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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 66°F (19°C). Winters average 72°F in January while summers reach 61°F in July / relatively mild seasonal variation. The area gets 336 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 0.1 inches (drier than the 38-inch national average). The city sits at an elevation of 75 feet.
Temperature
72°F Jan (22°C)
61°F Jul (16°C)
| Annual Average | 66.4°F |
| 23% above US avg | |
| January Average | 72°F (22°C) |
| July Average | 61°F (16°C) |
| Sunny Days | 336 days/yr |
Geography
| Elevation | 75 ft (23 m) |
| Area | 1,064.2 sq mi (2,756.2 km²) |
| Population Density | 12/sq mi |
| Coordinates | -15.3653°N, 75.1622°W |
| Timezone | America/Lima |
Precipitation & Snow
Air Quality
Earthquake History
648 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M7.7.
| Nov 12, 1996 | 60 km SW of Changuillo, Peru | M7.7 | 69 km | 33 km |
| Jun 28, 2024 | 10 km WSW of Atiquipa, Peru | M7.2 | 92 km | 24 km |
| Sep 25, 2013 | 16 km WSW of Atiquipa, Peru | M7.1 | 87 km | 40 km |
| Jan 14, 2018 | 37 km W of Atiquipa, Peru | M7.1 | 66 km | 39 km |
| Jul 5, 2001 | 31 km S of Achanizo, Peru | M6.6 | 149 km | 62 km |
| Jan 30, 2012 | 6 km ESE of Pampa de Tate, Peru | M6.4 | 143 km | 43 km |
| Apr 5, 1991 | 21 km ESE of Pampa de Tate, Peru | M6.3 | 132 km | 50 km |
| Jun 29, 2024 | 34 km SW of Atiquipa, Peru | M6.1 | 100 km | 18 km |
| Nov 13, 1996 | 54 km WSW of Changuillo, Peru | M6.1 | 81 km | 33 km |
| Nov 13, 1996 | 29 km WSW of San Juan, Peru | M6.0 | 30 km | 33 km |
| Jun 16, 2024 | 10 km SW of Atiquipa, Peru | M6.0 | 95 km | 27 km |
| Jul 1, 1991 | 50 km SSE of San Juan, Peru | M6.0 | 51 km | 21 km |
| May 3, 2005 | central Peru | M5.9 | 76 km | 31 km |
| May 17, 2025 | 5 km W of San Pedro, Peru | M5.9 | 128 km | 101 km |
| Feb 18, 2014 | 10 km ESE of Pampa de Tate, Peru | M5.9 | 142 km | 57 km |
| May 18, 2009 | 35 km SW of Acarí, Peru | M5.8 | 48 km | 23 km |
| Jun 28, 2007 | 41 km SW of Acarí, Peru | M5.8 | 45 km | 12 km |
| Sep 28, 2004 | 21 km WNW of Atiquipa, Peru | M5.8 | 77 km | 27 km |
| Jun 29, 2015 | 27 km SSE of Atiquipa, Peru | M5.8 | 122 km | 28 km |
| Jul 12, 2024 | 24 km SW of Acarí, Peru | M5.8 | 44 km | 23 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Tsunami History
5 tsunamis recorded within 500 km. Highest wave on record: 2.0 m (7 ft).
| Year | Location | Cause | Max Wave | Deaths | Distance |
| 1942 | S. PERU | Eruption + Earthquake | 2.0 m | 30 | 99 km |
| 1996 | S. PERU | Earthquake | 0.4 m | 14 | 69 km |
| 2024 | S. PERU | Earthquake | 0.2 m | — | 91 km |
| 2018 | S. PERU | Earthquake | 0.2 m | — | 66 km |
| 2013 | S. PERU | Earthquake | 0.1 m | — | 87 km |
Source: NOAA/NCEI Historical Tsunami Database.
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 72°F (22°C) | 0.0 in | Wettest |
| February | 73°F (23°C) | 0.0 in | Warmest, Driest |
| March | 72°F (22°C) | 0.0 in | |
| April | 70°F (21°C) | 0.0 in | |
| May | 66°F (19°C) | 0.0 in | |
| June | 63°F (17°C) | 0.0 in | |
| July | 61°F (16°C) | 0.0 in | |
| August | 61°F (16°C) | 0.0 in | Coldest |
| September | 61°F (16°C) | 0.0 in | |
| October | 64°F (18°C) | 0.0 in | |
| November | 66°F (19°C) | 0.0 in | |
| December | 70°F (21°C) | 0.0 in |
San Juan has a seasonal temperature swing of 13°F / from 61°F in August to 73°F in February. Total annual precipitation is 0.1 inches, with January being the wettest month (0.0") and February the driest (0.0").