Weather in Machu Picchu
The weather system around the Andes has distinctly well-defined seasons.
There are strong seasonal fluctuations and hikers making their way to Machu Picchu along the Inca Trail should prepare themselves accordingly. The region has distinct dry and wet seasons and tourists visiting this part of Peru naturally prefer to do so during the dry season.
The dry summer season falls between May and September. Winter is warm and wet. Tourists prefer to visit Machu Picchu during the summer months when the region is going through its dry spell and getting around is easier. Summer in Machu Picchu means lots of sunshine, clear skies and pleasant, mild weather. The sunshine here is quite sharp because of the high altitude. The nights can be quite chilly because of the high altitude, and in fact, some nights are colder than usual with temperatures dipping to near freezing points.
The weather between the months of October and April is somewhat unpredictable, with frequent changes. There is no cause for concern though - the wettest months do not arrive until January.