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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.
Mykonos sees nonstop action in the summer. Parties rage with the waves, and hotel rates peak with the temperatures. Although this is the warmest time (mid-80s), the ocean breeze and frequent dips in the water cool down visitors. You'll also get to experience several Mykonos festivals honoring the patron saints.