Rethymno, Greece offers 23 beaches perfect for sunbathing, surfing, swimming, and more. Rethymno is known for its Venetian Harbor, Fortezza Castle, and the Rimondi Fountain. The best time to travel to Rethymno, Greece, is from May to October, with average air temperatures ranging from 20-30°C (68-86°F) and water temperatures around 22-26°C (72-79°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!