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Weather & Climate in La Unión, Mexico
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 79°F in January while summers reach 82°F in July / relatively mild seasonal variation. The area gets 360 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 83.6 inches (wetter than the 38-inch national average). The city sits at an elevation of 56 feet.
Temperature
79°F Jan (26°C)
82°F Jul (28°C)
| Annual Average | 81.3°F |
| 51% above US avg | |
| January Average | 79°F (26°C) |
| July Average | 82°F (28°C) |
| Sunny Days | 360 days/yr |
Geography
| Elevation | 56 ft (17 m) |
| Area | 325.6 sq mi (843.3 km²) |
| Population Density | 3/sq mi |
| Coordinates | 15.0553°N, 92.5108°W |
| Timezone | America/Mexico_City |
Precipitation & Snow
Air Quality
Earthquake History
2,699 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M8.2.
| Sep 8, 2017 | 2017 Tehuantepec, Mexico Earthquake | M8.2 | 149 km | 47 km |
| Nov 7, 2012 | 33 km S of Champerico, Guatemala | M7.4 | 136 km | 24 km |
| Sep 10, 1993 | 24 km W of Puerto Madero, Mexico | M7.2 | 40 km | 34 km |
| Jul 7, 2014 | 4 km W of Puerto Madero, Mexico | M6.9 | 37 km | 53 km |
| Mar 14, 1994 | 6 km ENE of Rizo de Oro, Mexico | M6.9 | 105 km | 164 km |
| Jun 14, 2017 | 2 km SSW of San Pablo, Guatemala | M6.9 | 56 km | 93 km |
| Sep 3, 1993 | 38 km SW of Puerto Madero, Mexico | M6.8 | 63 km | 27 km |
| Feb 1, 2019 | 5 km SW of Puerto Madero, Mexico | M6.7 | 42 km | 66 km |
| Jan 10, 1998 | 10 km SSW of San José El Ídolo, Guatemala | M6.6 | 135 km | 33 km |
| Nov 11, 2012 | 32 km SW of Champerico, Guatemala | M6.5 | 110 km | 20 km |
| Nov 28, 2001 | 2 km ESE of El Carmen, Mexico | M6.4 | 86 km | 85 km |
| Sep 7, 2013 | 7 km ESE of Ignacio López Rayón, Mexico | M6.4 | 65 km | 66 km |
| May 12, 2024 | 28 km WSW of Brisas Barra de Suchiate, Mexico | M6.4 | 70 km | 62 km |
| Sep 19, 1993 | 105 km WSW of Puerto Madero, Mexico | M6.4 | 117 km | 18 km |
| Dec 31, 1996 | 4 km SW of El Ramal (Porvenir), Mexico | M6.4 | 99 km | 100 km |
| Jan 16, 2002 | 2 km SW of Las Brisas, Mexico | M6.4 | 83 km | 80 km |
| Mar 12, 2000 | 3 km ESE of Plan de Ayala, Mexico | M6.3 | 12 km | 62 km |
| May 30, 1992 | 62 km WSW of Puerto Madero, Mexico | M6.3 | 82 km | 55 km |
| Jan 21, 2012 | 46 km SW of El Arenal, Mexico | M6.2 | 57 km | 45 km |
| May 8, 1999 | 9 km SSW of Champerico, Guatemala | M6.1 | 112 km | 39 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Hurricane History
4 hurricanes (Category 1+) recorded within 500 km since 1980. Strongest on record: Category 4.
| Year | Name | Category | Max Wind | Closest |
| 2013 | Barbara | Category 1 | 81 mph | 191 km |
| 1998 | Lester | Category 2 | 92 mph | 224 km |
| 1997 | Pauline | Category 4 | 132 mph | 291 km |
| 1996 | Douglas | Category 1 | 75 mph | 217 km |
Source: NOAA IBTrACS (Category 1+, 1980–2026).
Tsunami History
4 tsunamis recorded within 500 km. Highest wave on record: 4.0 m (13 ft).
| Year | Location | Cause | Max Wave | Deaths | Distance |
| 2005 | LAGO DE ATITLAN | Meteorological | 4.0 m | — | 144 km |
| 2017 | S. MEXICO | Earthquake | 2.7 m | 98 | 149 km |
| 2012 | GUATEMALA | Earthquake | 0.4 m | 48 | 136 km |
| 1950 | GUATEMALA | Earthquake | 0.2 m | — | 105 km |
Source: NOAA/NCEI Historical Tsunami Database.
Nearby Volcanoes
6 volcanoes within 200 km. Closest: Tacana (44 km).
| Name | Type | Elevation | Last Eruption | Distance |
| Tacana | Stratovolcano | 4,064 m (13,333 ft) | 1986 | 44 km |
| Santa Maria | Stratovolcano | 3,745 m (12,287 ft) | 2020 | 108 km |
| Almolonga | Stratovolcano | 3,173 m (10,410 ft) | 1818 | 110 km |
| Toliman | Stratovolcano(es) | 3,158 m (10,361 ft) | Unknown | 150 km |
| Acatenango | Stratovolcano(es) | 3,976 m (13,045 ft) | 1972 | 186 km |
| Fuego | Stratovolcano(es) | 3,763 m (12,346 ft) | 2020 | 187 km |
Source: Smithsonian Institution Global Volcanism Program (GVP).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 79°F (26°C) | 0.1 in | Coldest, Driest |
| February | 80°F (27°C) | 0.2 in | |
| March | 82°F (28°C) | 0.5 in | |
| April | 84°F (29°C) | 1.5 in | Warmest |
| May | 84°F (29°C) | 7.2 in | |
| June | 82°F (28°C) | 12.6 in | |
| July | 82°F (28°C) | 10.9 in | |
| August | 82°F (28°C) | 11.0 in | |
| September | 81°F (27°C) | 15.9 in | Wettest |
| October | 82°F (28°C) | 9.8 in | |
| November | 81°F (27°C) | 2.5 in | |
| December | 80°F (27°C) | 0.4 in |
La Unión has a seasonal temperature swing of 6°F / from 79°F in January to 84°F in April. Total annual precipitation is 72.7 inches, with September being the wettest month (15.9") and January the driest (0.1").