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La Unión, Mexico

Full City Profile

921 Population 3/sq mi density
56 ft Elevation 17 meters
81°F Avg Temperature 27°C
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. The area gets 360 sunny days per year. Annual precipitation totals 83.6 inches. The area receives 0.0 inches of snow annually.

Temperature

79°F Jan (26°C) 82°F Jul (28°C)
Annual Average81.3°F
51% above US avg
January Average79°F (26°C)
July Average82°F (28°C)
Sunny Days360 days/yr

Geography

Elevation56 ft (17 m)
Area325.6 sq mi (843.3 km²)
Population Density3/sq mi
Coordinates15.0553°N, 92.5108°W
TimezoneAmerica/Mexico_City

Precipitation & Snow

Annual Rainfall 83.6"
120% above US avg
Snowfall 0.0"
Wettest Month (Sep) 15.94"
Driest Month (Jan) 0.08"

Air Quality

Earthquake History

2,699 earthquakes (M2.5+) within 150 km since 1990. Strongest: M8.2. Most recent: M4.2 on Aug 27, 2025.

Sep 8, 2017 2017 Tehuantepec, Mexico Earthquake M8.2 149 km
Nov 7, 2012 33 km S of Champerico, Guatemala M7.4 136 km
Sep 10, 1993 24 km W of Puerto Madero, Mexico M7.2 40 km
Jul 7, 2014 4 km W of Puerto Madero, Mexico M6.9 37 km
Mar 14, 1994 6 km ENE of Rizo de Oro, Mexico M6.9 105 km
Jun 14, 2017 2 km SSW of San Pablo, Guatemala M6.9 56 km
Sep 3, 1993 38 km SW of Puerto Madero, Mexico M6.8 63 km
Feb 1, 2019 5 km SW of Puerto Madero, Mexico M6.7 42 km
Jan 10, 1998 10 km SSW of San José El Ídolo, Guatemala M6.6 135 km
Nov 11, 2012 32 km SW of Champerico, Guatemala M6.5 110 km
Nov 28, 2001 2 km ESE of El Carmen, Mexico M6.4 86 km
Sep 7, 2013 7 km ESE of Ignacio López Rayón, Mexico M6.4 65 km
May 12, 2024 28 km WSW of Brisas Barra de Suchiate, Mexico M6.4 70 km
Sep 19, 1993 105 km WSW of Puerto Madero, Mexico M6.4 117 km
Dec 31, 1996 4 km SW of El Ramal (Porvenir), Mexico M6.4 99 km
Jan 16, 2002 2 km SW of Las Brisas, Mexico M6.4 83 km
Mar 12, 2000 3 km ESE of Plan de Ayala, Mexico M6.3 12 km
May 30, 1992 62 km WSW of Puerto Madero, Mexico M6.3 82 km
Jan 21, 2012 46 km SW of El Arenal, Mexico M6.2 57 km
May 8, 1999 9 km SSW of Champerico, Guatemala M6.1 112 km
Source: USGS (M2.5+, 1990–2025)

Hurricane History

4 hurricanes (Cat 1+) within 500 km since 1980. Strongest: Category 4. Most recent: Barbara (2013).

Year Name Category Closest
2013 Barbara Category 1 191 km
1998 Lester Category 2 224 km
1997 Pauline Category 4 291 km
1996 Douglas Category 1 217 km
Source: NOAA IBTrACS (Cat 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. Sorted by wave height.

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). Sorted by distance.

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").

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