Copper Canyon in September

October through March brings perfect weather - warm days, cool nights, and minimal rain. December and January can get cold at rim elevations, so pack layers. The train runs year-round, but summer brings afternoon thunderstorms that can delay schedules. Spring offers wildflowers and comfortable temperatures. Avoid July and August unless you enjoy hiking in humidity and dodging daily downpours. Winter months provide the clearest canyon views and best hiking conditions. The Tarahumara Easter celebrations in March or April offer cultural experiences, but expect crowds. Book accommodations well ahead for winter visits - options are limited and fill up during peak season.