Geneva On The Lake, United States offers 2 beaches perfect for sunbathing, surfing, swimming, and more. Geneva On The Lake is known for its historic amusement park, Adventure Zone, and the scenic Lake Erie shoreline. The best time to travel to Geneva On The Lake is during the summer months of June to August, when the average air temperature is around 75°F (24°C) and the water temperature is approximately 70°F (21°C). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!