Río Grande, Puerto Rico

Full City Profile

13,467 Population 150/sq mi density

43 ft Elevation 13 meters

81°F Avg Temperature 27°C

Río Grande 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 354 sunny days per year. Annual precipitation totals 38.2 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	354 days/yr

Geography

Elevation	43 ft (13 m)
Area	89.6 sq mi (232.1 km²)
Population Density	150/sq mi
Coordinates	18.3802°N, 65.8313°W
Timezone	America/Puerto_Rico

Precipitation & Snow

Annual Rainfall 38.2"

0% below US avg

Snowfall 0.0"

Wettest Month (May) 8.15"

Driest Month (Feb) 2.76"

Air Quality

Earthquake History

22,646 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	127 km
Jan 7, 2020	4 km SSE of Indios, Puerto Rico	M6.4	114 km
Oct 17, 2001	112 km N of Charlotte Amalie, U.S. Virgin Islands	M6.0	144 km
Jan 11, 2020	5 km SE of Maria Antonia, Puerto Rico	M5.9	118 km
May 16, 2010	4 km E of Moca, Puerto Rico	M5.8	131 km
Jan 6, 2020	14 km S of Indios, Puerto Rico	M5.8	119 km
Jan 7, 2020	11 km S of Tallaboa, Puerto Rico	M5.6	109 km
Oct 16, 2001	112 km N of Charlotte Amalie, U.S. Virgin Islands	M5.6	147 km
Jan 7, 2020	0 km NW of Magas Arriba, Puerto Rico	M5.6	107 km
Feb 4, 2008	Puerto Rico region	M5.5	134 km
May 2, 2020	6 km S of Tallaboa, Puerto Rico	M5.4	107 km
Aug 1, 1993	68 km SSE of Emajagua, Puerto Rico	M5.3	110 km
Nov 23, 1992	28 km NNW of San Antonio, Puerto Rico	M5.3	147 km
Jul 3, 2020	9 km SSE of La Parguera, Puerto Rico	M5.3	135 km
Jan 10, 2020	4 km S of Maria Antonia, Puerto Rico	M5.2	122 km
Jan 11, 2020	19 km S of Indios, Puerto Rico	M5.2	119 km
Jan 15, 2020	Puerto Rico region	M5.2	136 km
Mar 12, 2009	66 km N of Brenas, Puerto Rico	M5.1	95 km
Sep 6, 2004	122 km NNE of Vieques, Puerto Rico	M5.1	127 km
Aug 14, 2009	92 km N of Suárez, Puerto Rico	M5.1	98 km

Source: USGS (M2.5+, 1990–2025)

Hurricane History

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

Year	Name	Category	Closest
2025	Erin	Category 5	202 km
2024	Ernesto	Category 1	222 km
2023	Tammy	Category 1	274 km
2022	Fiona	Category 1	130 km
2019	Dorian	Category 1	68 km
2017	Maria	Category 5	43 km
2017	Irma	Category 5	74 km
2017	Jose	Category 4	287 km
2014	Gonzalo	Category 3	195 km
2011	Irene	Category 1	21 km
2010	Earl	Category 4	147 km
2008	Omar	Category 4	170 km
2004	Frances	Category 4	225 km
2004	Jeanne	Category 1	230 km
2000	Debby	Category 1	65 km
1999	Lenny	Category 4	154 km
1999	Jose	Category 1	217 km
1998	Georges	Category 3	31 km
1996	Bertha	Category 3	77 km
1996	Hortense	Category 1	112 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	90 km
1918	PUERTO RICO: MONA PASSAGE	Eruption + Earthquake	6.1 m	144	148 km
1868	VIRGIN ISLANDS	Earthquake	1.5 m	—	83 km
2020	PUERTO RICO	Earthquake	0.1 m	4	114 km
1918	PUERTO RICO	Earthquake	—	—	146 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	61 km
2007	UNNAMED	3,896	61 km
2005	UNNAMED	1,888	58 km
2005	PISTA DE SALINAS CARR 3	1,137	66 km
2005	UNNAMED	725	57 km
2013	PUERTO NEGRO	631	57 km

Source: NIFC/IRWIN (100+ acres)

Monthly Weather

Month	Avg Temperature	Precipitation	Summary
January	76°F (25°C)	3.7 in
February	75°F (24°C)	2.8 in	Coldest, Driest
March	76°F (24°C)	3.2 in
April	77°F (25°C)	4.8 in
May	79°F (26°C)	8.2 in	Wettest
June	80°F (27°C)	5.7 in
July	83°F (28°C)	5.6 in	Warmest
August	81°F (27°C)	7.1 in
September	81°F (27°C)	7.4 in
October	80°F (27°C)	8.0 in
November	78°F (26°C)	7.4 in
December	76°F (24°C)	5.8 in

Río Grande has a seasonal temperature swing of 8°F / from 75°F in February to 83°F in July. Total annual precipitation is 69.7 inches, with May being the wettest month (8.2") and February the driest (2.8").

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