Ag Ioannis Thermastis, Greece offers 1 beach perfect for sunbathing, surfing, swimming, and more. Ag Ioannis Thermastis is known for its proximity to the hot springs of Therma, which are a popular attraction for visitors seeking relaxation and therapeutic benefits. The best time to travel to Ag Ioannis Thermastis, Greece, is from late May to early October, with average air temperatures ranging from 75-85°F (24-29°C) and water temperatures around 72-78°F (22-26°C). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!