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Mykonos: Annual Weather Averages. July is the hottest month in Mykonos with an average temperature of 26Â°C (79Â°F) and the coldest is January at 9Â°C (48Â°F) with the most daily sunshine hours at 14 in July. The wettest month is November with an average of 170mm of rain.
The sea water temperature in Greece varies between 17 Â° C in the winter months and 27 Â° C in August. WHEN TO GO TO GREECE. The best months for traveling to Greece are the spring (April-June) and September to October. August and July are very hot, but they are the preferred months for vacationers. Climate of Athens. Climate of Crete. Climate of Mykonos. Climate of Rhodes. Climate of Santorini. 1  Santorini, Cyclades, Greece. 2  Potami, Samos, North Eastern Aegean Islands, Greece. 3  Temple of Poseidon, Cape Sounion, Greece Central, Greece.