Thermaikos, Greece offers 1 beach perfect for sunbathing, surfing, swimming, and more. Thermaikos is known for its proximity to the Thermaic Gulf and the vibrant city of Thessaloniki. The best time to travel to Thermaikos, Greece, is from late May to early October, with average air temperatures ranging from 70°F to 85°F and water temperatures from 72°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!