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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 79°F (26°C). Winters average 77°F in January while summers reach 81°F in July / relatively mild seasonal variation. The area gets 267 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 38.1 inches. The city sits at an elevation of 210 feet.
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
Air Quality
Earthquake History
1,171 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M7.6.
| Sep 19, 2022 | 35 km SSW of Aguililla, Mexico | M7.6 | 132 km | 27 km |
| Apr 18, 2014 | 9 km ENE of Coyuquilla Norte, Mexico | M7.2 | 110 km | 24 km |
| Jan 11, 1997 | 46 km WNW of El Habillal, Mexico | M7.2 | 104 km | 33 km |
| Jul 15, 1996 | 26 km NNE of Coyuquilla Norte, Mexico | M6.8 | 99 km | 18 km |
| Apr 18, 2002 | 27 km SSW of Nuxco, Mexico | M6.8 | 150 km | 25 km |
| Sep 22, 2022 | 55 km SSW of Aguililla, Mexico | M6.8 | 125 km | 20 km |
| Dec 10, 1994 | 22 km SW of Guayameo, Mexico | M6.5 | 48 km | 48 km |
| Aug 9, 2000 | 24 km NNW of El Habillal, Mexico | M6.5 | 75 km | 46 km |
| Apr 11, 2012 | 41 km NW of El Habillal, Mexico | M6.5 | 97 km | 20 km |
| May 22, 1997 | 5 km ENE of Churumuco de Morelos, Mexico | M6.5 | 81 km | 70 km |
| May 8, 2014 | 3 km NNE of Nuxco, Mexico | M6.4 | 140 km | 17 km |
| May 23, 1994 | 4 km W of San Cristóbal, Mexico | M6.3 | 137 km | 55 km |
| Jun 21, 1999 | 20 km E of Coahuayutla de Guerrero, Mexico | M6.3 | 47 km | 69 km |
| Jan 1, 2004 | 6 km SW of Petatlán, Mexico | M6.1 | 77 km | 29 km |
| May 10, 2014 | 6 km W of Nuxco, Mexico | M6.0 | 136 km | 23 km |
| May 31, 1990 | 7 km NE of Nuxco, Mexico | M6.0 | 142 km | 23 km |
| Apr 22, 2013 | 7 km NNE of Guacamayas, Mexico | M6.0 | 41 km | 30 km |
| Apr 20, 1998 | 17 km ENE of Aratichanguío, Mexico | M6.0 | 88 km | 67 km |
| Apr 18, 2002 | 24 km WSW of Papanoa, Mexico | M5.9 | 102 km | 33 km |
| Dec 29, 1999 | 19 km WSW of Guayameo, Mexico | M5.9 | 49 km | 70 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Hurricane History
33 hurricanes (Category 1+) recorded within 500 km since 1980. Strongest on record: Category 5.
| Year | Name | Category | Max Wind | Closest |
| 2025 | Flossie | Category 1 | 75 mph | 284 km |
| 2025 | Erick | Category 1 | 75 mph | 283 km |
| 2024 | John | Category 2 | 98 mph | 121 km |
| 2023 | Otis | Category 5 | 167 mph | 163 km |
| 2023 | Beatriz | Category 1 | 86 mph | 107 km |
| 2021 | Rick | Category 2 | 104 mph | 23 km |
| 2019 | Lorena | Category 1 | 81 mph | 232 km |
| 2017 | Max | Category 1 | 92 mph | 233 km |
| 2015 | Marty | Category 1 | 81 mph | 160 km |
| 2015 | Carlos | Category 1 | 92 mph | 160 km |
| 2013 | Raymond | Category 3 | 127 mph | 177 km |
| 2013 | Erick | Category 1 | 81 mph | 199 km |
| 2011 | Hilary | Category 4 | 144 mph | 216 km |
| 2011 | Beatriz | Category 1 | 92 mph | 161 km |
| 2009 | Andres | Category 1 | 81 mph | 160 km |
| 2006 | John | Category 4 | 132 mph | 154 km |
| 1997 | Pauline | Category 1 | 81 mph | 249 km |
| 1996 | Alma | Category 2 | 104 mph | 63 km |
| 1996 | Hernan | Category 1 | 86 mph | 115 km |
| 1996 | Boris | Category 1 | 92 mph | 26 km |
Source: NOAA IBTrACS (Category 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.
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").