All Countries
Weather & Climate in San Carlos I, TX
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
San Carlos I has a warm climate with an average annual temperature of 75°F (24°C). Winters average 58°F in January while summers reach 88°F in July. The area gets 312 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 21.4 inches (drier than the 38-inch national average). Air quality is rated Good with a median AQI of 42. The city sits at an elevation of 544 feet.
Temperature
58°F Jan (14°C)
88°F Jul (31°C)
| Annual Average | 74.6°F |
| 38% above US avg | |
| January Average | 58°F (14°C) |
| July Average | 88°F (31°C) |
| Sunny Days | 312 days/yr |
Geography
| Elevation | 544 ft (166 m) |
| Area | 0.1 sq mi (0.3 km²) |
| Population Density | 1,638/sq mi |
| Coordinates | 27.4900°N, 99.3729°W |
| Timezone | America/Chicago |
| County | Webb County County |
| Nearest Airport | Laredo International (LRD) 7 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 42.0 |
| Rating | Good |
Natural Hazard Risk
| Overall Risk | Relatively Moderate |
| Risk Score | 89.3 / 100 |
| Social Vulnerability | 94.3 / 100 |
| Community Resilience | 7.3 / 100 |
Hazard Breakdown
| Tornado | Relatively Moderate |
| Hurricane | Relatively Moderate |
| Earthquake | Very Low |
| Wildfire | Relatively Low |
| Flood | Relatively Moderate |
| Hail | Relatively Moderate |
| Strong Wind | Relatively Moderate |
| Heat Wave | Relatively High |
| Winter Weather | Relatively Moderate |
| Lightning | Relatively Low |
| Ice Storm | Relatively Moderate |
| Drought | Relatively Low |
| Cold Wave | Relatively High |
| Landslide | Very Low |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Earthquake History
28 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M3.8.
| Mar 24, 1997 | 4 km SSE of Alice, Texas | M3.8 | 132 km | 5 km |
| Jul 24, 2025 | 18 km E of El Indio, Texas | M3.6 | 136 km | 1 km |
| Apr 3, 2005 | 11 km NE of Guerrero, Mexico | M3.5 | 136 km | 5 km |
| Feb 20, 2022 | 3 km S of El Indio, Texas | M3.4 | 144 km | 3 km |
| Jun 24, 2012 | 16 km ESE of Tilden, Texas | M3.4 | 143 km | 5 km |
| Jan 9, 2021 | 3 km WSW of El Indio, Texas | M3.3 | 147 km | 9 km |
| Feb 18, 2021 | 7 km SSE of El Indio, Texas | M3.3 | 139 km | 7 km |
| Jul 24, 2021 | 11 km NW of Tilden, Texas | M3.1 | 136 km | 5 km |
| Jun 18, 2021 | 3 km SSW of El Indio, Texas | M3.1 | 145 km | 2 km |
| Jul 14, 2025 | 17 km SW of Charlotte, Texas | M2.8 | 150 km | 4 km |
| Mar 20, 2019 | 3 km E of Cotulla, Texas | M2.8 | 107 km | 5 km |
| Apr 13, 2023 | 7 km ESE of El Indio, Texas | M2.7 | 140 km | 9 km |
| Jun 13, 2021 | 11 km WNW of Tilden, Texas | M2.7 | 134 km | 5 km |
| Feb 14, 2025 | 19 km SW of Charlotte, Texas | M2.7 | 148 km | 7 km |
| Aug 29, 2021 | 3 km SW of El Indio, Texas | M2.7 | 147 km | 7 km |
| May 7, 2024 | 16 km ENE of El Indio, Texas | M2.6 | 144 km | 3 km |
| May 8, 2021 | 16 km ENE of El Indio, Texas | M2.6 | 145 km | 8 km |
| Jun 14, 2025 | 11 km E of Dilley, Texas | M2.6 | 133 km | 9 km |
| Aug 18, 2021 | 2 km WSW of El Indio, Texas | M2.6 | 147 km | 8 km |
| Feb 28, 2025 | 18 km SSW of Charlotte, Texas | M2.6 | 148 km | 4 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Hurricane History
8 hurricanes (Category 1+) recorded within 500 km since 1980. Strongest on record: Category 4.
| Year | Name | Category | Max Wind | Closest |
| 2020 | Hanna | Category 1 | 92 mph | 168 km |
| 2017 | Harvey | Category 4 | 132 mph | 237 km |
| 2008 | Dolly | Category 2 | 98 mph | 191 km |
| 2005 | Emily | Category 3 | 127 mph | 285 km |
| 2003 | Claudette | Category 1 | 81 mph | 272 km |
| 1999 | Bret | Category 4 | 138 mph | 133 km |
| 1983 | Barry | Category 1 | 81 mph | 298 km |
| 1980 | Allen | Category 4 | 127 mph | 3 km |
Source: NOAA IBTrACS (Category 1+, 1980–2026).
