La Unión, Mexico

Full City Profile

3,241 Population 4/sq mi density

210 ft Elevation 64 meters

79°F Avg Temperature 26°C

La Unión has a warm climate with an average annual temperature of 79°F (26°C). Winters average 77°F in January while summers reach 81°F in July. The area gets 267 sunny days per year. Annual precipitation totals 38.1 inches. The area receives 0.0 inches of snow annually.

Temperature

77°F Jan (25°C) 81°F Jul (27°C)

Annual Average	79.4°F
	47% above US avg
January Average	77°F (25°C)
July Average	81°F (27°C)
Sunny Days	267 days/yr

Geography

Elevation	210 ft (64 m)
Area	771.7 sq mi (1,998.8 km²)
Population Density	4/sq mi
Coordinates	17.9856°N, 101.8066°W
Timezone	America/Mexico_City

Precipitation & Snow

Annual Rainfall 38.1"

0% below US avg

Snowfall 0.0"

Wettest Month (Sep) 10.20"

Driest Month (Apr) 0.04"

Air Quality

Earthquake History

1,171 earthquakes (M2.5+) within 150 km since 1990. Strongest: M7.6. Most recent: M4.4 on Aug 11, 2025.

Sep 19, 2022	35 km SSW of Aguililla, Mexico	M7.6	132 km
Apr 18, 2014	9 km ENE of Coyuquilla Norte, Mexico	M7.2	110 km
Jan 11, 1997	46 km WNW of El Habillal, Mexico	M7.2	104 km
Jul 15, 1996	26 km NNE of Coyuquilla Norte, Mexico	M6.8	99 km
Apr 18, 2002	27 km SSW of Nuxco, Mexico	M6.8	150 km
Sep 22, 2022	55 km SSW of Aguililla, Mexico	M6.8	125 km
Dec 10, 1994	22 km SW of Guayameo, Mexico	M6.5	48 km
Aug 9, 2000	24 km NNW of El Habillal, Mexico	M6.5	75 km
Apr 11, 2012	41 km NW of El Habillal, Mexico	M6.5	97 km
May 22, 1997	5 km ENE of Churumuco de Morelos, Mexico	M6.5	81 km
May 8, 2014	3 km NNE of Nuxco, Mexico	M6.4	140 km
May 23, 1994	4 km W of San Cristóbal, Mexico	M6.3	137 km
Jun 21, 1999	20 km E of Coahuayutla de Guerrero, Mexico	M6.3	47 km
Jan 1, 2004	6 km SW of Petatlán, Mexico	M6.1	77 km
May 10, 2014	6 km W of Nuxco, Mexico	M6.0	136 km
May 31, 1990	7 km NE of Nuxco, Mexico	M6.0	142 km
Apr 22, 2013	7 km NNE of Guacamayas, Mexico	M6.0	41 km
Apr 20, 1998	17 km ENE of Aratichanguío, Mexico	M6.0	88 km
Apr 18, 2002	24 km WSW of Papanoa, Mexico	M5.9	102 km
Dec 29, 1999	19 km WSW of Guayameo, Mexico	M5.9	49 km

Source: USGS (M2.5+, 1990–2025)

Hurricane History

33 hurricanes (Cat 1+) within 500 km since 1980. Strongest: Category 5. Most recent: Erick (2025).

Year	Name	Category	Closest
2025	Flossie	Category 1	284 km
2025	Erick	Category 1	283 km
2024	John	Category 2	121 km
2023	Otis	Category 5	163 km
2023	Beatriz	Category 1	107 km
2021	Rick	Category 2	23 km
2019	Lorena	Category 1	232 km
2017	Max	Category 1	233 km
2015	Marty	Category 1	160 km
2015	Carlos	Category 1	160 km
2013	Raymond	Category 3	177 km
2013	Erick	Category 1	199 km
2011	Hilary	Category 4	216 km
2011	Beatriz	Category 1	161 km
2009	Andres	Category 1	160 km
2006	John	Category 4	154 km
1997	Pauline	Category 1	249 km
1996	Alma	Category 2	63 km
1996	Hernan	Category 1	115 km
1996	Boris	Category 1	26 km

Source: NOAA IBTrACS (Cat 1+, 1980–2026)

Tsunami History

11 tsunamis recorded within 500 km. Highest wave on record: 3.0 m (10 ft).

Year	Location	Cause	Max Wave	Deaths	Distance
1985	MEXICO	Earthquake	3.0 m	9,500	80 km
1979	S. MEXICO	Earthquake	1.3 m	5	59 km
1985	MEXICO	Earthquake	1.2 m	—	27 km
1973	S. MEXICO	Earthquake	1.1 m	56	138 km
2022	MEXICO	Earthquake	0.8 m	2	132 km
2014	S. MEXICO	Earthquake	0.4 m	—	110 km
2013	MEXICO	Earthquake	0.1 m	—	41 km
1981	MEXICO	Earthquake	0.1 m	3	31 km
2002	S. MEXICO	Earthquake	—	—	150 km
1941	MEXICO	Earthquake	—	84	147 km
1933	MEXICO	Earthquake	—	—	115 km

Source: NOAA/NCEI Historical Tsunami Database. Sorted by wave height.

Monthly Weather

Month	Avg Temperature	Precipitation	Summary
January	77°F (25°C)	0.8 in	Coldest
February	77°F (25°C)	0.1 in
March	77°F (25°C)	0.1 in
April	78°F (26°C)	0.0 in	Driest
May	81°F (27°C)	0.8 in
June	82°F (28°C)	6.4 in	Warmest
July	81°F (27°C)	7.3 in
August	81°F (27°C)	7.3 in
September	80°F (27°C)	10.2 in	Wettest
October	80°F (27°C)	4.3 in
November	79°F (26°C)	0.5 in
December	78°F (26°C)	0.4 in

La Unión has a seasonal temperature swing of 4°F / from 77°F in January to 82°F in June. Total annual precipitation is 38.1 inches, with September being the wettest month (10.2") and April the driest (0.0").

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