Sursee, Switzerland offers 1 beach perfect for sunbathing, surfing, swimming, and more. Sursee is known for its historic Old Town and the Sempachersee (Lake Sempach). The best time to travel to Sursee, Switzerland, is from June to August, when the average air temperature is around 20°C (68°F) and the nearby Lake Sempach's water temperature is approximately 18°C (64°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!