Thira, Greece offers 15 beaches perfect for sunbathing, surfing, swimming, and more. Thira, South Aegean, Greece, is known for its stunning sunsets over the caldera, the iconic blue-domed churches of Oia, and the archaeological site of Akrotiri. The best time to travel to Thira, Greece, is from late April to early November, with average air temperatures ranging from 68°F to 86°F and water temperatures from 68°F to 77°F. Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!