Monte Filis, Nicaragua offers 1 beach perfect for sunbathing, surfing, swimming, and more. Monte Filis, Rivas, Nicaragua, is known for its proximity to the stunning Ometepe Island and the picturesque beaches of San Juan del Sur. The best time to travel to Monte Filis, Nicaragua, 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!