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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.
Summers in Greece are usually very hot, and in July and August temperatures usually reach 30 to 35Â°C, but sometimes even 40Â°C and more. It is recommended in these temperatures to stay out of the sun from 11.00 to 14.00 when the sun it at its strongest.