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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 72°F (22°C). Winters average 65°F in January while summers reach 77°F in July / relatively mild seasonal variation. The area gets 299 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 56.5 inches (wetter than the 38-inch national average). The city sits at an elevation of 2,136 feet.
Temperature
65°F Jan (19°C)
77°F Jul (25°C)
| Annual Average | 71.7°F |
| 33% above US avg | |
| January Average | 65°F (19°C) |
| July Average | 77°F (25°C) |
| Sunny Days | 299 days/yr |
Geography
| Elevation | 2,136 ft (651 m) |
| Area | 176.1 sq mi (456.0 km²) |
| Population Density | 9/sq mi |
| Coordinates | 20.2618°N, 97.8714°W |
| Timezone | America/Mexico_City |
Precipitation & Snow
Air Quality
Earthquake History
71 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M4.7.
| Feb 8, 2016 | 5 km WSW of Atecax, Mexico | M4.7 | 80 km | 10 km |
| Sep 3, 2013 | Gulf of America | M4.3 | 120 km | 17 km |
| Mar 12, 2000 | 1 km SE of Teocalco, Mexico | M4.1 | 147 km | 5 km |
| Jan 21, 2002 | 2 km S of El Carmen, Mexico | M4.1 | 136 km | 97 km |
| Mar 21, 1998 | 8 km W of San Mateo Ozolco, Mexico | M4.1 | 149 km | 5 km |
| Sep 28, 2011 | Gulf of America | M4.1 | 140 km | 23 km |
| Sep 21, 1998 | 1 km W of San Mateo Ozolco, Mexico | M4.0 | 147 km | 1 km |
| Nov 3, 2002 | 8 km SW of José María Morelos, Mexico | M4.0 | 113 km | 5 km |
| Apr 17, 2010 | 5 km SSE of Pozuelos, Mexico | M4.0 | 124 km | 2 km |
| Aug 7, 2005 | 2 km W of San Isidro, Mexico | M4.0 | 94 km | 5 km |
| Sep 23, 2013 | 2 km ENE of Chilcuautla, Mexico | M4.0 | 139 km | 5 km |
| Sep 22, 1998 | 3 km WNW of Xalitzintla, Mexico | M4.0 | 148 km | 1 km |
| Sep 23, 1998 | 1 km NW of Xalitzintla, Mexico | M3.9 | 147 km | 3 km |
| Mar 19, 2000 | 3 km E of San Antonio Virreyes, Mexico | M3.9 | 99 km | 9 km |
| May 20, 2010 | 3 km N of La Estancia, Mexico | M3.9 | 108 km | 5 km |
| May 23, 1998 | 3 km SSW of Tequexquináhuac, Mexico | M3.8 | 135 km | 8 km |
| Feb 22, 2003 | 1 km S of San Lucas Atzala, Mexico | M3.8 | 145 km | 10 km |
| Mar 22, 1999 | 0 km E of Xalitzintla, Mexico | M3.8 | 147 km | 0 km |
| Feb 14, 2003 | 2 km SSE of San Nicolás de los Ranchos, Mexico | M3.8 | 149 km | 1 km |
| Apr 16, 2005 | 2 km WNW of Santa María Chimalhuacán, Mexico | M3.8 | 148 km | 13 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Hurricane History
11 hurricanes (Category 1+) recorded within 500 km since 1980. Strongest on record: Category 3.
| Year | Name | Category | Max Wind | Closest |
| 2021 | Grace | Category 3 | 121 mph | 32 km |
| 2017 | Katia | Category 2 | 104 mph | 89 km |
| 2017 | Franklin | Category 1 | 86 mph | 136 km |
| 2010 | Karl | Category 3 | 127 mph | 189 km |
| 2007 | Dean | Category 2 | 98 mph | 65 km |
| 2007 | Lorenzo | Category 1 | 81 mph | 85 km |
| 2000 | Keith | Category 1 | 92 mph | 191 km |
| 1996 | Dolly | Category 1 | 81 mph | 150 km |
| 1993 | Gert | Category 2 | 98 mph | 103 km |
| 1990 | Diana | Category 2 | 98 mph | 86 km |
| 1988 | Debby | Category 1 | 75 mph | 77 km |
Source: NOAA IBTrACS (Category 1+, 1980–2026).
Nearby Volcanoes
11 volcanoes within 200 km. Closest: Humeros, Los (78 km).
| Name | Type | Elevation | Last Eruption | Distance |
| Humeros, Los | Caldera(s) | 3,150 m (10,335 ft) | -4470 | 78 km |
| Cofre de Perote | Shield(s) | 4,282 m (14,049 ft) | 1150 | 114 km |
| Serdan-Oriental | Tuff cone(s) | 3,485 m (11,434 ft) | Unknown | 118 km |
| Gloria, La | Volcanic field | 3,500 m (11,483 ft) | Unknown | 122 km |
| Naolinco Volcanic Field | Pyroclastic cone(s) | 2,000 m (6,562 ft) | -1200 | 134 km |
| Papayo | Lava dome | 3,600 m (11,811 ft) | Unknown | 137 km |
| Cumbres, Las | Stratovolcano | 3,940 m (12,927 ft) | -3920 | 139 km |
| Iztaccihuatl | Stratovolcano | 5,230 m (17,159 ft) | Unknown | 145 km |
| Orizaba, Pico de | Stratovolcano | 5,564 m (18,255 ft) | 1846 | 151 km |
| Popocatepetl | Stratovolcano(es) | 5,393 m (17,694 ft) | 2020 | 159 km |
| Chichinautzin | Volcanic field | 3,930 m (12,894 ft) | 400 | 186 km |
Source: Smithsonian Institution Global Volcanism Program (GVP).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 65°F (19°C) | 2.3 in | |
| February | 62°F (17°C) | 2.3 in | |
| March | 66°F (19°C) | 2.2 in | Driest |
| April | 70°F (21°C) | 3.0 in | |
| May | 73°F (23°C) | 5.0 in | |
| June | 72°F (22°C) | 14.5 in | |
| July | 77°F (25°C) | 16.3 in | Warmest |
| August | 71°F (22°C) | 16.5 in | |
| September | 70°F (21°C) | 19.3 in | Wettest |
| October | 68°F (20°C) | 10.3 in | |
| November | 65°F (18°C) | 4.3 in | |
| December | 62°F (17°C) | 2.6 in | Coldest |
La Unión has a seasonal temperature swing of 15°F / from 62°F in December to 77°F in July. Total annual precipitation is 98.7 inches, with September being the wettest month (19.3") and March the driest (2.2").