sand-bars. The vascular flora in the Park is very diverse, and for that reason, the Slowinski National Park is among those with the most interesting vegetation.