The most consistently balmy weather can be found on the Pacific Coast from Manzanillo to the Guatemalan border. Due to variations in local microclimates, these generalizations should be taken with a grain of salt. The northern states of Mexico are heavily influenced by weather systems that descend from the north. Generally, skies will remain clear and daytime temperatures will be comfortable. Occasional bouts of cool rain lash the Gulf of Mexico coast.
Winds are predominately from north and east.
The exception to this is the narrow Isthmus of Tehuantepec where fierce northerly winds carry hot moist air southward from the Gulf of Mexico. Prevailing Summer Weather Dominant high pressure areas over much of the United States will block weather fronts from the north. Much of northern Mexico's summer weather arrives from the south and east, and the majority of southern Mexico's summer moisture originates deep within the interior of the African continent. The zonal flow carries the mass of hot moist air across the Atlantic. The quantity of moist hot air arriving from the east is enormous.