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Weather & Climate in Santo Tomás La Unión, Guatemala
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Santo Tomás La Unión has a warm climate with an average annual temperature of 75°F (24°C). Winters average 74°F in January while summers reach 76°F in July / relatively mild seasonal variation. The area gets 162 sunny days per year, below the national average of 205. Annual precipitation totals 137.4 inches (wetter than the 38-inch national average). The city sits at an elevation of 2,854 feet.
Temperature
74°F Jan (23°C)
76°F Jul (24°C)
| Annual Average | 75.0°F |
| 39% above US avg | |
| January Average | 74°F (23°C) |
| July Average | 76°F (24°C) |
| Sunny Days | 162 days/yr |
Geography
| Elevation | 2,854 ft (870 m) |
| Area | 7.2 sq mi (18.6 km²) |
| Population Density | 986/sq mi |
| Coordinates | 14.6322°N, 91.4108°W |
| Timezone | America/Guatemala |
Precipitation & Snow
Air Quality
Earthquake History
2,321 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 | 89 km | 24 km |
| Sep 10, 1993 | 24 km W of Puerto Madero, Mexico | M7.2 | 133 km | 34 km |
| Jul 7, 2014 | 4 km W of Puerto Madero, Mexico | M6.9 | 114 km | 53 km |
| Jun 14, 2017 | 2 km SSW of San Pablo, Guatemala | M6.9 | 71 km | 93 km |
| Sep 3, 1993 | 38 km SW of Puerto Madero, Mexico | M6.8 | 141 km | 27 km |
| Jun 22, 2017 | 28 km SW of Puerto San José, Guatemala | M6.8 | 112 km | 38 km |
| Feb 1, 2019 | 5 km SW of Puerto Madero, Mexico | M6.7 | 112 km | 66 km |
| Jun 13, 2007 | 43 km SSE of Iztapa, Guatemala | M6.7 | 147 km | 23 km |
| Jan 10, 1998 | 10 km SSW of San José El Ídolo, Guatemala | M6.6 | 30 km | 33 km |
| Nov 11, 2012 | 32 km SW of Champerico, Guatemala | M6.5 | 99 km | 20 km |
| Jan 21, 2003 | 33 km S of Puerto San José, Guatemala | M6.5 | 131 km | 24 km |
| Sep 7, 2013 | 7 km ESE of Ignacio López Rayón, Mexico | M6.4 | 76 km | 66 km |
| May 12, 2024 | 28 km WSW of Brisas Barra de Suchiate, Mexico | M6.4 | 115 km | 62 km |
| May 17, 2023 | 8 km SE of Canillá, Guatemala | M6.4 | 84 km | 252 km |
| Jun 6, 1999 | 6 km ESE of Puerto San José, Guatemala | M6.3 | 107 km | 33 km |
| Mar 12, 2000 | 3 km ESE of Plan de Ayala, Mexico | M6.3 | 117 km | 62 km |
| May 10, 1998 | 28 km S of Iztapa, Guatemala | M6.3 | 128 km | 33 km |
| May 3, 2009 | 5 km S of San Lucas Tolimán, Guatemala | M6.3 | 30 km | 108 km |
| Sep 18, 1991 | 4 km SE of Patzún, Guatemala | M6.2 | 46 km | 5 km |
| Feb 16, 2022 | 12 km WSW of Nueva Concepción, Guatemala | M6.2 | 54 km | 60 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Hurricane History
2 hurricanes (Category 1+) recorded within 500 km since 1980. Strongest on record: Category 1.
| Year | Name | Category | Max Wind | Closest |
| 2005 | Adrian | Category 1 | 81 mph | 249 km |
| 1996 | Douglas | Category 1 | 75 mph | 261 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 | — | 19 km |
| 2012 | GUATEMALA | Earthquake | 0.4 m | 48 | 89 km |
| 1950 | GUATEMALA | Earthquake | 0.2 m | — | 65 km |
Source: NOAA/NCEI Historical Tsunami Database.
Nearby Volcanoes
15 volcanoes within 200 km. Closest: Santa Maria (21 km).
| Name | Type | Elevation | Last Eruption | Distance |
| Santa Maria | Stratovolcano | 3,745 m (12,287 ft) | 2020 | 21 km |
| Almolonga | Stratovolcano | 3,173 m (10,410 ft) | 1818 | 22 km |
| Toliman | Stratovolcano(es) | 3,158 m (10,361 ft) | Unknown | 24 km |
| Acatenango | Stratovolcano(es) | 3,976 m (13,045 ft) | 1972 | 59 km |
| Fuego | Stratovolcano(es) | 3,763 m (12,346 ft) | 2020 | 60 km |
| Agua | Stratovolcano | 3,760 m (12,336 ft) | Unknown | 74 km |
| Pacaya | Complex | 2,569 m (8,428 ft) | 2020 | 92 km |
| Tacana | Stratovolcano | 4,064 m (13,333 ft) | 1986 | 93 km |
| Cuilapa-Barbarena | Volcanic field | 1,454 m (4,770 ft) | Unknown | 114 km |
| Tecuamburro | Stratovolcano | 1,845 m (6,053 ft) | -960 | 120 km |
| Moyuta | Stratovolcano | 1,662 m (5,453 ft) | Unknown | 156 km |
| Flores | Volcanic field | 1,600 m (5,249 ft) | Unknown | 157 km |
| Tahual | Stratovolcano | 1,716 m (5,630 ft) | Unknown | 164 km |
| Santiago, Cerro | Volcanic field | 1,192 m (3,911 ft) | Unknown | 169 km |
| Suchitan | Stratovolcano(es) | 2,042 m (6,699 ft) | Unknown | 177 km |
Source: Smithsonian Institution Global Volcanism Program (GVP).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 74°F (23°C) | 0.9 in | Coldest, Driest |
| February | 74°F (24°C) | 1.6 in | |
| March | 76°F (24°C) | 2.2 in | |
| April | 76°F (25°C) | 6.3 in | Warmest |
| May | 76°F (25°C) | 13.1 in | |
| June | 76°F (24°C) | 24.5 in | Wettest |
| July | 76°F (24°C) | 16.5 in | |
| August | 76°F (24°C) | 19.3 in | |
| September | 75°F (24°C) | 24.5 in | |
| October | 75°F (24°C) | 19.7 in | |
| November | 74°F (23°C) | 7.0 in | |
| December | 74°F (23°C) | 2.0 in |
Santo Tomás La Unión has a seasonal temperature swing of 3°F / from 74°F in January to 76°F in April. Total annual precipitation is 137.4 inches, with June being the wettest month (24.5") and January the driest (0.9").