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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.
August is the most crowded and most expensive month in Greece. The weather is very hot, the beaches crowded and the festivals in full swing. Weather. Hot, very hotâ¦it doesnât matter if you are on the mainland or the islands, itâs hot, with temperatures reaching 100 F / 37.8 C on some days.