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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 islands often get even hotter when the sirocco winds blow in from North Africa. Average temperatures in Greece during June range from 18 to 28Â°C (64 to 82Â°F) in the island regions and 20 to 30Â°C (68 to 86Â°F) on the mainland. The average sea temperatures in Greece during June is a comfortable 21 to 22Â°C (70 to 72Â°F).