Apollonioi, Greece offers 12 beaches perfect for sunbathing, surfing, swimming, and more. Apollonioi, Ionian Islands, Greece, is known for its proximity to the stunning beaches of Porto Katsiki and Egremni. The best time to travel to Apollonioi, Greece, is from May to September, when the average air temperature is around 75°F (24°C) and the water temperature is approximately 73°F (23°C). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!