San Martín Sacatepéquez is located on the edge of the volcanic chain that divides the Western Highlands of Guatemala from the coastal plain. Just below the volcanic chain, to the southwest, the rich Boca Costa (piedmont) soils extend toward the Pacific Ocean. The Boca Costa occupies the warmer more tropical lands from 300 to 1800 meters above sea level. To the northeast lies the altiplano, the elevated pumice-laden volcanic highlands. The altiplano encompasses the colder territory found at higher elevations, ranging from 1800 meters above sea level to the peak of theSiete Orejas Volcano, San Martín’s highest point at 3370 meters above sea level.
As is true throughout much of the highlands of Guatemala, in San Martín weather is divided into two seasons: the rainy season -- which lasts from early May to early November -- and the dry season -- which lasts from early November to early May
