Port Lavaca, United States offers 8 beaches perfect for sunbathing, surfing, swimming, and more. Port Lavaca is known for the Lighthouse Beach and the Calhoun County Museum. The best time to travel to Port Lavaca, United States, is from March to May, with average air temperatures ranging from 65°F to 85°F and water temperatures around 70°F to 75°F. Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!