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Weather & Climate in San Juan, Costa Rica
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
San Juan enjoys a temperate climate with an average annual temperature of 68°F (20°C). Winters average 67°F in January while summers reach 69°F in July / relatively mild seasonal variation. The area gets 171 sunny days per year. Annual precipitation totals 98.4 inches (wetter than the 38-inch national average). The city sits at an elevation of 3,576 feet.
Temperature
67°F Jan (20°C)
69°F Jul (20°C)
| Annual Average | 68.2°F |
| 26% above US avg | |
| January Average | 67°F (20°C) |
| July Average | 69°F (20°C) |
| Sunny Days | 171 days/yr |
Geography
| Elevation | 3,576 ft (1,090 m) |
| Area | 29.0 sq mi (75.1 km²) |
| Population Density | 267/sq mi |
| Coordinates | 10.1025°N, 84.3169°W |
| Timezone | America/Costa_Rica |
Precipitation & Snow
Air Quality
Earthquake History
615 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M7.6.
| Sep 5, 2012 | 11 km ENE of Hojancha, Costa Rica | M7.6 | 109 km | 35 km |
| Apr 22, 1991 | 34 km S of Limón, Costa Rica | M7.6 | 144 km | 10 km |
| Mar 25, 1990 | 7 km SSE of Puntarenas, Costa Rica | M7.3 | 58 km | 22 km |
| Aug 20, 1999 | 42 km S of Quepos, Costa Rica | M6.9 | 119 km | 20 km |
| Mar 7, 1992 | 5 km SW of Río Segundo, Costa Rica | M6.6 | 12 km | 79 km |
| Oct 24, 2012 | Costa Rica | M6.5 | 107 km | 17 km |
| Jul 21, 2000 | 55 km SSE of Sámara, Costa Rica | M6.4 | 135 km | 33 km |
| Mar 25, 1990 | 11 km E of Paquera, Costa Rica | M6.4 | 65 km | 27 km |
| Mar 16, 1991 | 15 km N of Nandayure, Costa Rica | M6.3 | 95 km | 33 km |
| Sep 4, 1996 | 13 km WSW of Quepos, Costa Rica | M6.2 | 82 km | 33 km |
| Mar 1, 1991 | 13 km SE of Los Chiles, Costa Rica | M6.2 | 99 km | 197 km |
| Apr 24, 1991 | 16 km SE of La Suiza, Costa Rica | M6.2 | 96 km | 13 km |
| Jan 8, 2009 | 10 km NNE of Sabanilla, Costa Rica | M6.1 | 15 km | 14 km |
| Dec 22, 1990 | 2 km NNE of Santiago, Costa Rica | M6.0 | 26 km | 17 km |
| Jun 1, 2010 | 12 km SSW of Quepos, Costa Rica | M6.0 | 87 km | 18 km |
| Feb 13, 2012 | 27 km S of Quepos, Costa Rica | M5.9 | 105 km | 16 km |
| May 20, 2010 | 25 km SW of Quepos, Costa Rica | M5.9 | 95 km | 21 km |
| May 13, 2011 | 7 km ESE of Atenas, Costa Rica | M5.9 | 17 km | 73 km |
| Aug 28, 1996 | 15 km S of Parrita, Costa Rica | M5.9 | 80 km | 33 km |
| Aug 21, 1999 | 45 km W of Ciudad Cortés, Costa Rica | M5.8 | 138 km | 24 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Hurricane History
5 hurricanes (Category 1+) recorded within 500 km since 1980. Strongest on record: Category 4.
| Year | Name | Category | Max Wind | Closest |
| 2022 | Julia | Category 1 | 86 mph | 248 km |
| 2016 | Otto | Category 3 | 115 mph | 100 km |
| 2009 | Ida | Category 1 | 75 mph | 299 km |
| 1996 | Cesar | Category 1 | 86 mph | 236 km |
| 1988 | Joan:miriam | Category 4 | 144 mph | 200 km |
Source: NOAA IBTrACS (Category 1+, 1980–2026).
Tsunami History
8 tsunamis recorded within 500 km. Highest wave on record: 3.0 m (10 ft).
| Year | Location | Cause | Max Wave | Deaths | Distance |
| 1991 | LIMON, PANDORA | Earthquake | 3.0 m | 90 | 144 km |
| 1950 | COSTA RICA-NICARAGUA | Earthquake | 2.0 m | — | 125 km |
| 1990 | COSTA RICA | Earthquake | 1.0 m | — | 53 km |
| 2012 | COSTA RICA | Earthquake | 0.2 m | 2 | 109 km |
| 1952 | COSTA RICA-PANAMA | Earthquake | 0.1 m | — | 98 km |
| 2019 | IRAZU VOLCANO | Explosion | — | — | 53 km |
| 1924 | COSTA RICA | Earthquake | — | — | 61 km |
| 1905 | GULF OF NICOYA | Earthquake | — | — | 49 km |
Source: NOAA/NCEI Historical Tsunami Database.
Nearby Volcanoes
10 volcanoes within 200 km. Closest: Poas (14 km).
| Name | Type | Elevation | Last Eruption | Distance |
| Poas | Stratovolcano | 2,708 m (8,885 ft) | 2019 | 14 km |
| Platanar | Stratovolcano(es) | 2,267 m (7,438 ft) | Unknown | 23 km |
| Barva | Complex | 2,906 m (9,534 ft) | -6050 | 24 km |
| Irazu | Stratovolcano | 3,432 m (11,260 ft) | 1994 | 53 km |
| Arenal | Stratovolcano | 1,670 m (5,479 ft) | 2010 | 58 km |
| Turrialba | Stratovolcano | 3,340 m (10,958 ft) | 2019 | 61 km |
| Tenorio | Stratovolcano(es) | 1,916 m (6,286 ft) | Unknown | 99 km |
| Miravalles | Stratovolcano | 2,028 m (6,654 ft) | 1946 | 116 km |
| Rincon de la Vieja | Complex | 1,916 m (6,286 ft) | 2020 | 137 km |
| Orosi | Stratovolcano(es) | 1,659 m (5,443 ft) | Unknown | 160 km |
Source: Smithsonian Institution Global Volcanism Program (GVP).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 67°F (20°C) | 0.9 in | Driest |
| February | 68°F (20°C) | 1.1 in | |
| March | 69°F (21°C) | 1.3 in | |
| April | 70°F (21°C) | 4.2 in | Warmest |
| May | 70°F (21°C) | 11.1 in | |
| June | 68°F (20°C) | 13.6 in | |
| July | 69°F (20°C) | 10.5 in | |
| August | 68°F (20°C) | 13.1 in | |
| September | 68°F (20°C) | 15.8 in | Wettest |
| October | 67°F (20°C) | 15.8 in | |
| November | 67°F (19°C) | 8.0 in | |
| December | 67°F (19°C) | 3.0 in | Coldest |
San Juan has a seasonal temperature swing of 4°F / from 67°F in December to 70°F in April. Total annual precipitation is 98.4 inches, with September being the wettest month (15.8") and January the driest (0.9").