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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.
Key weather averages for Greece in September. 1  28. 28Â°C max day temperature. 2  9. 9 hours of sunshine per day. 3  2. 2 days with some rainfall. 4  18. 18Â°C min night temperature. 5  12. 12 hours of daylight per day. 6  M. 7  13. 13 mm of monthly rainfall. 8  7. 7 (High) UV index. 9  25. 25Â°C sea temperature.