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Weather & Climate in San Juan de Iris, Peru
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
San Juan de Iris has a cool climate with an average annual temperature of 36°F (2°C). Winters average 33°F in January while summers reach 37°F in July / relatively mild seasonal variation. The area gets 344 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 58.7 inches (wetter than the 38-inch national average). The area receives 273.9 inches of snow annually, making winter weather a significant factor for residents. The city sits at an elevation of 11,204 feet.
Temperature
33°F Jan (1°C)
37°F Jul (3°C)
| Annual Average | 35.9°F |
| 34% below US avg | |
| January Average | 33°F (1°C) |
| July Average | 37°F (3°C) |
| Sunny Days | 344 days/yr |
Geography
| Elevation | 11,204 ft (3,415 m) |
| Area | 94.8 sq mi (245.5 km²) |
| Population Density | 11/sq mi |
| Coordinates | -11.6832°N, 76.5250°W |
| Timezone | America/Lima |
Precipitation & Snow
Air Quality
Earthquake History
193 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M6.3.
| Apr 18, 1993 | 15 km SE of Lachaqui, Peru | M6.3 | 4 km | 106 km |
| Jun 23, 2021 | 11 km WSW of Mala, Peru | M5.9 | 116 km | 50 km |
| Apr 29, 1991 | 18 km SSW of Huacho, Peru | M5.9 | 134 km | 58 km |
| Jun 15, 2025 | 37 km WSW of Callao, Peru | M5.6 | 114 km | 40 km |
| May 28, 2003 | 33 km SSW of Santiago de Surco, Peru | M5.6 | 106 km | 43 km |
| Oct 1, 1996 | 19 km SSW of Chilca, Peru | M5.6 | 115 km | 62 km |
| Oct 4, 1999 | 21 km ENE of Paucartambo, Peru | M5.6 | 148 km | 33 km |
| Jan 7, 2022 | 6 km NW of Cocachacra, Peru | M5.6 | 21 km | 96 km |
| Jun 21, 1995 | 28 km W of Chancay, Peru | M5.6 | 111 km | 71 km |
| Nov 25, 2013 | 12 km SE of Omas, Peru | M5.5 | 108 km | 77 km |
| May 12, 2022 | 9 km W of San Bartolo, Peru | M5.4 | 86 km | 53 km |
| Feb 17, 2005 | 7 km W of Carhuamayo, Peru | M5.4 | 96 km | 126 km |
| Dec 25, 1998 | 9 km SE of Chancay, Peru | M5.4 | 75 km | 67 km |
| Mar 29, 2008 | 14 km SSW of Callao, Peru | M5.3 | 89 km | 51 km |
| Mar 18, 1999 | 21 km NNE of Huancaya, Peru | M5.3 | 98 km | 116 km |
| Mar 20, 1998 | 54 km W of Callao, Peru | M5.2 | 128 km | 49 km |
| Jul 18, 2016 | 17 km SW of Caleta de Carquín, Peru | M5.2 | 142 km | 75 km |
| Jun 3, 2014 | 20 km W of Chilca, Peru | M5.2 | 102 km | 36 km |
| Feb 15, 2024 | 13 km NW of Chancay, Peru | M5.2 | 93 km | 67 km |
| May 17, 2018 | 7 km E of Mala, Peru | M5.2 | 110 km | 56 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Tsunami History
7 tsunamis recorded within 500 km. Highest wave on record: 30.0 m (98 ft).
| Year | Location | Cause | Max Wave | Deaths | Distance |
| 1971 | CHUNGAR | Meteorological | 30.0 m | 600 | 62 km |
| 1586 | CENTRAL PERU | Earthquake | 26.0 m | 22 | 145 km |
| 1746 | CENTRAL PERU | Earthquake | 24.0 m | 5,941 | 81 km |
| 1865 | CENTRAL PERU | Earthquake | 2.0 m | 5 | 72 km |
| 1806 | CENTRAL PERU | Earthquake | 1.0 m | — | 78 km |
| 1878 | CENTRAL PERU | Unknown | — | 5 | 63 km |
| 1860 | CENTRAL PERU | Earthquake | — | — | 78 km |
Source: NOAA/NCEI Historical Tsunami Database.
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 33°F (1°C) | 3.3 in | Coldest |
| February | 49°F (9°C) | 4.7 in | Warmest |
| March | 48°F (9°C) | 5.0 in | Wettest |
| April | 47°F (9°C) | 1.8 in | |
| May | 45°F (7°C) | 0.2 in | |
| June | 43°F (6°C) | 0.0 in | Driest |
| July | 37°F (3°C) | 0.0 in | |
| August | 43°F (6°C) | 0.1 in | |
| September | 44°F (7°C) | 0.4 in | |
| October | 46°F (8°C) | 0.9 in | |
| November | 47°F (8°C) | 0.9 in | |
| December | 48°F (9°C) | 2.2 in |
San Juan de Iris has a seasonal temperature swing of 16°F / from 33°F in January to 49°F in February. Total annual precipitation is 19.5 inches, with March being the wettest month (5.0") and June the driest (0.0").