July and August are the hottest. The best time to visit is late spring (May) and fall (Sept–Oct). It's pleasant, with comfortable weather, no rain, and smaller crowds (except during holiday weekends). Winter (late October through mid-March) is colder, with some rainfall.
Which Greek island is hot in May?
CreteCrete. Crete is the southernmost island in Greece and enjoys average May daytime temperatures of 23 degrees/74 Fahrenheit making it one of the warmest greek islands to visit in May. The water is usually warm enough for swimming and the weather is usually calm, with occasional showers.