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Weather & Climate in San Ygnacio, TX
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
San Ygnacio has a warm climate with an average annual temperature of 74°F (24°C). Winters average 57°F in January while summers reach 87°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 20.4 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 362 feet.
Temperature
57°F Jan (14°C)
87°F Jul (31°C)
| Annual Average | 74.4°F |
| 38% above US avg | |
| January Average | 57°F (14°C) |
| July Average | 87°F (31°C) |
| Sunny Days | 312 days/yr |
Geography
| Elevation | 362 ft (110 m) |
| Area | 1.7 sq mi (4.3 km²) |
| Population Density | 326/sq mi |
| Coordinates | 27.0532°N, 99.4237°W |
| Timezone | America/Chicago |
| County | Webb County County |
| Nearest Airport | Laredo International (LRD) 34 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
1 earthquake (M2.5+) recorded within 150 km since 1990. Strongest on record: M3.6.
| Aug 30, 2016 | 11 km N of Los Ramones, Mexico | M3.6 | 141 km | 38 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Hurricane History
9 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 | 150 km |
| 2017 | Harvey | Category 4 | 132 mph | 262 km |
| 2008 | Dolly | Category 2 | 98 mph | 173 km |
| 2005 | Emily | Category 3 | 127 mph | 240 km |
| 2003 | Erika | Category 1 | 75 mph | 275 km |
| 1999 | Bret | Category 4 | 138 mph | 131 km |
| 1988 | Gilbert | Category 1 | 92 mph | 280 km |
| 1983 | Barry | Category 1 | 81 mph | 266 km |
| 1980 | Allen | Category 4 | 127 mph | 50 km |
Source: NOAA IBTrACS (Category 1+, 1980–2026).
Tornado History
18 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF2. Total: 40 injuries.
| Date | Rating | Distance | Path | Fatalities |
| Jun 29, 1971 | EF2 | 59 km | 0.3 mi | 0 |
| May 23, 1970 | EF2 | 22 km | 4.5 mi | 0 |
| May 23, 1970 | EF2 | 23 km | 4.5 mi | 0 |
| Apr 5, 1961 | EF2 | 26 km | 2.5 mi | 0 |
| Sep 7, 1956 | EF2 | 22 km | 0.1 mi | 0 |
| Jul 2, 2010 | EF1 | 79 km | 1.9 mi | 0 |
| May 22, 1977 | EF1 | 81 km | 0.1 mi | 0 |
| May 22, 1977 | EF1 | 37 km | 0.1 mi | 0 |
| May 13, 2015 | EF0 | 92 km | 0.6 mi | 0 |
| May 10, 2012 | EF0 | 54 km | 0.1 mi | 0 |
| Jun 3, 2009 | EF0 | 98 km | 1.4 mi | 0 |
| Jul 20, 2005 | EF0 | 79 km | 2.0 mi | 0 |
| Jul 20, 2005 | EF0 | 39 km | 0.1 mi | 0 |
| Jul 20, 2005 | EF0 | 72 km | 1.0 mi | 0 |
| Apr 2, 2004 | EF0 | 77 km | 0.1 mi | 0 |
| May 17, 2002 | EF0 | 26 km | 2.0 mi | 0 |
| May 2, 2000 | EF0 | 86 km | 0.1 mi | 0 |
| Sep 10, 1962 | EF0 | 26 km | 1.8 mi | 0 |
Source: NOAA Storm Prediction Center (EF0+, 1950–2024, US only).
Wildfire History
18 wildfires (100+ acres) recorded within 100 km. Largest: JENNINGS (3,494 acres, 2023).
| Year | Name | Acres Burned | Distance |
| 2023 | JENNINGS | 3,494 | 22 km |
| 2008 | UNNAMED | 3,389 | 78 km |
| 2008 | DANA | 3,127 | 73 km |
| 2008 | JONES RANCH | 2,998 | 79 km |
| 2005 | 2686 | 2,979 | 65 km |
| 2008 | 285 FIRE | 2,820 | 97 km |
| 2008 | UNNAMED | 2,570 | 98 km |
| 2022 | GROOVE | 2,299 | 91 km |
| 2008 | UNNAMED | 1,633 | 91 km |
| 2023 | FLORIDA | 1,514 | 89 km |
| 2008 | SAN RAFAEL RANCH | 1,407 | 93 km |
| 2005 | BORREGO | 1,392 | 78 km |
| 2004 | ROMAN COMPLEX | 1,241 | 66 km |
| 2004 | SAN ISIDRO | 1,181 | 90 km |
| 2023 | WAGGNER | 1,099 | 92 km |
| 2011 | BOLT | 1,067 | 87 km |
| 2008 | DUVAL COUNTY | 1,048 | 95 km |
| 2022 | MILLER | 1,005 | 86 km |
Source: NIFC/IRWIN Wildfire Records (100+ acres).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 57°F (14°C) | 0.9 in | Coldest |
| February | 60°F (16°C) | 0.9 in | |
| March | 69°F (20°C) | 0.8 in | |
| April | 75°F (24°C) | 1.6 in | |
| May | 81°F (27°C) | 2.7 in | |
| June | 86°F (30°C) | 2.1 in | |
| July | 87°F (31°C) | 1.2 in | Warmest |
| August | 87°F (31°C) | 2.1 in | |
| September | 84°F (29°C) | 3.1 in | Wettest |
| October | 76°F (24°C) | 2.0 in | |
| November | 66°F (19°C) | 1.0 in | |
| December | 59°F (15°C) | 0.7 in | Driest |
San Ygnacio has a seasonal temperature swing of 30°F / from 57°F in January to 87°F in July. Total annual precipitation is 19.0 inches, with September being the wettest month (3.1") and December the driest (0.7").