Mathis, United States offers 1 beach perfect for sunbathing, surfing, swimming, and more. Mathis, Texas, United States, is known for Lake Corpus Christi State Park. The best time to travel to Mathis, United States, is in late spring (April to May) 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!