Benicia, United States offers 1 beach perfect for sunbathing, surfing, swimming, and more. Benicia is known for the Benicia Capitol State Historic Park and the Benicia Arsenal. The best time to travel to Benicia, United States, is from June to September, with average air temperatures ranging from 60°F to 80°F and water temperatures around 60°F. Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!