San Pedro provides a perfect base for exploring the surrounding Atacama Desert, the driest in the world, where visitors partake of fascinating excursions such as visits to archaeological sites, ancient villages, colonial towns, salt flats, geysers, oasis and the unique Valley of the Moon. Outings range from excursions on especially prepared vehicles to mountain biking, trekking and horseback riding. The driest desert in the world is a pretty cold place where temperatures fluctuate daily between 32F and 80F. Atacama gets almost no rainfall throughout the year. Temperatures range from 30F to 70F in the winter time (June through August).