Euboea Regional Unit, Greece offers 1 beach perfect for sunbathing, surfing, swimming, and more. Euboea Regional Unit is known for the archaeological site of Eretria and the thermal springs of Edipsos. The best time to travel to Euboea Regional Unit, Greece, is from May to September, with average air temperatures ranging from 70°F to 85°F and water temperatures from 70°F to 78°F. Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!