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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.
Over the course of the year, the temperature in Mykonos typically varies from 48Â°F to 82Â°F and is rarely below 41Â°F or above 86Â°F. The warm season lasts for 98 days, from June 9 to September 15, with an average daily high temperature above 77Â°F. The hottest day of the year is August 1, with an average high of 82Â°F and low of 74Â°F.