July is high season in Greece, with gloriously sunny weather, azure skies, and warm seas. It's the perfect month for swimming and sunbathing—but you'll be sharing the beaches with lots and lots of visitors, and prices are at their highest.
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The Greek islands are wonderful from late April to early November. For swimming, sun, and beach activities it's warmest from late May to early October.
Greece in July is invariably hot, averaging 81 Fahrenheit in Athens (but reaching an average high of 91.5 Fahrenheit in the afternoon, with many days topping a sweltering 100 Fahrenheit). Many of the islands, plus the mountainous areas, can be a little cooler.
The sun can be relentless between 12 noon and 5 in the afternoon, so the best time to swim anywhere in Greece is between 9-11 AM and 5-8 PM. The sea is usually very calm in the morning hours, and as a rule the afternoon breeze brings some waves of varying sizes and intensity.
Generally very warm Ionian sea and central Mediterranean, slightly 'cooler' Aegean sea. The western coast of Greece, including the islands Corfu, Lefkada and Cephalonia is very warm, with sea surface temperatures in 28-30 °C range.
July is hot and sunny. Being one of the two busiest months of the year, if you are visiting in July, you will need to book your ferry tickets and stay at least two months in advance. Note that July is a very expensive month. The average temperature is 26.6°C/79.88°F (maximum 29.6°C/85.28°F | minimum 23.5°C/74.3°F).
July and especially August are the hottest and busiest months in the country. If you're planning on visiting historical sites in Athens or popular islands like Santorini or Mykonos, be prepared for extreme heat and huge crowds.
While the summer months of mid-June to mid-August offer the warmest temperatures and the most sunshine, they can also be very hot, with temperatures often rising above 90°F (32°C) during the day. The summer heat can make sightseeing less comfortable, and tourist sites can be crowded.