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Weather & Climate in La Unión, El Salvador
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
La Unión has a warm climate with an average annual temperature of 81°F (27°C). Winters average 80°F in January while summers reach 81°F in July / relatively mild seasonal variation. The area gets 214 sunny days per year. Annual precipitation totals 69.8 inches (wetter than the 38-inch national average). The city sits at an elevation of 33 feet.
Temperature
80°F Jan (27°C)
81°F Jul (27°C)
| Annual Average | 80.5°F |
| 49% above US avg | |
| January Average | 80°F (27°C) |
| July Average | 81°F (27°C) |
| Sunny Days | 214 days/yr |
Geography
| Elevation | 33 ft (10 m) |
| Area | 55.8 sq mi (144.4 km²) |
| Population Density | 481/sq mi |
| Coordinates | 13.3392°N, 87.8433°W |
| Timezone | America/El_Salvador |
Precipitation & Snow
Air Quality
Earthquake History
1,706 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M7.7.
| Jan 13, 2001 | 28 km SSW of Puerto El Triunfo, El Salvador | M7.7 | 94 km | 60 km |
| Feb 13, 2001 | 5 km S of Cojutepeque, El Salvador | M6.6 | 124 km | 10 km |
| Jun 14, 1995 | 120 km SW of Jiquilillo, Nicaragua | M6.6 | 146 km | 25 km |
| Nov 9, 1997 | 13 km NNE of San Sebastián, El Salvador | M6.5 | 119 km | 176 km |
| Jul 19, 2023 | 43 km S of Intipucá, El Salvador | M6.5 | 65 km | 71 km |
| Jan 5, 2025 | 56 km SSE of La Libertad, El Salvador | M6.2 | 149 km | 46 km |
| Mar 2, 2014 | 33 km SW of Jiquilillo, Nicaragua | M6.2 | 89 km | 60 km |
| Jun 10, 2016 | Nicaragua | M6.1 | 111 km | 10 km |
| Dec 18, 1997 | 11 km WSW of Sensuntepeque, El Salvador | M6.1 | 112 km | 182 km |
| Feb 28, 2001 | 24 km S of Zacatecoluca, El Salvador | M6.1 | 107 km | 65 km |
| Apr 3, 1999 | 13 km S of Amapala, Honduras | M6.0 | 29 km | 38 km |
| Mar 16, 2001 | 22 km SW of Puerto El Triunfo, El Salvador | M5.9 | 95 km | 49 km |
| May 16, 2019 | 41 km WSW of Jiquilillo, Nicaragua | M5.9 | 77 km | 72 km |
| Jun 12, 1993 | 14 km ESE of Amapala, Honduras | M5.9 | 36 km | 218 km |
| Apr 2, 2018 | 24 km SW of Puerto El Triunfo, El Salvador | M5.9 | 94 km | 50 km |
| Feb 7, 2001 | 32 km SSW of Zacatecoluca, El Salvador | M5.8 | 120 km | 64 km |
| Jan 15, 2001 | 23 km S of Puerto El Triunfo, El Salvador | M5.8 | 85 km | 75 km |
| Mar 29, 2001 | 46 km SW of Jiquilisco, El Salvador | M5.8 | 122 km | 33 km |
| May 8, 2001 | 3 km S of San Vicente, El Salvador | M5.7 | 107 km | 10 km |
| Feb 2, 2001 | 68 km SW of Puerto El Triunfo, El Salvador | M5.7 | 135 km | 54 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Hurricane History
2 hurricanes (Category 1+) recorded within 500 km since 1980. Strongest on record: Category 1.
| Year | Name | Category | Max Wind | Closest |
| 2020 | Iota | Category 1 | — | 289 km |
| 2005 | Adrian | Category 1 | 81 mph | 282 km |
Source: NOAA IBTrACS (Category 1+, 1980–2026).
Tsunami History
4 tsunamis recorded within 500 km. Highest wave on record: 0.3 m (1 ft).
| Year | Location | Cause | Max Wave | Deaths | Distance |
| 2001 | EL SALVADOR | Earthquake | 0.3 m | 844 | 94 km |
| 2014 | GULF OF FONSECA | Earthquake | 0.0 m | 1 | 95 km |
| 1919 | GULF OF FONSECA | Earthquake | — | — | 124 km |
| 1859 | EL SALVADOR | Earthquake | — | — | 4 km |
Source: NOAA/NCEI Historical Tsunami Database.
Nearby Volcanoes
15 volcanoes within 200 km. Closest: Tigre, Isla el (23 km).
| Name | Type | Elevation | Last Eruption | Distance |
| Tigre, Isla el | Stratovolcano | 783 m (2,569 ft) | Unknown | 23 km |
| Zacate Grande, Isla | Stratovolcano | 640 m (2,100 ft) | Unknown | 23 km |
| Cosiguina | Stratovolcano | 872 m (2,861 ft) | 1859 | 50 km |
| Chinameca | Stratovolcano | 1,300 m (4,265 ft) | Unknown | 55 km |
| Tigre, El | Stratovolcano | 1,640 m (5,381 ft) | Unknown | 65 km |
| Usulutan | Stratovolcano | 1,449 m (4,754 ft) | Unknown | 69 km |
| Tecapa | Stratovolcano | 1,593 m (5,226 ft) | Unknown | 73 km |
| Taburete | Stratovolcano | 1,172 m (3,845 ft) | Unknown | 75 km |
| Apastepeque Field | Volcanic field | 700 m (2,297 ft) | Unknown | 109 km |
| San Vicente | Stratovolcano | 2,182 m (7,159 ft) | Unknown | 111 km |
| San Cristobal | Stratovolcano | 1,745 m (5,725 ft) | 2019 | 115 km |
| Ilopango | Caldera | 450 m (1,476 ft) | 1880 | 136 km |
| Telica | Stratovolcano(es) | 1,036 m (3,399 ft) | 2018 | 136 km |
| Rota | Stratovolcano | 832 m (2,730 ft) | Unknown | 147 km |
| Guazapa | Stratovolcano | 1,438 m (4,718 ft) | Unknown | 151 km |
Source: Smithsonian Institution Global Volcanism Program (GVP).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 80°F (27°C) | 0.1 in | |
| February | 81°F (27°C) | 0.1 in | Driest |
| March | 82°F (28°C) | 0.3 in | |
| April | 84°F (29°C) | 1.3 in | Warmest |
| May | 82°F (28°C) | 8.5 in | |
| June | 80°F (27°C) | 12.4 in | |
| July | 81°F (27°C) | 8.0 in | |
| August | 81°F (27°C) | 9.7 in | |
| September | 79°F (26°C) | 15.2 in | Wettest |
| October | 78°F (26°C) | 12.0 in | Coldest |
| November | 79°F (26°C) | 1.9 in | |
| December | 79°F (26°C) | 0.2 in |
La Unión has a seasonal temperature swing of 5°F / from 78°F in October to 84°F in April. Total annual precipitation is 69.8 inches, with September being the wettest month (15.2") and February the driest (0.1").