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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.
Averages for Mykonos in January. Weather lowdown. Winter is in full swing in January but the days can still reach a pleasant 12Â°C though night time temperatures drop well below 10Â°C. Temperatures in the low to mid-teens are more common and significantly lower than the summer average high/low temperatures of 18 to 30Â°C seen in July and August.