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Weather & Climate in Santiago Llano Grande, Mexico
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Santiago Llano Grande has a warm climate with an average annual temperature of 81°F (27°C). Winters average 79°F in January while summers reach 82°F in July / relatively mild seasonal variation. The area gets 358 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 66.6 inches (wetter than the 38-inch national average). The city sits at an elevation of 253 feet.
Temperature
79°F Jan (26°C)
82°F Jul (28°C)
| Annual Average | 81.1°F |
| 50% above US avg | |
| January Average | 79°F (26°C) |
| July Average | 82°F (28°C) |
| Sunny Days | 358 days/yr |
Geography
| Elevation | 253 ft (77 m) |
| Area | 24.6 sq mi (63.8 km²) |
| Population Density | 76/sq mi |
| Coordinates | 16.4883°N, 98.2897°W |
| Timezone | America/Mexico_City |
Precipitation & Snow
Air Quality
Earthquake History
2,675 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M7.4.
| Mar 20, 2012 | 6 km E of Santiago Llano Grande, Mexico | M7.4 | 6 km | 20 km |
| Sep 14, 1995 | 5 km N of Azoyú, Mexico | M7.4 | 46 km | 23 km |
| Feb 16, 2018 | 4 km S of Pinotepa de Don Luis, Mexico | M7.2 | 35 km | 22 km |
| Feb 25, 1996 | 24 km SSW of Santa María Chico Ometepec, Mexico | M7.1 | 61 km | 21 km |
| Jul 19, 1997 | 4 km ENE of El Ciruelo, Mexico | M6.9 | 19 km | 33 km |
| Oct 24, 1993 | 1 km ENE of Jolotichán, Mexico | M6.7 | 54 km | 21 km |
| Jun 30, 2010 | 2 km ESE of San Agustín Chayuco, Mexico | M6.3 | 55 km | 20 km |
| Feb 25, 1996 | 7 km SE of Santa María Chico Ometepec, Mexico | M6.2 | 56 km | 12 km |
| Aug 21, 2013 | 5 km ESE of Barrio Nuevo de los Muertos, Mexico | M6.2 | 136 km | 21 km |
| May 15, 1993 | 1 km ENE of Ometepec, Mexico | M6.1 | 26 km | 21 km |
| Dec 16, 1997 | 46 km SSW of Barra de Tecoanapa, Mexico | M6.0 | 74 km | 10 km |
| May 15, 1993 | 2 km SSW of Ometepec, Mexico | M6.0 | 25 km | 20 km |
| Apr 2, 2012 | 7 km SSW of Santa María Cortijo, Mexico | M6.0 | 11 km | 9 km |
| Nov 13, 1993 | 18 km SW of Montecillos, Mexico | M6.0 | 43 km | 20 km |
| Jun 14, 2004 | 0 km W of Santa Catarina Mechoacán, Mexico | M5.9 | 50 km | 10 km |
| Mar 19, 1996 | 21 km WSW of Bajos de Chila, Mexico | M5.9 | 127 km | 33 km |
| Feb 19, 2018 | 4 km SSE of Santiago Tetepec, Mexico | M5.9 | 64 km | 22 km |
| Feb 17, 2018 | 8 km SE of José María Morelos, Mexico | M5.8 | 58 km | 3 km |
| Mar 10, 2014 | 26 km SW of Corralero, Mexico | M5.8 | 50 km | 8 km |
| Apr 1, 1991 | 11 km SW of Corralero, Mexico | M5.8 | 35 km | 21 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Hurricane History
17 hurricanes (Category 1+) recorded within 500 km since 1980. Strongest on record: Category 5.
| Year | Name | Category | Max Wind | Closest |
| 2025 | Erick | Category 4 | 138 mph | 15 km |
| 2024 | John | Category 3 | 121 mph | 66 km |
| 2023 | Otis | Category 5 | 167 mph | 157 km |
| 2022 | Agatha | Category 2 | 109 mph | 185 km |
| 2017 | Max | Category 1 | 92 mph | 69 km |
| 2015 | Carlos | Category 1 | 86 mph | 217 km |
| 2012 | Carlotta | Category 2 | 109 mph | 42 km |
| 2011 | Hilary | Category 3 | 121 mph | 162 km |
| 2006 | John | Category 3 | 121 mph | 254 km |
| 1998 | Lester | Category 2 | 104 mph | 237 km |
| 1997 | Pauline | Category 4 | 132 mph | 10 km |
| 1997 | Rick | Category 2 | 98 mph | 88 km |
| 1996 | Douglas | Category 1 | 92 mph | 291 km |
| 1996 | Boris | Category 1 | 92 mph | 214 km |
| 1993 | Calvin | Category 2 | 98 mph | 256 km |
| 1989 | Cosme | Category 1 | 86 mph | 87 km |
| 1984 | Odile | Category 2 | 104 mph | 257 km |
Source: NOAA IBTrACS (Category 1+, 1980–2026).
Tsunami History
10 tsunamis recorded within 500 km. Highest wave on record: 4.0 m (13 ft).
| Year | Location | Cause | Max Wave | Deaths | Distance |
| 1787 | SAN MARCOS | Earthquake | 4.0 m | 11 | 23 km |
| 1754 | S. MEXICO | Earthquake | 4.0 m | — | 103 km |
| 1957 | S. MEXICO | Earthquake | 1.3 m | 65 | 86 km |
| 1995 | S. MEXICO | Earthquake | 0.4 m | 3 | 46 km |
| 1950 | S. MEXICO | Earthquake | 0.3 m | — | 8 km |
| 2012 | S. MEXICO | Earthquake | 0.2 m | 2 | 6 km |
| 1928 | S. MEXICO | Earthquake | 0.2 m | 4 | 143 km |
| 1996 | MEXICO | Earthquake | 0.1 m | — | 61 km |
| 2026 | ACAPULCO | Earthquake | 0.1 m | 2 | 117 km |
| 1968 | ACAPULCO | Earthquake | — | 18 | 59 km |
Source: NOAA/NCEI Historical Tsunami Database.
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 79°F (26°C) | 0.3 in | |
| February | 78°F (26°C) | 0.1 in | Coldest |
| March | 80°F (27°C) | 0.1 in | Driest |
| April | 82°F (28°C) | 0.1 in | |
| May | 84°F (29°C) | 2.5 in | Warmest |
| June | 83°F (28°C) | 10.4 in | |
| July | 82°F (28°C) | 9.6 in | |
| August | 82°F (28°C) | 12.0 in | |
| September | 81°F (27°C) | 13.3 in | Wettest |
| October | 81°F (27°C) | 6.4 in | |
| November | 80°F (26°C) | 1.1 in | |
| December | 78°F (26°C) | 0.3 in |
Santiago Llano Grande has a seasonal temperature swing of 6°F / from 78°F in February to 84°F in May. Total annual precipitation is 56.1 inches, with September being the wettest month (13.3") and March the driest (0.1").