Blawnox, United States offers 1 beach perfect for sunbathing, surfing, swimming, and more. Blawnox, Pennsylvania, United States, is known for its proximity to the Allegheny River and its charming small-town atmosphere. The best time to travel to Blawnox, United States, is in late spring (May), when the average air temperature is around 65°F (18°C) and water temperature in nearby rivers is approximately 60°F (16°C). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!