Therma, Greece offers 1 beach perfect for sunbathing, surfing, swimming, and more. Therma is known for its natural hot springs and beautiful beaches. The best time to travel to Therma, Greece, is from late May to early October, when the average air temperature ranges from 25°C to 30°C (77°F to 86°F) and the sea temperature is around 23°C to 26°C (73°F to 79°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!