Oil City, United States offers 3 beaches perfect for sunbathing, surfing, swimming, and more. Oil City, Louisiana, United States, is known for its history in the oil industry and the Louisiana State Oil and Gas Museum. The best time to travel to Oil City, United States, is in late spring (May to June) when the average air temperature is around 60-70°F, and the Allegheny River water temperature is approximately 55-65°F. Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!