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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 summer nights are warm, but not usually uncomfortable. Most seasons are hard to distinguish and any changes in the monthly climate are quite subtle. The coolest weather falls between December and February, although by day, temperatures usually hang around 13Â°C / 55Â°F or thereabouts. By night, Mykonos often feels chilly during this winter period and frosts are not out of the ordinary.