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Weather & Climate in San Juan, Peru
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
San Juan enjoys a temperate climate with an average annual temperature of 70°F (21°C). Winters average 68°F in January while summers reach 70°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 69.3 inches (wetter than the 38-inch national average). The area receives 208.0 inches of snow annually, making winter weather a significant factor for residents. The city sits at an elevation of 8,028 feet.
Temperature
68°F Jan (20°C)
70°F Jul (21°C)
| Annual Average | 69.7°F |
| 29% above US avg | |
| January Average | 68°F (20°C) |
| July Average | 70°F (21°C) |
| Sunny Days | 350 days/yr |
Geography
| Elevation | 8,028 ft (2,447 m) |
| Area | 1,153.7 sq mi (2,988.0 km²) |
| Population Density | 0/sq mi |
| Coordinates | -13.2035°N, 75.6346°W |
| Timezone | America/Lima |
Precipitation & Snow
Air Quality
Earthquake History
401 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M8.0.
| Aug 15, 2007 | 41 km SW of San Vicente de Cañete, Peru | M8.0 | 107 km | 39 km |
| Aug 16, 2007 | 46 km WSW of Santiago, Peru | M6.4 | 131 km | 23 km |
| Jan 30, 2012 | 6 km ESE of Pampa de Tate, Peru | M6.4 | 107 km | 43 km |
| Apr 5, 1991 | 21 km ESE of Pampa de Tate, Peru | M6.3 | 115 km | 50 km |
| May 16, 1992 | 4 km E of San Clemente, Peru | M6.1 | 73 km | 57 km |
| Mar 15, 2014 | 24 km SSW of Paracas, Peru | M6.1 | 122 km | 20 km |
| Feb 2, 2009 | 40 km WNW of Pisco, Peru | M6.0 | 108 km | 21 km |
| Aug 18, 2007 | 7 km NNW of Paracas, Peru | M6.0 | 98 km | 30 km |
| Aug 16, 2007 | 46 km S of Paracas, Peru | M6.0 | 136 km | 35 km |
| Jun 23, 2021 | 11 km WSW of Mala, Peru | M5.9 | 130 km | 50 km |
| Feb 18, 2014 | 10 km ESE of Pampa de Tate, Peru | M5.9 | 107 km | 57 km |
| Aug 17, 2007 | 44 km WNW of Pisco, Peru | M5.9 | 114 km | 49 km |
| Aug 16, 2007 | 25 km W of Santiago, Peru | M5.8 | 119 km | 35 km |
| Aug 19, 2007 | 45 km WNW of Pisco, Peru | M5.8 | 116 km | 11 km |
| Aug 16, 2007 | 38 km SW of San Vicente de Cañete, Peru | M5.8 | 106 km | 34 km |
| Jul 2, 2012 | 29 km SSE of Santiago, Peru | M5.7 | 136 km | 40 km |
| Sep 22, 2010 | 6 km ENE of Chincha Alta, Peru | M5.7 | 52 km | 50 km |
| Apr 21, 2001 | 51 km WNW of Pisco, Peru | M5.6 | 117 km | 39 km |
| Aug 19, 2007 | 32 km WNW of Pisco, Peru | M5.6 | 105 km | 35 km |
| Aug 16, 2007 | 22 km SSW of San Vicente de Cañete, Peru | M5.6 | 93 km | 40 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Tsunami History
2 tsunamis recorded within 500 km. Highest wave on record: 10.1 m (33 ft).
| Year | Location | Cause | Max Wave | Deaths | Distance |
| 2007 | S. PERU | Earthquake | 10.1 m | 596 | 107 km |
| 1687 | S. PERU | Earthquake | — | 5,000 | 99 km |
Source: NOAA/NCEI Historical Tsunami Database.
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 68°F (20°C) | 3.4 in | |
| February | 55°F (13°C) | 4.1 in | |
| March | 54°F (12°C) | 4.8 in | Wettest |
| April | 54°F (12°C) | 0.8 in | |
| May | 52°F (11°C) | 0.1 in | |
| June | 49°F (10°C) | 0.0 in | Coldest, Driest |
| July | 70°F (21°C) | 0.0 in | Warmest |
| August | 50°F (10°C) | 0.0 in | |
| September | 51°F (11°C) | 0.1 in | |
| October | 53°F (12°C) | 0.4 in | |
| November | 54°F (12°C) | 0.4 in | |
| December | 54°F (12°C) | 1.4 in |
San Juan has a seasonal temperature swing of 21°F / from 49°F in June to 70°F in July. Total annual precipitation is 15.6 inches, with March being the wettest month (4.8") and June the driest (0.0").