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Weather & Climate in San Juan, Peru
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
San Juan has a warm climate with an average annual temperature of 79°F (26°C). Winters average 79°F in January while summers reach 78°F in July / relatively mild seasonal variation. The area gets 138 sunny days per year, below the national average of 205. Annual precipitation totals 109.1 inches (wetter than the 38-inch national average). The city sits at an elevation of 325 feet.
Temperature
79°F Jan (26°C)
78°F Jul (25°C)
| Annual Average | 79.1°F |
| 46% above US avg | |
| January Average | 79°F (26°C) |
| July Average | 78°F (25°C) |
| Sunny Days | 138 days/yr |
Geography
| Elevation | 325 ft (99 m) |
| Area | 1,949.0 sq mi (5,047.8 km²) |
| Population Density | 40/sq mi |
| Coordinates | -3.7761°N, 73.2814°W |
| Timezone | America/Lima |
Precipitation & Snow
Air Quality
Earthquake History
4 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M5.2.
| Jan 8, 2019 | 48 km WSW of Nauta, Peru | M5.2 | 123 km | 10 km |
| Jul 6, 2004 | 75 km NE of Iquitos, Peru | M4.6 | 80 km | 10 km |
| Mar 21, 2001 | 125 km W of San Juan, Peru | M4.3 | 126 km | 60 km |
| Aug 9, 2017 | 83 km W of San Juan, Peru | M4.2 | 84 km | 10 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 79°F (26°C) | 11.1 in | |
| February | 80°F (26°C) | 9.5 in | |
| March | 79°F (26°C) | 10.9 in | |
| April | 79°F (26°C) | 11.7 in | Wettest |
| May | 79°F (26°C) | 10.2 in | |
| June | 78°F (26°C) | 7.3 in | |
| July | 78°F (25°C) | 5.8 in | Coldest, Driest |
| August | 78°F (26°C) | 6.3 in | |
| September | 79°F (26°C) | 7.2 in | |
| October | 80°F (27°C) | 8.7 in | |
| November | 80°F (27°C) | 9.5 in | Warmest |
| December | 80°F (27°C) | 10.9 in |
San Juan has a seasonal temperature swing of 2°F / from 78°F in July to 80°F in November. Total annual precipitation is 109.1 inches, with April being the wettest month (11.7") and July the driest (5.8").