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For a full helping of summer heat, fly to Kefalonia in June, July or August. This is when the island's beach scene is in full swing. The sands are laden with happy sunbathers, the water beckons you in for a dip and a gentle sea breeze keeps everyone from overheating.
May, September and October are warm and pleasant in Kefalonia. The weather is still good for the beaches and the sea, although cooler, is nice for a dip. There's lots of heat and sunshine during the day but you may need something to cover up with at night. It's the perfect temperature for hiking in the mountains and exploring Kefalonia's fascinating historic sites.