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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.
Spring (March to May) Spring could be the best time to visit Mykonos with its warm days and plenty of sunshine but little rain. The beaches will be much quieter and free from tourists than the summer month, but it must be said that the nightlife is better in summer.