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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.
Santorini Weather: The climatic conditions on Santorini Greece are the same as in the whole Cyclades region. From April to August, the weather in Santorini is bright and sunny. From September and on, it is not rare to see some cloudy days. The rainfalls are very rare. The humidity level is very high.