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Peak season in Machu Picchu and Cusco is from June to August when tours and accommodation are usually booked out well in advance. An ideal time to visit Cusco and the Sacred Valley is right before peak season in April – May or just after peak season in September or October before the rains begin. The weather is good during these periods and everywhere is less crowded. Cusco, Machu Picchu and the Sacred Valley have just two seasons – wet (summer) and dry (winter).