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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 76°F (25°C). Winters average 59°F in January while summers reach 91°F in July. The area gets 351 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 6.6 inches (drier than the 38-inch national average). The city sits at an elevation of 33 feet.
Temperature
59°F Jan (15°C)
91°F Jul (33°C)
| Annual Average | 76.4°F |
| 41% above US avg | |
| January Average | 59°F (15°C) |
| July Average | 91°F (33°C) |
| Sunny Days | 351 days/yr |
Geography
| Elevation | 33 ft (10 m) |
| Area | 1,525.5 sq mi (3,950.9 km²) |
| Population Density | 3/sq mi |
| Coordinates | 26.8202°N, 109.6083°W |
| Timezone | America/Hermosillo |
Precipitation & Snow
Air Quality
Earthquake History
162 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M6.6.
| Aug 28, 1995 | 95 km SW of Etchoropo, Mexico | M6.6 | 105 km | 12 km |
| Oct 19, 2013 | 98 km SW of Etchoropo, Mexico | M6.6 | 108 km | 9 km |
| Mar 12, 2003 | 87 km SW of Paredón Colorado, Mexico | M6.4 | 102 km | 10 km |
| Jan 19, 2018 | 79 km NNE of Loreto, Mexico | M6.3 | 147 km | 10 km |
| Mar 13, 2007 | 85 km ENE of Loreto, Mexico | M6.0 | 111 km | 26 km |
| Feb 25, 2007 | 94 km E of Loreto, Mexico | M5.9 | 110 km | 10 km |
| Mar 29, 2017 | 71 km WSW of Las Grullas Margen Derecha, Mexico | M5.7 | 130 km | 17 km |
| Jan 13, 2013 | 76 km W of Las Grullas Margen Derecha, Mexico | M5.7 | 115 km | 10 km |
| Feb 22, 2005 | 66 km W of Campo Pesquero el Colorado, Mexico | M5.6 | 133 km | 10 km |
| Oct 1, 1996 | 70 km NE of Loreto, Mexico | M5.5 | 130 km | 10 km |
| Jan 13, 2013 | 79 km W of Las Grullas Margen Derecha, Mexico | M5.4 | 127 km | 10 km |
| Mar 28, 2007 | 43 km SW of Campo Pesquero el Colorado, Mexico | M5.3 | 147 km | 10 km |
| Jan 21, 2022 | 76 km SSW of Bahía de Lobos, Mexico | M5.3 | 125 km | 10 km |
| Oct 13, 2016 | 52 km SW of Campo Pesquero el Colorado, Mexico | M5.3 | 150 km | 24 km |
| Jan 18, 2001 | 99 km SW of Etchoropo, Mexico | M5.3 | 109 km | 10 km |
| Jul 3, 2024 | 77 km NNE of Loreto, Mexico | M5.3 | 147 km | 10 km |
| Sep 3, 1996 | 84 km ENE of Loreto, Mexico | M5.2 | 115 km | 10 km |
| Apr 18, 2024 | 84 km ENE of Loreto, Mexico | M5.2 | 112 km | 10 km |
| Feb 23, 2007 | 83 km E of Loreto, Mexico | M5.2 | 132 km | 10 km |
| Feb 25, 2007 | 73 km E of Loreto, Mexico | M5.2 | 133 km | 10 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Hurricane History
15 hurricanes (Category 1+) recorded within 500 km since 1980. Strongest on record: Category 2.
| Year | Name | Category | Max Wind | Closest |
| 2016 | Newton | Category 1 | 81 mph | 233 km |
| 2014 | Odile | Category 2 | 104 mph | 251 km |
| 2013 | Manuel | Category 1 | 75 mph | 276 km |
| 2009 | Jimena | Category 2 | 104 mph | 278 km |
| 2008 | Norbert | Category 2 | 104 mph | 39 km |
| 2007 | Henriette | Category 1 | 75 mph | 111 km |
| 2006 | John | Category 1 | 81 mph | 284 km |
| 2003 | Ignacio | Category 1 | 81 mph | 281 km |
| 2003 | Marty | Category 1 | 81 mph | 182 km |
| 1998 | Isis | Category 1 | 75 mph | 201 km |
| 1996 | Fausto | Category 1 | 81 mph | 125 km |
| 1995 | Ismael | Category 1 | 81 mph | 145 km |
| 1986 | Newton | Category 1 | 86 mph | 23 km |
| 1986 | Paine | Category 1 | 92 mph | 216 km |
| 1982 | Paul | Category 2 | 109 mph | 139 km |
Source: NOAA IBTrACS (Category 1+, 1980–2026).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 59°F (15°C) | 0.7 in | Coldest |
| February | 63°F (17°C) | 0.4 in | |
| March | 66°F (19°C) | 0.2 in | |
| April | 71°F (22°C) | 0.0 in | Driest |
| May | 76°F (25°C) | 0.0 in | |
| June | 83°F (29°C) | 0.1 in | |
| July | 91°F (33°C) | 2.3 in | Warmest |
| August | 86°F (30°C) | 4.1 in | Wettest |
| September | 85°F (29°C) | 2.6 in | |
| October | 79°F (26°C) | 1.2 in | |
| November | 70°F (21°C) | 0.7 in | |
| December | 62°F (17°C) | 0.9 in |
La Unión has a seasonal temperature swing of 32°F / from 59°F in January to 91°F in July. Total annual precipitation is 13.3 inches, with August being the wettest month (4.1") and April the driest (0.0").