Refundores, Costa Rica offers 1 beach perfect for sunbathing, surfing, swimming, and more. Refundores, Guanacaste, Costa Rica, is known for Rincon de la Vieja National Park. The best time to travel to Refundores, Costa Rica, is from December to April, with average air temperatures around 85°F (29°C) and water temperatures near 82°F (28°C). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!