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Weather & Climate in South Alamo, TX
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
South Alamo has a warm climate with an average annual temperature of 76°F (24°C). Winters average 60°F in January while summers reach 87°F in July. The area gets 323 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 18.7 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 102 feet.
Temperature
60°F Jan (16°C)
87°F Jul (31°C)
| Annual Average | 75.5°F |
| 40% above US avg | |
| January Average | 60°F (16°C) |
| July Average | 87°F (31°C) |
| Sunny Days | 323 days/yr |
Geography
| Elevation | 102 ft (31 m) |
| Area | 2.0 sq mi (5.3 km²) |
| Population Density | 1,526/sq mi |
| Coordinates | 26.1518°N, 98.1079°W |
| Timezone | America/Chicago |
| County | Hidalgo County County |
| Nearest Airport | Mc Allen International (MFE) 7 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 42.0 |
| Rating | Good |
Natural Hazard Risk
| Overall Risk | Relatively High |
| Risk Score | 99.0 / 100 |
| Social Vulnerability | 92.7 / 100 |
| Community Resilience | 0.9 / 100 |
Hazard Breakdown
| Tornado | Relatively High |
| Hurricane | Very High |
| Earthquake | Relatively Low |
| Wildfire | Relatively Low |
| Flood | Relatively High |
| Hail | Very High |
| Strong Wind | Relatively High |
| Heat Wave | Relatively High |
| Winter Weather | Relatively High |
| Lightning | Relatively High |
| Ice Storm | Very High |
| Drought | Relatively High |
| Cold Wave | Very High |
| Landslide | Very Low |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Earthquake History
5 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M4.1.
| Jan 19, 2014 | 12 km SSW of China, Mexico | M4.1 | 133 km | 12 km |
| Feb 11, 2014 | 31 km SSE of China, Mexico | M4.0 | 130 km | 41 km |
| Mar 2, 2014 | 15 km SW of China, Mexico | M4.0 | 138 km | 8 km |
| Mar 5, 2014 | 18 km SSW of China, Mexico | M3.9 | 135 km | 10 km |
| Nov 26, 2013 | 22 km S of China, Mexico | M3.6 | 134 km | 37 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Hurricane History
13 hurricanes (Category 1+) recorded within 500 km since 1980. Strongest on record: Category 5.
| Year | Name | Category | Max Wind | Closest |
| 2024 | Beryl | Category 1 | 92 mph | 286 km |
| 2021 | Nicholas | Category 1 | 75 mph | 279 km |
| 2020 | Hanna | Category 1 | 92 mph | 51 km |
| 2017 | Harvey | Category 4 | 132 mph | 208 km |
| 2010 | Alex | Category 2 | 109 mph | 218 km |
| 2008 | Dolly | Category 2 | 98 mph | 49 km |
| 2005 | Emily | Category 3 | 127 mph | 139 km |
| 2003 | Claudette | Category 1 | 92 mph | 297 km |
| 2003 | Erika | Category 1 | 75 mph | 117 km |
| 1999 | Bret | Category 4 | 144 mph | 93 km |
| 1988 | Gilbert | Category 4 | 132 mph | 186 km |
| 1983 | Barry | Category 1 | 81 mph | 103 km |
| 1980 | Allen | Category 5 | 161 mph | 58 km |
Source: NOAA IBTrACS (Category 1+, 1980–2026).
Tornado History
130 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF3. Total: 1 fatality, 39 injuries.
| Date | Rating | Distance | Path | Fatalities |
| Mar 15, 1983 | EF3 | 24 km | 6.1 mi | 0 |
| May 12, 1969 | EF3 | 51 km | 0.1 mi | 0 |
| May 12, 1969 | EF3 | 43 km | 0.1 mi | 0 |
| Apr 19, 1965 | EF3 | 65 km | 1.5 mi | 0 |
| May 5, 1991 | EF2 | 55 km | 1.0 mi | 0 |
| Aug 9, 1980 | EF2 | 59 km | 4.6 mi | 0 |
| May 24, 1970 | EF2 | 51 km | 25.5 mi | 0 |
| May 12, 1969 | EF2 | 70 km | 0.1 mi | 0 |
| Apr 26, 1967 | EF2 | 37 km | 40.2 mi | 0 |
| Jun 1, 1962 | EF2 | 48 km | 1.0 mi | 0 |
| Jan 26, 1950 | EF2 | 81 km | 4.7 mi | 0 |
| May 13, 2023 | EF1 | 85 km | 0.5 mi | 1 |
| Oct 30, 2015 | EF1 | 50 km | 0.7 mi | 0 |
| Jun 30, 2011 | EF1 | 9 km | 0.4 mi | 0 |
| Jul 16, 2007 | EF1 | 13 km | 1.0 mi | 0 |
| Apr 30, 2003 | EF1 | 35 km | 0.3 mi | 0 |
| May 21, 2001 | EF1 | 23 km | 0.2 mi | 0 |
| May 21, 2001 | EF1 | 24 km | 0.1 mi | 0 |
| Apr 4, 1997 | EF1 | 67 km | 0.5 mi | 0 |
| Jun 14, 1994 | EF1 | 47 km | 0.5 mi | 0 |
Source: NOAA Storm Prediction Center (EF0+, 1950–2024, US only).
Wildfire History
20 wildfires (100+ acres) recorded within 100 km. Largest: BURNS RANCH FIRE (58,395 acres, 2008).
| Year | Name | Acres Burned | Distance |
| 2008 | BURNS RANCH FIRE | 58,395 | 63 km |
| 2022 | HAYFIELD SOUTH | 11,038 | 79 km |
| 2021 | KING | 9,793 | 83 km |
| 2022 | VIB | 7,817 | 86 km |
| 2022 | POLO | 5,571 | 83 km |
| 2008 | ENCINO | 3,979 | 82 km |
| 2008 | UNNAMED | 3,389 | 96 km |
| 2011 | KING RANCH | 3,075 | 72 km |
| 2008 | JONES RANCH | 2,998 | 97 km |
| 2009 | SAN CARLOS | 2,849 | 89 km |
| 2021 | JONES | 2,178 | 95 km |
| 2010 | ENCINITOS RANCH | 1,967 | 73 km |
| 2022 | 755 | 1,846 | 85 km |
| 2011 | ENCINITOS | 1,748 | 73 km |
| 2022 | DEER | 1,657 | 96 km |
| 2009 | STILLMAN | 1,466 | 61 km |
| 2023 | ELECTRIC SLIDE | 1,410 | 86 km |
| 2008 | SAN RAFAEL RANCH | 1,407 | 85 km |
| 2005 | BORREGO | 1,392 | 96 km |
| 2008 | 281 | 1,308 | 84 km |
Source: NIFC/IRWIN Wildfire Records (100+ acres).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 60°F (16°C) | 1.5 in | Coldest |
| February | 62°F (17°C) | 1.3 in | |
| March | 69°F (21°C) | 0.6 in | Driest |
| April | 75°F (24°C) | 1.3 in | |
| May | 79°F (26°C) | 2.9 in | |
| June | 83°F (28°C) | 2.8 in | |
| July | 87°F (31°C) | 2.1 in | Warmest |
| August | 85°F (30°C) | 2.4 in | |
| September | 82°F (28°C) | 4.3 in | Wettest |
| October | 75°F (24°C) | 2.2 in | |
| November | 68°F (20°C) | 1.1 in | |
| December | 61°F (16°C) | 1.1 in |
South Alamo has a seasonal temperature swing of 27°F / from 60°F in January to 87°F in July. Total annual precipitation is 23.8 inches, with September being the wettest month (4.3") and March the driest (0.6").