Port Tobacco, United States offers 1 beach perfect for sunbathing, surfing, swimming, and more. Port Tobacco, Maryland, United States, is known for the historic Port Tobacco Courthouse and the Thomas Stone National Historic Site. The best time to travel to Port Tobacco, United States, is in late spring (May), when the average air temperature is around 70°F (21°C) and the nearby Potomac River water temperature is approximately 65°F (18°C). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!