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Weather & Climate in San Juan, Peru
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
San Juan has a cool climate with an average annual temperature of 40°F (4°C). Winters average 39°F in January while summers reach 40°F in July / relatively mild seasonal variation. The area gets 356 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 44.7 inches. The area receives 109.8 inches of snow annually, making winter weather a significant factor for residents. The city sits at an elevation of 9,498 feet.
Temperature
39°F Jan (4°C)
40°F Jul (4°C)
| Annual Average | 39.7°F |
| 26% below US avg | |
| January Average | 39°F (4°C) |
| July Average | 40°F (4°C) |
| Sunny Days | 356 days/yr |
Geography
| Elevation | 9,498 ft (2,895 m) |
| Area | 365.5 sq mi (946.7 km²) |
| Population Density | 2/sq mi |
| Coordinates | -14.6602°N, 74.2022°W |
| Timezone | America/Lima |
Precipitation & Snow
Air Quality
Earthquake History
427 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M7.2.
| Jun 28, 2024 | 10 km WSW of Atiquipa, Peru | M7.2 | 133 km | 24 km |
| Sep 25, 2013 | 16 km WSW of Atiquipa, Peru | M7.1 | 135 km | 40 km |
| Jan 14, 2018 | 37 km W of Atiquipa, Peru | M7.1 | 135 km | 39 km |
| Aug 24, 2014 | 38 km NW of Aniso, Peru | M6.8 | 68 km | 101 km |
| Apr 5, 1991 | 21 km ESE of Pampa de Tate, Peru | M6.3 | 149 km | 50 km |
| May 23, 2010 | 4 km WNW of Sacsamarca, Peru | M6.1 | 83 km | 101 km |
| Jun 16, 2024 | 10 km SW of Atiquipa, Peru | M6.0 | 135 km | 27 km |
| May 17, 2025 | 5 km W of San Pedro, Peru | M5.9 | 13 km | 101 km |
| May 3, 2005 | central Peru | M5.9 | 54 km | 31 km |
| Nov 15, 1996 | 30 km WSW of Changuillo, Peru | M5.8 | 138 km | 33 km |
| Sep 28, 2004 | 21 km WNW of Atiquipa, Peru | M5.8 | 120 km | 27 km |
| Jul 12, 2024 | 24 km SW of Acarí, Peru | M5.8 | 118 km | 23 km |
| Jun 28, 2007 | 41 km SW of Acarí, Peru | M5.8 | 135 km | 12 km |
| May 18, 2009 | 35 km SW of Acarí, Peru | M5.8 | 130 km | 23 km |
| Jan 25, 2019 | 15 km WNW of Llipata, Peru | M5.7 | 125 km | 61 km |
| Jan 12, 2001 | 27 km SW of Acarí, Peru | M5.7 | 121 km | 39 km |
| Jun 24, 2017 | 14 km NE of Cahuacho, Peru | M5.7 | 121 km | 97 km |
| May 24, 1994 | 24 km SSW of Acarí, Peru | M5.6 | 120 km | 34 km |
| May 8, 1991 | 15 km WSW of Carapo, Peru | M5.6 | 92 km | 107 km |
| Jun 29, 2007 | 51 km SW of Acarí, Peru | M5.6 | 146 km | 16 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Tsunami History
3 tsunamis recorded within 500 km. Highest wave on record: 0.2 m (1 ft).
| Year | Location | Cause | Max Wave | Deaths | Distance |
| 2024 | S. PERU | Earthquake | 0.2 m | — | 131 km |
| 2018 | S. PERU | Earthquake | 0.2 m | — | 135 km |
| 2013 | S. PERU | Earthquake | 0.1 m | — | 135 km |
Source: NOAA/NCEI Historical Tsunami Database.
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 39°F (4°C) | 6.5 in | Coldest |
| February | 48°F (9°C) | 5.9 in | |
| March | 48°F (9°C) | 7.1 in | Wettest |
| April | 47°F (8°C) | 1.8 in | |
| May | 45°F (7°C) | 0.8 in | |
| June | 43°F (6°C) | 0.2 in | |
| July | 40°F (4°C) | 0.2 in | Driest |
| August | 43°F (6°C) | 0.3 in | |
| September | 45°F (7°C) | 0.9 in | |
| October | 47°F (8°C) | 0.9 in | |
| November | 47°F (8°C) | 1.2 in | |
| December | 48°F (9°C) | 2.6 in | Warmest |
San Juan has a seasonal temperature swing of 9°F / from 39°F in January to 48°F in December. Total annual precipitation is 28.5 inches, with March being the wettest month (7.1") and July the driest (0.2").