Map - San Martín Sacatepéquez (Municipio de San Martín Sacatepéquez)

San Martín Sacatepéquez is one of 24 municipalities in the department of Quetzaltenango, Guatemala. San Martín Sacatepéquez has a surface area of 100 km2. The center of the town is situated at 2450 m above mean sea level. According to the most recent government survey, the population of the municipality is 28,926 people.

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 m 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 m above sea level to the peak of the Siete Orejas Volcano, San Martín's highest point at 3370 m 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.