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Weather & Climate in San Lorenzo zona urbana, PR
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
San Lorenzo zona urbana has a warm climate with an average annual temperature of 77°F (25°C). Winters average 73°F in January while summers reach 80°F in July / relatively mild seasonal variation. The area gets 353 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 41.6 inches. Air quality is rated Good with a median AQI of 21 / among the cleanest air in the country. The city sits at an elevation of 337 feet.
Temperature
73°F Jan (23°C)
80°F Jul (27°C)
| Annual Average | 77.2°F |
| 43% above US avg | |
| January Average | 73°F (23°C) |
| July Average | 80°F (27°C) |
| Sunny Days | 353 days/yr |
Geography
| Elevation | 337 ft (103 m) |
| Area | 1.9 sq mi (4.8 km²) |
| Population Density | 5,071/sq mi |
| Coordinates | 18.1871°N, 65.9674°W |
| Timezone | America/Puerto_Rico |
| County | San Lorenzo Municipio County |
| Nearest Airport | Luis Munoz Marin International (SJU) 18 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 21.0 |
| Rating | Good |
Earthquake History
20,296 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M6.4.
| Jan 7, 2020 | 4 km SSE of Indios, Puerto Rico | M6.4 | 93 km | 6 km |
| Jan 13, 2014 | 61 km N of Hatillo, Puerto Rico | M6.4 | 130 km | 20 km |
| Jan 11, 2020 | 5 km SE of Maria Antonia, Puerto Rico | M5.9 | 97 km | 5 km |
| May 16, 2010 | 4 km E of Moca, Puerto Rico | M5.8 | 119 km | 113 km |
| Jan 6, 2020 | 14 km S of Indios, Puerto Rico | M5.8 | 97 km | 6 km |
| Jan 7, 2020 | 0 km NW of Magas Arriba, Puerto Rico | M5.6 | 87 km | 9 km |
| Jan 7, 2020 | 11 km S of Tallaboa, Puerto Rico | M5.6 | 86 km | 10 km |
| Feb 4, 2008 | Puerto Rico region | M5.5 | 136 km | 15 km |
| May 2, 2020 | 6 km S of Tallaboa, Puerto Rico | M5.4 | 85 km | 9 km |
| Nov 23, 1992 | 28 km NNW of San Antonio, Puerto Rico | M5.3 | 141 km | 31 km |
| Jul 3, 2020 | 9 km SSE of La Parguera, Puerto Rico | M5.3 | 114 km | 3 km |
| Aug 1, 1993 | 68 km SSE of Emajagua, Puerto Rico | M5.3 | 92 km | 25 km |
| Jan 11, 2020 | 19 km S of Indios, Puerto Rico | M5.2 | 96 km | 10 km |
| Jan 10, 2020 | 4 km S of Maria Antonia, Puerto Rico | M5.2 | 101 km | 9 km |
| Jan 15, 2020 | Puerto Rico region | M5.2 | 115 km | 5 km |
| Mar 12, 2009 | 66 km N of Brenas, Puerto Rico | M5.1 | 107 km | 15 km |
| Aug 14, 2009 | 92 km N of Suárez, Puerto Rico | M5.1 | 122 km | 47 km |
| Feb 4, 2020 | 15 km SSE of Guánica, Puerto Rico | M5.0 | 104 km | 7 km |
| Jan 7, 2020 | 14 km S of Tallaboa, Puerto Rico | M5.0 | 86 km | 10 km |
| Jan 7, 2020 | 7 km SE of Tallaboa, Puerto Rico | M5.0 | 80 km | 10 km |
Source: USGS Earthquake Catalog (M2.5+, 1990-2025). Sorted by magnitude.
