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The Dry Season (April â September) From mid-April through until the end of September is considered the dry season at Machu Picchu. Days are bright and sunny with daily average temperatures of 18 Â°C (64 Â°F), after sunset (around 6.15pm) temperatures drop down to around 10 â 12 Â°C (50 â 54 Â°F) and evenings are cooler.
In recent times, the hottest September temperature Cancun has ever seen is 39Â°C/102Â°F, whilst the coldest September temperature the resort has ever seen is 19Â°C/66Â°F. September is the wettest month of the year for Cancun, when the resort experiences 270mm / 11inches of rainfall spread out over 10 wet days.