Cusco in July

May through September is dry season, which means clear skies and packed hostels. July is peak chaos—every gringo with a backpack and a Machu Picchu dream descends on the city. But the weather is perfect: sunny days, chilly nights, and no rain to turn those cobblestones into slip-and-slides. June hits the sweet spot. The crowds haven't reached full insanity yet, but the weather is still reliable. Plus, you get Inti Raymi on June 24th—the Festival of the Sun that turns the city into one massive celebration. Just book accommodations months ahead. September is underrated. The dry season is winding down, but you still get decent weather and fewer people fighting for the same Instagram shot at every viewpoint. Avoid January through March unless you enjoy hiking in mud. The rain comes hard and often, turning Sacred Valley day trips into soggy slogs. But if you don't mind getting wet, hotel prices drop by half and you'll have Machu Picchu almost to yourself.