The best time to visit Greece is, truly, any time. To get the essential advice for the best time to visit Greece, we spoke to travel experts Vasilis Sarmantas and Seetha Ramanathan, co-founders of the company Curated Greece; and Ronnie Liadis of Liadis Travel, who is also a Condé Nast Traveler Top Travel Specialist. If you want a vacation at the beach, late May to early October is the best time to visit Greece, according to Sarmantas and Ramanathan of Curated Greece: “The water is warmest from July to September, but this is also when tourist season on islands like Mykonos and Santorini are in full swing.