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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 nighttime temperatures during these months will drop to the 40âs, with freezing temperatures occasionally being reached. Mykonos is a fairly dry island, and rain rarely ruins entire days. The wettest months of the year are February and March, but even during this time there is much sunshine to be enjoyed. In fact, the island experiences over 300 days of sunshine per year, which means that most people visiting Mykonos come away tanned and happy. Although rain may not be a major issue, wind is. The summer and winter seasons experience consistently heavy winds.