May & June see peak temperatures in many areas. September is the heart of the hurricane season, which doesn't always bring hurricanes but does bring heavy rains on the Gulf and Pacific coasts.
Vacation time for many Mexicans and foreigners. Hot almost everywhere, and very wet on the Pacific coast.
December to April, the driest months over most of Mexico, bring winter escapees from colder countries. Christmas and Easter are Mexican holiday times, with transportation and coastal accommodations very busy.
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