Hurricane History
25 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 | 228 km |
| 2024 | Ernesto | Category 1 | 75 mph | 230 km |
| 2023 | Tammy | Category 1 | 86 mph | 298 km |
| 2022 | Fiona | Category 1 | 92 mph | 104 km |
| 2019 | Dorian | Category 1 | 86 mph | 93 km |
| 2017 | Maria | Category 5 | 173 mph | 22 km |
| 2017 | Irma | Category 5 | 178 mph | 99 km |
| 2014 | Gonzalo | Category 3 | 115 mph | 220 km |
| 2011 | Irene | Category 1 | 92 mph | 7 km |
| 2010 | Earl | Category 4 | 132 mph | 172 km |
| 2008 | Omar | Category 4 | 132 mph | 169 km |
| 2004 | Frances | Category 4 | 144 mph | 248 km |
| 2004 | Jeanne | Category 1 | 81 mph | 219 km |
| 2000 | Debby | Category 1 | 75 mph | 91 km |
| 1999 | Lenny | Category 4 | 155 mph | 151 km |
| 1999 | Jose | Category 1 | 75 mph | 229 km |
| 1998 | Georges | Category 3 | 121 mph | 20 km |
| 1996 | Bertha | Category 3 | 115 mph | 103 km |
| 1996 | Hortense | Category 1 | 81 mph | 86 km |
| 1995 | Luis | Category 4 | 144 mph | 221 km |
Source: NOAA IBTrACS (Category 1+, 1980-2026).
Tornado History
14 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF1. Total: 1 injury.
| Date | Rating | Distance | Path | Fatalities |
| May 1, 2022 | EF1 | 88 km | 0.4 mi | 0 |
| Aug 30, 1974 | EF1 | 8 km | 2.0 mi | 0 |
| May 5, 1969 | EF1 | 19 km | 1.5 mi | 0 |
| Mar 16, 2023 | EF0 | 10 km | 0.3 mi | 0 |
| Sep 30, 2019 | EF0 | 31 km | 0.1 mi | 0 |
| Mar 26, 2017 | EF0 | 23 km | 0.4 mi | 0 |
| Nov 18, 2016 | EF0 | 61 km | 0.6 mi | 0 |
| Sep 13, 2012 | EF0 | 97 km | 0.0 mi | 0 |
| Aug 25, 2000 | EF0 | 34 km | 1.0 mi | 0 |
| Feb 23, 2000 | EF0 | 25 km | 0.2 mi | 0 |
| Sep 8, 1999 | EF0 | 16 km | 0.1 mi | 0 |
| May 1, 1995 | EF0 | 29 km | - | 0 |
| Oct 7, 1969 | EF0 | 71 km | 1.0 mi | 0 |
| Jul 28, 1959 | EF0 | 83 km | 0.2 mi | 0 |
Source: NOAA Storm Prediction Center (EF0+, 1950-2024, US only).
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 | 102 km |
| 1918 | PUERTO RICO: MONA PASSAGE | Eruption + Earthquake | 6.1 m | 144 | 141 km |
| 1868 | VIRGIN ISLANDS | Earthquake | 1.5 m | - | 92 km |
| 2020 | PUERTO RICO | Earthquake | 0.1 m | 4 | 93 km |
| 1918 | PUERTO RICO | Earthquake | - | - | 135 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 | 36 km |
| 2007 | UNNAMED | 3,896 | 37 km |
| 2005 | UNNAMED | 1,888 | 32 km |
| 2005 | PISTA DE SALINAS CARR 3 | 1,137 | 42 km |
| 2005 | UNNAMED | 725 | 31 km |
| 2013 | PUERTO NEGRO | 631 | 65 km |
Source: NIFC/IRWIN Wildfire Records (100+ acres).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 73°F (23°C) | 4.5 in | Coldest |
| February | 73°F (23°C) | 3.2 in | Driest |
| March | 74°F (23°C) | 3.6 in | |
| April | 75°F (24°C) | 5.4 in | |
| May | 77°F (25°C) | 8.7 in | |
| June | 79°F (26°C) | 6.6 in | |
| July | 80°F (27°C) | 7.2 in | Warmest |
| August | 79°F (26°C) | 8.9 in | |
| September | 79°F (26°C) | 8.8 in | |
| October | 78°F (26°C) | 9.4 in | Wettest |
| November | 76°F (25°C) | 7.9 in | |
| December | 74°F (23°C) | 6.1 in |
San Lorenzo zona urbana has a seasonal temperature swing of 7°F / from 73°F in January to 80°F in July. Total annual precipitation is 80.3 inches, with October being the wettest month (9.4") and February the driest (3.2").