Grigos, Greece offers 4 beaches perfect for sunbathing, surfing, swimming, and more. Grigos is known for its proximity to the Monastery of Saint John the Theologian and the Cave of the Apocalypse. The best time to travel to Grigos, Greece, is from May to September, with average air temperatures around 75°F (24°C) and water temperatures near 73°F (23°C). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!