It never rains but during the months from June to October its streets dampen due to a fine drizzle, called "garúa" in Spanish.

San Borja, as most of the rest of Metropolitan Lima, is built on the alluvial fan formed by the Rimac river during the Quaternary Period.

The probable earthquake intensity in the San Borja area is Grade VII in the Modified Mercalli scale.

This compares favourably with Grade IX in some areas of La Molina, Callao and Chorrillos.

The outer perimeter of 4.5 km is a very popular circuit for joggers and runners, and during weekends its adjacent streets are closed for jogging and other sports events.

The "Museo de la Nacion" is located on the north-west of the district on the corner between Javier Prado and Aviación avenues and very near to the National Library.

There is a very large collection of pre-colonial (before 1532) objects such as pottery, sculptures, mummies, textiles, weapons, tools, sacred idols and jewelry.

A series of three-dimensional scale models and aerial photographs of the country's main archaeological sites and replicas of the houses, clothing and artwork in ancient Peru are exhibited.

The main ancient Peruvian cultures like Chavin, Paracas, Moche, Nasca, Wari, Tiahuanaco, Chimu, and Inca are all represented and explained.

The new building has all the modern facilities such as a theater, an amphitheater, cafeteria, exhibition halls, 12 reading rooms with internet connections, storage areas and administrative offices.