San Antonio, Puerto Rico

Full City Profile

6,456 Population 3,434/sq mi density

23 ft Elevation 7 meters

80°F Avg Temperature 26°C

San Antonio has a warm climate with an average annual temperature of 80°F (27°C). Winters average 75°F in January while summers reach 83°F in July. The area gets 354 sunny days per year. Annual precipitation totals 45.4 inches. The area receives 0.0 inches of snow annually.

Temperature

75°F Jan (24°C) 83°F Jul (29°C)

Annual Average	79.6°F
	47% above US avg
January Average	75°F (24°C)
July Average	83°F (29°C)
Sunny Days	354 days/yr

Geography

Elevation	23 ft (7 m)
Area	1.9 sq mi (4.9 km²)
Population Density	3,434/sq mi
Coordinates	18.4488°N, 66.3027°W
Timezone	America/Puerto_Rico

Precipitation & Snow

Annual Rainfall 45.4"

19% above US avg

Snowfall 0.0"

Wettest Month (Aug) 8.03"

Driest Month (Feb) 3.07"

Air Quality

Earthquake History

22,836 earthquakes (M2.5+) within 150 km since 1990. Strongest: M6.4. Most recent: M0.0 on Aug 30, 2025.

Jan 13, 2014	61 km N of Hatillo, Puerto Rico	M6.4	85 km
Jan 7, 2020	4 km SSE of Indios, Puerto Rico	M6.4	77 km
Sep 24, 2019	67 km NNW of San Antonio, Puerto Rico	M6.0	124 km
Jan 11, 2020	5 km SE of Maria Antonia, Puerto Rico	M5.9	80 km
Jan 6, 2020	14 km S of Indios, Puerto Rico	M5.8	85 km
May 16, 2010	4 km E of Moca, Puerto Rico	M5.8	81 km
Jan 7, 2020	11 km S of Tallaboa, Puerto Rico	M5.6	76 km
May 15, 2024	92 km NNW of San Antonio, Puerto Rico	M5.6	149 km
Jan 7, 2020	0 km NW of Magas Arriba, Puerto Rico	M5.6	69 km
Feb 4, 2008	Puerto Rico region	M5.5	90 km
Dec 11, 2000	65 km N of Isabela, Puerto Rico	M5.5	110 km
May 2, 2020	6 km S of Tallaboa, Puerto Rico	M5.4	72 km
Jul 3, 2020	9 km SSE of La Parguera, Puerto Rico	M5.3	96 km
Nov 23, 1992	28 km NNW of San Antonio, Puerto Rico	M5.3	97 km
Aug 1, 1993	68 km SSE of Emajagua, Puerto Rico	M5.3	132 km
Jan 11, 2020	19 km S of Indios, Puerto Rico	M5.2	87 km
Jan 10, 2020	4 km S of Maria Antonia, Puerto Rico	M5.2	84 km
Jan 15, 2020	Puerto Rico region	M5.2	96 km
Mar 12, 2009	66 km N of Brenas, Puerto Rico	M5.1	69 km
Aug 14, 2009	92 km N of Suárez, Puerto Rico	M5.1	109 km

Source: USGS (M2.5+, 1990–2025)

Hurricane History

24 hurricanes (Cat 1+) within 500 km since 1980. Strongest: Category 5.

Year	Name	Category	Closest
2025	Erin	Category 4	213 km
2024	Ernesto	Category 1	187 km
2022	Fiona	Category 1	96 km
2019	Dorian	Category 1	98 km
2017	Maria	Category 5	30 km
2017	Irma	Category 5	84 km
2014	Gonzalo	Category 3	226 km
2011	Irene	Category 1	20 km
2010	Earl	Category 4	166 km
2008	Omar	Category 4	215 km
2004	Frances	Category 4	226 km
2004	Jeanne	Category 1	180 km
2000	Debby	Category 1	65 km
1999	Lenny	Category 4	197 km
1999	Jose	Category 1	267 km
1998	Georges	Category 3	28 km
1996	Bertha	Category 3	104 km
1996	Hortense	Category 1	80 km
1995	Luis	Category 4	227 km
1995	Marilyn	Category 3	81 km

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

Tsunami History

5 tsunamis recorded within 500 km. Highest wave on record: 15.2 m (50 ft).

Year	Location	Cause	Max Wave	Deaths	Distance
1867	VIRGIN ISLANDS	Earthquake	15.2 m	24	140 km
1918	PUERTO RICO: MONA PASSAGE	Eruption + Earthquake	6.1 m	144	98 km
1868	VIRGIN ISLANDS	Earthquake	1.5 m	—	133 km
2020	PUERTO RICO	Earthquake	0.1 m	4	77 km
1918	PUERTO RICO	Earthquake	—	—	96 km

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

Wildfire History

6 wildfires (100+ acres) within 100 km. Largest: CAMPAMENTO SANTIAGO (3,927 ac, 2005).

Year	Name	Acres	Distance
2005	CAMPAMENTO SANTIAGO	3,927	47 km
2007	UNNAMED	3,896	47 km
2005	UNNAMED	1,888	50 km
2005	PISTA DE SALINAS CARR 3	1,137	49 km
2005	UNNAMED	725	58 km
2007	CARR 304	606	93 km

Source: NIFC/IRWIN (100+ acres)

Monthly Weather

Month	Avg Temperature	Precipitation	Summary
January	75°F (24°C)	5.0 in	Coldest
February	75°F (24°C)	3.1 in	Driest
March	75°F (24°C)	3.5 in
April	77°F (25°C)	4.7 in
May	79°F (26°C)	8.0 in
June	80°F (27°C)	5.4 in
July	83°F (29°C)	6.9 in	Warmest
August	81°F (27°C)	8.0 in	Wettest
September	80°F (27°C)	6.4 in
October	80°F (27°C)	6.5 in
November	78°F (26°C)	7.6 in
December	76°F (24°C)	6.6 in

San Antonio has a seasonal temperature swing of 9°F / from 75°F in January to 83°F in July. Total annual precipitation is 71.7 inches, with August being the wettest month (8.0") and February the driest (3.1").

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