Rumena, Chile offers 1 beach perfect for sunbathing, surfing, swimming, and more. Rumena, Bio Bio, Chile, is known for its proximity to the picturesque Laja Falls and the historic San Sebastian de Yumbel Church. The best time to travel to Rumena, Chile, is during the summer months of December to February, when the average air temperature is around 70°F (21°C) and the water temperature 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!