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Weather & Climate in San Francisco la Unión, Guatemala
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
San Francisco la Unión experiences four distinct seasons with an average annual temperature of 54°F (12°C). Winters average 51°F in January while summers reach 56°F in July / relatively mild seasonal variation. The area gets 236 sunny days per year, above the national average. Annual precipitation totals 55.3 inches (wetter than the 38-inch national average). The city sits at an elevation of 9,045 feet.
Temperature
51°F Jan (11°C)
56°F Jul (13°C)
| Annual Average | 54.2°F |
| 0% below US avg | |
| January Average | 51°F (11°C) |
| July Average | 56°F (13°C) |
| Sunny Days | 236 days/yr |
Geography
| Elevation | 9,045 ft (2,757 m) |
| Area | 6.6 sq mi (17.2 km²) |
| Population Density | 176/sq mi |
| Coordinates | 14.9235°N, 91.5416°W |
| Timezone | America/Guatemala |
Precipitation & Snow
Air Quality
Earthquake History
1,981 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M7.4.
| Nov 7, 2012 | 33 km S of Champerico, Guatemala | M7.4 | 111 km | 24 km |
| Sep 10, 1993 | 24 km W of Puerto Madero, Mexico | M7.2 | 121 km | 34 km |
| Jun 14, 2017 | 2 km SSW of San Pablo, Guatemala | M6.9 | 50 km | 93 km |
| Jul 7, 2014 | 4 km W of Puerto Madero, Mexico | M6.9 | 101 km | 53 km |
| Sep 3, 1993 | 38 km SW of Puerto Madero, Mexico | M6.8 | 134 km | 27 km |
| Jun 22, 2017 | 28 km SW of Puerto San José, Guatemala | M6.8 | 148 km | 38 km |
| Feb 1, 2019 | 5 km SW of Puerto Madero, Mexico | M6.7 | 102 km | 66 km |
| Jan 10, 1998 | 10 km SSW of San José El Ídolo, Guatemala | M6.6 | 62 km | 33 km |
| Nov 11, 2012 | 32 km SW of Champerico, Guatemala | M6.5 | 111 km | 20 km |
| May 12, 2024 | 28 km WSW of Brisas Barra de Suchiate, Mexico | M6.4 | 113 km | 62 km |
| Sep 7, 2013 | 7 km ESE of Ignacio López Rayón, Mexico | M6.4 | 72 km | 66 km |
| May 17, 2023 | 8 km SE of Canillá, Guatemala | M6.4 | 82 km | 252 km |
| Jun 6, 1999 | 6 km ESE of Puerto San José, Guatemala | M6.3 | 141 km | 33 km |
| May 3, 2009 | 5 km S of San Lucas Tolimán, Guatemala | M6.3 | 60 km | 108 km |
| Mar 12, 2000 | 3 km ESE of Plan de Ayala, Mexico | M6.3 | 97 km | 62 km |
| Feb 16, 2022 | 12 km WSW of Nueva Concepción, Guatemala | M6.2 | 88 km | 60 km |
| Mar 25, 2013 | 3 km NW of Fraijanes, Guatemala | M6.2 | 126 km | 189 km |
| Sep 18, 1991 | 4 km SE of Patzún, Guatemala | M6.2 | 67 km | 5 km |
| Mar 17, 2005 | 10 km NE of San Bartolo, Guatemala | M6.1 | 30 km | 197 km |
| Mar 3, 1998 | 9 km SSW of San José El Ídolo, Guatemala | M6.1 | 61 km | 63 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Hurricane History
3 hurricanes (Category 1+) recorded within 500 km since 1980. Strongest on record: Category 1.
| Year | Name | Category | Max Wind | Closest |
| 2013 | Barbara | Category 1 | 81 mph | 289 km |
| 2005 | Adrian | Category 1 | 81 mph | 284 km |
| 1996 | Douglas | Category 1 | 75 mph | 270 km |
Source: NOAA IBTrACS (Category 1+, 1980–2026).
Tsunami History
3 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 | — | 45 km |
| 2012 | GUATEMALA | Earthquake | 0.4 m | 48 | 111 km |
| 1950 | GUATEMALA | Earthquake | 0.2 m | — | 79 km |
Source: NOAA/NCEI Historical Tsunami Database.
Nearby Volcanoes
15 volcanoes within 200 km. Closest: Almolonga (14 km).
| Name | Type | Elevation | Last Eruption | Distance |
| Almolonga | Stratovolcano | 3,173 m (10,410 ft) | 1818 | 14 km |
| Santa Maria | Stratovolcano | 3,745 m (12,287 ft) | 2020 | 19 km |
| Toliman | Stratovolcano(es) | 3,158 m (10,361 ft) | Unknown | 51 km |
| Tacana | Stratovolcano | 4,064 m (13,333 ft) | 1986 | 65 km |
| Acatenango | Stratovolcano(es) | 3,976 m (13,045 ft) | 1972 | 86 km |
| Fuego | Stratovolcano(es) | 3,763 m (12,346 ft) | 2020 | 87 km |
| Agua | Stratovolcano | 3,760 m (12,336 ft) | Unknown | 100 km |
| Pacaya | Complex | 2,569 m (8,428 ft) | 2020 | 118 km |
| Cuilapa-Barbarena | Volcanic field | 1,454 m (4,770 ft) | Unknown | 139 km |
| Tecuamburro | Stratovolcano | 1,845 m (6,053 ft) | -960 | 149 km |
| Flores | Volcanic field | 1,600 m (5,249 ft) | Unknown | 180 km |
| Moyuta | Stratovolcano | 1,662 m (5,453 ft) | Unknown | 184 km |
| Tahual | Stratovolcano | 1,716 m (5,630 ft) | Unknown | 185 km |
| Santiago, Cerro | Volcanic field | 1,192 m (3,911 ft) | Unknown | 192 km |
| Suchitan | Stratovolcano(es) | 2,042 m (6,699 ft) | Unknown | 198 km |
Source: Smithsonian Institution Global Volcanism Program (GVP).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 51°F (11°C) | 0.2 in | Coldest, Driest |
| February | 52°F (11°C) | 0.4 in | |
| March | 55°F (13°C) | 0.8 in | |
| April | 56°F (14°C) | 2.1 in | Warmest |
| May | 56°F (14°C) | 7.2 in | |
| June | 56°F (13°C) | 10.8 in | Wettest |
| July | 56°F (13°C) | 7.1 in | |
| August | 55°F (13°C) | 8.0 in | |
| September | 55°F (13°C) | 10.4 in | |
| October | 54°F (12°C) | 6.4 in | |
| November | 53°F (12°C) | 1.6 in | |
| December | 51°F (11°C) | 0.5 in |
San Francisco la Unión has a seasonal temperature swing of 5°F / from 51°F in January to 56°F in April. Total annual precipitation is 55.3 inches, with June being the wettest month (10.8") and January the driest (0.2").