Best Andes Travel runs Inca Trail and Machu Picchu holidays from January to December except February. The Southern Hemisphere winter season in the Andes runs roughly from the end of March through to October and this is the optimum period for trekking in this part of Peru as it the time of least precipitation. From April to October you can expect the days to be warm and sunny, although you will experience a variance in temperatures depending on altitude. Daytime temperatures will range from 12 to 20 degrees C. Evenings can be chilly, particularly at higher altitudes. At campsites above 3800m it can fall to below freezing at night. The Inca Trail is closed to trekkers in February each year for maintenance, although Machu Picchu is open as usual.