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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.
At the height of summer the weather is always very hot, and the days are long, sunny and dry. The average daytime temperature in July and August is 30 Â°C in the shade, although in some days are possible temperatures of 38 or 40 Â°C. One thing is absolutely certain â Crete is the warmest large Greek island.