When to go

No time is decidedly bad to visit Mexico. That said, in the low-lying and coastal areas of the country, May to September are the hottest, wettest and rainiest months. From June to November, it is cyclone season all along the coast of the Yucatan Peninsula (states of Quintana Roo, Mérida and Campeche), powerful cyclones can seriously affect these states and even others further north like Tabasco and Chiapas. Even if it is normal that there is no great instability, if you travel to these areas at this time, know that you may have the misfortune of finding, for a week or more, cloudy skies, strong winds and rain that can cause some destruction. 

Still, July and August and mid-December to early January are the peak vacation seasons for both Mexicans and foreigners. At these times, the coastal resorts tend to be pineapple.

From November to the end of February is the Mexican winter. The lands in the interior cool in such a way that, in the higher ones, there are diurnal minimums below 0ºC and even snow. This is what happens, for example, in the state of Chihuahua.