Most of the State of Chiapas is humid rain forest, with only the northern part of the Central Valley of Chiapas being dry. The mean temperature is 20º C., although in the lowlands 40º C. has been reached. Cool nighttime temperatures usually reign in the area of San Cristóbal de las Casas in the central highlands.
As in all of Mexico, the summer months, from June through the end of September, constitute the rainy season. Though usually tropical rains are steady during the wet season in that they can fall practically every day, or at least several times a week, their duration is usually relatively short with a tendency toward sudden, heavy afternoon and evening showers or rainstorms rather than tedious day-long sprinkles.
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