San Dionisio del Mar, Mexico

Full City Profile

3,140 Population 63/sq mi density

62 ft Elevation 19 meters

81°F Avg Temperature 27°C

San Dionisio del Mar has a warm climate with an average annual temperature of 81°F (27°C). Winters average 76°F in January while summers reach 83°F in July. The area gets 269 sunny days per year. Annual precipitation totals 37.2 inches. The area receives 0.0 inches of snow annually.

Temperature

76°F Jan (25°C) 83°F Jul (28°C)

Annual Average	80.6°F
	49% above US avg
January Average	76°F (25°C)
July Average	83°F (28°C)
Sunny Days	269 days/yr

Geography

Elevation	62 ft (19 m)
Area	50.0 sq mi (129.6 km²)
Population Density	63/sq mi
Coordinates	16.3237°N, 94.7583°W
Timezone	America/Mexico_City

Precipitation & Snow

Annual Rainfall 37.2"

2% below US avg

Snowfall 0.0"

Wettest Month (Sep) 9.69"

Driest Month (Jan) 0.04"

Air Quality

Earthquake History

2,942 earthquakes (M2.5+) within 150 km since 1990. Strongest: M7.4. Most recent: M4.3 on Aug 26, 2025.

Jun 23, 2020	9 km SE of Santa María Xadani, Mexico	M7.4	142 km
Oct 21, 1995	13 km NW of Ocozocoautla de Espinosa, Mexico	M7.2	149 km
Apr 7, 2011	7 km SW of Helio García Alfaro, Mexico	M6.6	108 km
Feb 12, 2008	9 km SSW of General Pascual Fentes, Mexico	M6.5	49 km
Sep 30, 1993	90 km S of San Francisco del Mar Viejo, Mexico	M6.5	101 km
Jun 7, 1998	2 km NNE of Cabeza de Toro, Mexico	M6.3	113 km
Jul 6, 2007	6 km N of Lázaro Cárdenas, Mexico	M6.1	82 km
Sep 23, 2017	7 km NNE of Ixtepec, Mexico	M6.1	48 km
Aug 18, 2004	8 km E of Juchitán de Zaragoza, Mexico	M5.9	23 km
Jan 5, 2020	3 km W of Reforma de Pineda, Mexico	M5.9	30 km
Aug 7, 2004	17 km WNW of Palomares, Mexico	M5.9	109 km
Sep 10, 2017	92 km S of San Francisco del Mar Viejo, Mexico	M5.8	106 km
Sep 23, 2017	80 km SSW of La Gloria, Mexico	M5.8	99 km
May 21, 2014	2 km SSW of Palomares, Mexico	M5.8	95 km
Aug 9, 2023	7 km NNE of Tonalá, Mexico	M5.8	112 km
Sep 24, 2017	80 km SSW of Cabeza de Toro, Mexico	M5.8	129 km
Mar 2, 2023	Oaxaca, Mexico	M5.7	38 km
Sep 8, 2017	100 km SSW of Cabeza de Toro, Mexico	M5.7	137 km
Aug 5, 2015	11 km ENE of Tonalá, Mexico	M5.7	119 km
May 20, 2017	21 km SE of La Horqueta (Poblado Doce), Mexico	M5.7	108 km

Source: USGS (M2.5+, 1990–2025)

Hurricane History

8 hurricanes (Cat 1+) within 500 km since 1980. Strongest: Category 4. Most recent: Erick (2025).

Year	Name	Category	Closest
2025	Erick	Category 4	270 km
2022	Agatha	Category 2	182 km
2013	Barbara	Category 1	89 km
2012	Carlotta	Category 2	223 km
2005	Stan	Category 1	254 km
1998	Lester	Category 2	211 km
1997	Pauline	Category 4	200 km
1997	Rick	Category 1	141 km

Source: NOAA IBTrACS (Cat 1+, 1980–2026)

Tsunami History

4 tsunamis recorded within 500 km. Highest wave on record: 1.6 m (5 ft).

Year	Location	Cause	Max Wave	Deaths	Distance
2020	OFF COAST OF OAXACA	Earthquake	1.6 m	10	142 km
1965	MEXICO	Earthquake	0.4 m	6	111 km
2022	S. MEXICO	Earthquake	0.2 m	—	129 km
2025	OFF COAST OF OAXACA	Earthquake	0.2 m	—	67 km

Source: NOAA/NCEI Historical Tsunami Database. Sorted by wave height.

Nearby Volcanoes

1 volcano within 200 km. Closest: Chichon, El (200 km).

Name	Type	Elevation	Last Eruption	Distance
Chichon, El	Lava dome(s)	1,150 m (3,773 ft)	1982	200 km

Source: Smithsonian Institution Global Volcanism Program (GVP). Sorted by distance.

Monthly Weather

Month	Avg Temperature	Precipitation	Summary
January	76°F (25°C)	0.0 in	Coldest, Driest
February	77°F (25°C)	0.2 in
March	80°F (27°C)	0.1 in
April	83°F (28°C)	0.3 in
May	84°F (29°C)	2.8 in	Warmest
June	83°F (28°C)	7.9 in
July	83°F (28°C)	5.4 in
August	82°F (28°C)	8.0 in
September	81°F (27°C)	9.7 in	Wettest
October	81°F (27°C)	2.3 in
November	79°F (26°C)	0.5 in
December	77°F (25°C)	0.0 in

San Dionisio del Mar has a seasonal temperature swing of 8°F / from 76°F in January to 84°F in May. Total annual precipitation is 37.2 inches, with September being the wettest month (9.7") and January the driest (0.0").

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