Santiago Llano Grande, Mexico

Full City Profile

1,880 Population 76/sq mi density

253 ft Elevation 77 meters

81°F Avg Temperature 27°C

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. The area gets 358 sunny days per year. Annual precipitation totals 66.6 inches. The area receives 0.0 inches of snow annually.

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

Annual Rainfall 66.6"

75% above US avg

Snowfall 0.0"

Wettest Month (Sep) 13.27"

Driest Month (Mar) 0.08"

Air Quality

Earthquake History

2,675 earthquakes (M2.5+) within 150 km since 1990. Strongest: M7.4. Most recent: M4.4 on Aug 21, 2025.

Mar 20, 2012	6 km E of Santiago Llano Grande, Mexico	M7.4	6 km
Sep 14, 1995	5 km N of Azoyú, Mexico	M7.4	46 km
Feb 16, 2018	4 km S of Pinotepa de Don Luis, Mexico	M7.2	35 km
Feb 25, 1996	24 km SSW of Santa María Chico Ometepec, Mexico	M7.1	61 km
Jul 19, 1997	4 km ENE of El Ciruelo, Mexico	M6.9	19 km
Oct 24, 1993	1 km ENE of Jolotichán, Mexico	M6.7	54 km
Jun 30, 2010	2 km ESE of San Agustín Chayuco, Mexico	M6.3	55 km
Feb 25, 1996	7 km SE of Santa María Chico Ometepec, Mexico	M6.2	56 km
Aug 21, 2013	5 km ESE of Barrio Nuevo de los Muertos, Mexico	M6.2	136 km
May 15, 1993	1 km ENE of Ometepec, Mexico	M6.1	26 km
Dec 16, 1997	46 km SSW of Barra de Tecoanapa, Mexico	M6.0	74 km
May 15, 1993	2 km SSW of Ometepec, Mexico	M6.0	25 km
Apr 2, 2012	7 km SSW of Santa María Cortijo, Mexico	M6.0	11 km
Nov 13, 1993	18 km SW of Montecillos, Mexico	M6.0	43 km
Jun 14, 2004	0 km W of Santa Catarina Mechoacán, Mexico	M5.9	50 km
Mar 19, 1996	21 km WSW of Bajos de Chila, Mexico	M5.9	127 km
Feb 19, 2018	4 km SSE of Santiago Tetepec, Mexico	M5.9	64 km
Feb 17, 2018	8 km SE of José María Morelos, Mexico	M5.8	58 km
Mar 10, 2014	26 km SW of Corralero, Mexico	M5.8	50 km
Apr 1, 1991	11 km SW of Corralero, Mexico	M5.8	35 km

Source: USGS (M2.5+, 1990–2025)

Hurricane History

17 hurricanes (Cat 1+) within 500 km since 1980. Strongest: Category 5. Most recent: Erick (2025).

Year	Name	Category	Closest
2025	Erick	Category 4	15 km
2024	John	Category 3	66 km
2023	Otis	Category 5	157 km
2022	Agatha	Category 2	185 km
2017	Max	Category 1	69 km
2015	Carlos	Category 1	217 km
2012	Carlotta	Category 2	42 km
2011	Hilary	Category 3	162 km
2006	John	Category 3	254 km
1998	Lester	Category 2	237 km
1997	Pauline	Category 4	10 km
1997	Rick	Category 2	88 km
1996	Douglas	Category 1	291 km
1996	Boris	Category 1	214 km
1993	Calvin	Category 2	256 km
1989	Cosme	Category 1	87 km
1984	Odile	Category 2	257 km

Source: NOAA IBTrACS (Cat 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. Sorted by wave height.

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").

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