Tornado History
25 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF2. Total: 40 injuries.
| Date | Rating | Distance | Path | Fatalities |
| Jun 29, 1971 | EF2 | 38 km | 0.3 mi | 0 |
| May 23, 1970 | EF2 | 66 km | 4.5 mi | 0 |
| May 23, 1970 | EF2 | 66 km | 4.5 mi | 0 |
| Apr 5, 1961 | EF2 | 25 km | 2.5 mi | 0 |
| Sep 7, 1956 | EF2 | 66 km | 0.1 mi | 0 |
| Jun 5, 1955 | EF2 | 60 km | 3.6 mi | 0 |
| Jul 2, 2010 | EF1 | 73 km | 1.9 mi | 0 |
| Apr 8, 1993 | EF1 | 95 km | 1.0 mi | 0 |
| Jul 14, 1983 | EF1 | 62 km | 0.5 mi | 0 |
| May 22, 1977 | EF1 | 40 km | 0.1 mi | 0 |
| May 22, 1977 | EF1 | 16 km | 0.1 mi | 0 |
| Apr 16, 1971 | EF1 | 99 km | 0.3 mi | 0 |
| Apr 17, 2016 | EF0 | 96 km | 0.0 mi | 0 |
| May 13, 2015 | EF0 | 50 km | 0.6 mi | 0 |
| May 10, 2012 | EF0 | 67 km | 0.1 mi | 0 |
| Apr 25, 2006 | EF0 | 90 km | 1.0 mi | 0 |
| Jul 20, 2005 | EF0 | 71 km | 2.0 mi | 0 |
| Jul 20, 2005 | EF0 | 41 km | 0.1 mi | 0 |
| Jul 20, 2005 | EF0 | 55 km | 1.0 mi | 0 |
| Apr 4, 2004 | EF0 | 60 km | 0.2 mi | 0 |
Source: NOAA Storm Prediction Center (EF0+, 1950–2024, US only).
Wildfire History
20 wildfires (100+ acres) recorded within 100 km. Largest: HIGHWAY 322 (44,652 acres, 2008).
| Year | Name | Acres Burned | Distance |
| 2008 | HIGHWAY 322 | 44,652 | 95 km |
| 2008 | UNNAMED | 13,175 | 88 km |
| 1999 | UNNAMED | 3,532 | 77 km |
| 2023 | JENNINGS | 3,494 | 43 km |
| 2008 | UNNAMED | 3,389 | 100 km |
| 2008 | DANA | 3,127 | 62 km |
| 2008 | JONES RANCH | 2,998 | 98 km |
| 2005 | 2686 | 2,979 | 96 km |
| 2008 | 285 FIRE | 2,820 | 91 km |
| 2008 | UNNAMED | 2,570 | 60 km |
| 2009 | FARCO MINE | 2,421 | 65 km |
| 2022 | GROOVE | 2,299 | 65 km |
| 2008 | UNNAMED | 2,171 | 86 km |
| 2006 | ENCINAL | 1,900 | 60 km |
| 2008 | UNNAMED | 1,633 | 85 km |
| 2023 | FLORIDA | 1,514 | 85 km |
| 2003 | UNNAMED | 1,411 | 80 km |
| 2005 | BORREGO | 1,392 | 100 km |
| 2004 | ROMAN COMPLEX | 1,241 | 98 km |
| 2018 | MINE | 1,224 | 65 km |
Source: NIFC/IRWIN Wildfire Records (100+ acres).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 58°F (14°C) | 0.9 in | Coldest |
| February | 60°F (16°C) | 1.0 in | |
| March | 68°F (20°C) | 0.7 in | Driest |
| April | 75°F (24°C) | 1.7 in | |
| May | 81°F (27°C) | 2.7 in | |
| June | 85°F (30°C) | 2.2 in | |
| July | 88°F (31°C) | 1.2 in | Warmest |
| August | 87°F (30°C) | 2.0 in | |
| September | 83°F (28°C) | 2.9 in | Wettest |
| October | 75°F (24°C) | 2.1 in | |
| November | 65°F (18°C) | 1.1 in | |
| December | 58°F (14°C) | 0.8 in |
San Carlos I has a seasonal temperature swing of 31°F / from 58°F in January to 88°F in July. Total annual precipitation is 19.3 inches, with September being the wettest month (2.9") and March the driest (0.7").