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Weather & Climate in San Juan, Peru
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
San Juan experiences four distinct seasons with an average annual temperature of 54°F (12°C). Winters average 52°F in January while summers reach 54°F in July / relatively mild seasonal variation. The area gets 350 sunny days per year, well above the U.S. average of 205 / making it one of the sunnier locations in the country. Annual precipitation totals 108.8 inches (wetter than the 38-inch national average). The city sits at an elevation of 8,904 feet.
Temperature
52°F Jan (11°C)
54°F Jul (12°C)
| Annual Average | 54.0°F |
| 0% below US avg | |
| January Average | 52°F (11°C) |
| July Average | 54°F (12°C) |
| Sunny Days | 350 days/yr |
Geography
| Elevation | 8,904 ft (2,714 m) |
| Area | 151.5 sq mi (392.5 km²) |
| Population Density | 6/sq mi |
| Coordinates | -7.2918°N, 78.4976°W |
| Timezone | America/Lima |
Precipitation & Snow
Air Quality
Earthquake History
38 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M6.0.
| Apr 11, 2005 | 18 km ENE of Shirac, Peru | M6.0 | 68 km | 130 km |
| May 15, 2014 | 16 km NNW of Paiján, Peru | M5.1 | 102 km | 64 km |
| Jul 20, 2016 | 15 km E of Virú, Peru | M4.9 | 124 km | 106 km |
| Mar 7, 2019 | 8 km NE of Miracosta, Peru | M4.9 | 134 km | 41 km |
| Aug 8, 2002 | 13 km S of Puente Viru, Peru | M4.9 | 143 km | 77 km |
| Jan 12, 2008 | 9 km SSE of Saña, Peru | M4.7 | 122 km | 71 km |
| May 7, 2015 | 5 km ENE of Sitabamba, Peru | M4.7 | 120 km | 48 km |
| Aug 25, 2009 | 23 km ENE of Sartimbamba, Peru | M4.7 | 110 km | 63 km |
| Apr 7, 2013 | 37 km W of Santiago de Cao, Peru | M4.6 | 144 km | 74 km |
| Jun 20, 1994 | 2 km NE of Celendín, Peru | M4.6 | 64 km | 125 km |
| Mar 1, 2008 | 8 km W of Aricapampa, Peru | M4.6 | 96 km | 55 km |
| Apr 14, 2012 | 12 km WSW of Moche, Peru | M4.6 | 124 km | 71 km |
| Jan 27, 2007 | 8 km W of Victor Raul, Peru | M4.6 | 130 km | 76 km |
| Jun 10, 2000 | 5 km N of Pátapo, Peru | M4.6 | 143 km | 33 km |
| Dec 1, 1998 | 14 km NNW of Chalamarca, Peru | M4.5 | 102 km | 33 km |
| Nov 9, 1994 | 17 km ESE of Huamachuco, Peru | M4.5 | 90 km | 33 km |
| Sep 12, 2024 | 9 km NE of Mollepata, Peru | M4.5 | 114 km | 53 km |
| Mar 4, 1991 | 13 km NNW of Parcoy, Peru | M4.5 | 127 km | 10 km |
| Jun 22, 2023 | 12 km NW of Tocmoche, Peru | M4.4 | 150 km | 102 km |
| Feb 19, 2024 | 9 km ENE of Lacabamba, Peru | M4.4 | 129 km | 10 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 52°F (11°C) | 3.5 in | Coldest |
| February | 56°F (13°C) | 4.2 in | |
| March | 56°F (14°C) | 4.8 in | Wettest |
| April | 56°F (14°C) | 3.5 in | |
| May | 56°F (13°C) | 1.5 in | |
| June | 55°F (13°C) | 0.4 in | |
| July | 54°F (12°C) | 0.4 in | Driest |
| August | 56°F (13°C) | 0.4 in | |
| September | 56°F (14°C) | 1.4 in | |
| October | 56°F (14°C) | 3.7 in | |
| November | 57°F (14°C) | 2.9 in | Warmest |
| December | 57°F (14°C) | 3.2 in |
San Juan has a seasonal temperature swing of 5°F / from 52°F in January to 57°F in November. Total annual precipitation is 30.1 inches, with March being the wettest month (4.8") and July the driest (0.4").