Monteon, Mexico offers 1 beach perfect for sunbathing, surfing, swimming, and more. Monteon, Nayarit, Mexico, is known for its proximity to the popular tourist destination of Sayulita and the beautiful beaches of the Riviera Nayarit. The best time to travel to Monteon, Mexico, is between November and April, when the average air temperature is around 75°F (24°C) and the water temperature is approximately 78°F (26°C). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!