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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 weather in Santorini on May is always good. The average temperature is about 19 degrees. Late in the afternoon and evening it's cold but not too much. Dependants on you and in what weather you are used to (like the country you are coming from). October most of times is hotter than May.