With its Mediterranean climate, Mannheim is one of Germany's sunniest cities. And what's the perfect way to enjoy a hot summer? Right first time. At a bathing lake. Relax on the grass, splash around in the children's pool or romp around in the playground. The Stollenwörthweiher lake is fun for the whole family. If you prefer to take things slow and easy, simply enjoy a refreshing dip in the pristine lake water.