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Weather & Climate in San Isidro, Puerto Rico
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
San Isidro 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 / relatively mild seasonal variation. The area gets 354 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 38.2 inches. The city sits at an elevation of 43 feet.
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 | 0.8 sq mi (1.9 km²) |
| Population Density | 10,761/sq mi |
| Coordinates | 18.3922°N, 65.8854°W |
| Timezone | America/Puerto_Rico |
Precipitation & Snow
Air Quality
Earthquake History
22,638 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M6.4.
| Jan 13, 2014 | 61 km N of Hatillo, Puerto Rico | M6.4 | 121 km | 20 km |
| Jan 7, 2020 | 4 km SSE of Indios, Puerto Rico | M6.4 | 109 km | 6 km |
| Oct 17, 2001 | 112 km N of Charlotte Amalie, U.S. Virgin Islands | M6.0 | 147 km | 33 km |
| Jan 11, 2020 | 5 km SE of Maria Antonia, Puerto Rico | M5.9 | 113 km | 5 km |
| Jan 6, 2020 | 14 km S of Indios, Puerto Rico | M5.8 | 115 km | 6 km |
| May 16, 2010 | 4 km E of Moca, Puerto Rico | M5.8 | 125 km | 113 km |
| Jan 7, 2020 | 0 km NW of Magas Arriba, Puerto Rico | M5.6 | 103 km | 9 km |
| Jan 7, 2020 | 11 km S of Tallaboa, Puerto Rico | M5.6 | 104 km | 10 km |
| Feb 4, 2008 | Puerto Rico region | M5.5 | 128 km | 15 km |
| Dec 11, 2000 | 65 km N of Isabela, Puerto Rico | M5.5 | 149 km | 53 km |
| May 2, 2020 | 6 km S of Tallaboa, Puerto Rico | M5.4 | 102 km | 9 km |
| Jul 3, 2020 | 9 km SSE of La Parguera, Puerto Rico | M5.3 | 130 km | 3 km |
| Nov 23, 1992 | 28 km NNW of San Antonio, Puerto Rico | M5.3 | 141 km | 31 km |
| Aug 1, 1993 | 68 km SSE of Emajagua, Puerto Rico | M5.3 | 112 km | 25 km |
| Jan 11, 2020 | 19 km S of Indios, Puerto Rico | M5.2 | 115 km | 10 km |
| Jan 15, 2020 | Puerto Rico region | M5.2 | 131 km | 5 km |
| Jan 10, 2020 | 4 km S of Maria Antonia, Puerto Rico | M5.2 | 117 km | 9 km |
| Sep 6, 2004 | 122 km NNE of Vieques, Puerto Rico | M5.1 | 128 km | 14 km |
| Aug 14, 2009 | 92 km N of Suárez, Puerto Rico | M5.1 | 98 km | 47 km |
| May 11, 1996 | 107 km N of Charlotte Amalie, U.S. Virgin Islands | M5.1 | 142 km | 36 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Hurricane History
27 hurricanes (Category 1+) recorded within 500 km since 1980. Strongest on record: Category 5.
| Year | Name | Category | Max Wind | Closest |
| 2025 | Erin | Category 5 | 161 mph | 203 km |
| 2024 | Ernesto | Category 1 | 75 mph | 217 km |
| 2023 | Tammy | Category 1 | 86 mph | 278 km |
| 2022 | Fiona | Category 1 | 92 mph | 126 km |
| 2019 | Dorian | Category 1 | 86 mph | 70 km |
| 2017 | Maria | Category 5 | 173 mph | 40 km |
| 2017 | Irma | Category 5 | 178 mph | 76 km |
| 2017 | Jose | Category 4 | 132 mph | 290 km |
| 2014 | Gonzalo | Category 3 | 115 mph | 199 km |
| 2011 | Irene | Category 1 | 86 mph | 21 km |
| 2010 | Earl | Category 4 | 132 mph | 148 km |
| 2008 | Omar | Category 4 | 132 mph | 175 km |
| 2004 | Frances | Category 4 | 144 mph | 224 km |
| 2004 | Jeanne | Category 1 | 81 mph | 224 km |
| 2000 | Debby | Category 1 | 75 mph | 68 km |
| 1999 | Lenny | Category 4 | 155 mph | 159 km |
| 1999 | Jose | Category 1 | 75 mph | 223 km |
| 1998 | Georges | Category 3 | 121 mph | 34 km |
| 1996 | Bertha | Category 3 | 115 mph | 79 km |
| 1996 | Hortense | Category 1 | 81 mph | 110 km |
Source: NOAA IBTrACS (Category 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 | 96 km |
| 1918 | PUERTO RICO: MONA PASSAGE | Eruption + Earthquake | 6.1 m | 144 | 142 km |
| 1868 | VIRGIN ISLANDS | Earthquake | 1.5 m | — | 89 km |
| 2020 | PUERTO RICO | Earthquake | 0.1 m | 4 | 109 km |
| 1918 | PUERTO RICO | Earthquake | — | — | 140 km |
Source: NOAA/NCEI Historical Tsunami Database.
Wildfire History
6 wildfires (100+ acres) recorded within 100 km. Largest: CAMPAMENTO SANTIAGO (3,927 acres, 2005).
| Year | Name | Acres Burned | Distance |
| 2005 | CAMPAMENTO SANTIAGO | 3,927 | 57 km |
| 2007 | UNNAMED | 3,896 | 58 km |
| 2005 | UNNAMED | 1,888 | 55 km |
| 2005 | PISTA DE SALINAS CARR 3 | 1,137 | 62 km |
| 2005 | UNNAMED | 725 | 55 km |
| 2013 | PUERTO NEGRO | 631 | 63 km |
Source: NIFC/IRWIN Wildfire Records (100+ acres).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 76°F (25°C) | 3.5 in | |
| February | 75°F (24°C) | 2.7 in | Coldest, Driest |
| March | 76°F (25°C) | 3.0 in | |
| April | 78°F (25°C) | 4.6 in | |
| May | 80°F (26°C) | 7.3 in | Wettest |
| June | 81°F (27°C) | 5.3 in | |
| July | 83°F (28°C) | 5.5 in | Warmest |
| August | 81°F (27°C) | 6.9 in | |
| September | 81°F (27°C) | 6.8 in | |
| October | 80°F (27°C) | 7.2 in | |
| November | 79°F (26°C) | 7.0 in | |
| December | 76°F (25°C) | 5.5 in |
San Isidro has a seasonal temperature swing of 8°F / from 75°F in February to 83°F in July. Total annual precipitation is 65.1 inches, with May being the wettest month (7.3") and February the driest (2.7").