Guallaco, Chile offers 2 beaches perfect for sunbathing, surfing, swimming, and more. Guallaco is not widely recognized as a major tourist destination in the Bio Bio region of Chile. The best time to travel to Guallaco, Chile, is during the summer months of December to February, when the average air temperature is around 75°F (24°C) and the water temperature is approximately 68°F (20°C). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!