When is the best time to visit Mexico?
There is no single best month for all of Mexico. CDMX, Oaxaca, the Yucatán, Baja and the coasts have different weather, crowd and sea conditions, so choose the region first and the season second.
Answer
A good Mexico season decision starts with geography. Mexico City and the central highlands do not behave like the Caribbean coast. Oaxaca City is different from the Oaxacan beaches. Baja has its own sea-and-desert logic. The Yucatán can be shaped by heat, storms and sea conditions, while festivals can make some places memorable and crowded at the same time. Do not ask when Mexico is best in the abstract. Decide what kind of Mexico you want — food cities, ruins, beach time, desert coast, surf, festivals — then check the season for that region specifically.