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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.
Share: Facebook Tweet Google+. The best time to visit Mykonos is September and October. Sitting in the Aegean Sea, this island's weather permits a year-round flow of tourists, but in those months you'll see that the crowds have left, the water remains warm and the hotel rates descend back into a reasonable range.