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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.
Over the course of June in Mykonos, the length of the day is essentially constant. The shortest day of the month is June 1, with 14 hours, 34 minutes of daylight and the longest day is June 21, with 14 hours, 45 minutes of daylight.