May-June (Late Spring): Warm and sunny (20-26°C) with the island's greenery at its lushest, wildflowers still blooming, and comfortably uncrowded beaches. Sea temperatures are cool but swimmable by June. One of the best windows to visit.
July-August (Peak Summer): Hot (28-33°C), with the busiest beaches, highest accommodation prices, and full ferry schedules. The Aeschylia ancient drama festival runs in the theatre during these months. Expect crowds at Giola and Marble Beach.
September-October (Early Autumn): Still warm (22-28°C) with noticeably thinner crowds, warm sea water lingering from summer, and the honey and olive harvests underway. Many consider this the ideal balance of good weather and fewer visitors.
November-April (Winter/Off-season): Mild but wet (10-16°C), with many hotels, tavernas, and even some ferry routes reduced or closed. Mountain villages can be atmospheric but beach and outdoor activities are largely unavailable.