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Weather & Climate in San Isidro, TX
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
San Isidro has a warm climate with an average annual temperature of 73°F (23°C). Winters average 58°F in January while summers reach 86°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 19.8 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 285 feet.
Temperature
58°F Jan (15°C)
86°F Jul (30°C)
| Annual Average | 73.4°F |
| 36% above US avg | |
| January Average | 58°F (15°C) |
| July Average | 86°F (30°C) |
| Sunny Days | 323 days/yr |
Geography
| Elevation | 285 ft (87 m) |
| Area | 3.1 sq mi (8.0 km²) |
| Population Density | 64/sq mi |
| Coordinates | 26.7136°N, 98.4479°W |
| Timezone | America/Chicago |
| County | Starr County County |
| Nearest Airport | Mc Allen International (MFE) 39 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 42.0 |
| Rating | Good |
Natural Hazard Risk
| Overall Risk | Relatively Moderate |
| Risk Score | 84.8 / 100 |
| Social Vulnerability | 97.0 / 100 |
| Community Resilience | 0.4 / 100 |
Hazard Breakdown
| Tornado | Relatively Low |
| Hurricane | Relatively Low |
| Earthquake | Very Low |
| Wildfire | Relatively Low |
| Flood | Relatively Low |
| Hail | Relatively Low |
| Strong Wind | Very Low |
| Heat Wave | Relatively Moderate |
| Winter Weather | Relatively Low |
| Lightning | Very Low |
| Ice Storm | Relatively Moderate |
| Drought | Relatively Moderate |
| Cold Wave | Very High |
| Landslide | Very Low |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Earthquake History
2 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M3.9.
| Apr 25, 2010 | 10 km WNW of Driscoll, Texas | M3.9 | 126 km | 5 km |
| Mar 24, 1997 | 4 km SSE of Alice, Texas | M3.8 | 118 km | 5 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 4.
| Year | Name | Category | Max Wind | Closest |
| 2024 | Beryl | Category 1 | 92 mph | 284 km |
| 2021 | Nicholas | Category 1 | 75 mph | 264 km |
| 2020 | Hanna | Category 1 | 92 mph | 46 km |
| 2017 | Harvey | Category 4 | 132 mph | 203 km |
| 2010 | Alex | Category 2 | 109 mph | 285 km |
| 2008 | Dolly | Category 2 | 98 mph | 69 km |
| 2005 | Emily | Category 3 | 127 mph | 192 km |
| 2003 | Claudette | Category 1 | 92 mph | 259 km |
| 2003 | Erika | Category 1 | 75 mph | 188 km |
| 1999 | Bret | Category 4 | 144 mph | 55 km |
| 1988 | Gilbert | Category 3 | 127 mph | 238 km |
| 1983 | Barry | Category 1 | 81 mph | 174 km |
| 1980 | Allen | Category 4 | 144 mph | 35 km |
Source: NOAA IBTrACS (Category 1+, 1980–2026).
Tornado History
124 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF3. Total: 68 injuries.
| Date | Rating | Distance | Path | Fatalities |
| Mar 15, 1983 | EF3 | 75 km | 6.1 mi | 0 |
| May 12, 1969 | EF3 | 94 km | 0.1 mi | 0 |
| Jun 5, 1965 | EF3 | 91 km | 1.0 mi | 0 |
| Apr 19, 1965 | EF3 | 12 km | 1.5 mi | 0 |
| May 5, 1991 | EF2 | 22 km | 1.0 mi | 0 |
| Jun 29, 1971 | EF2 | 96 km | 0.3 mi | 0 |
| May 24, 1970 | EF2 | 72 km | 25.5 mi | 0 |
| May 23, 1970 | EF2 | 84 km | 4.5 mi | 0 |
| May 23, 1970 | EF2 | 85 km | 4.5 mi | 0 |
| Apr 26, 1967 | EF2 | 57 km | 40.2 mi | 0 |
| Jun 1, 1962 | EF2 | 72 km | 1.0 mi | 0 |
| Sep 7, 1956 | EF2 | 85 km | 0.1 mi | 0 |
| Jan 26, 1950 | EF2 | 37 km | 4.7 mi | 0 |
| Oct 30, 2015 | EF1 | 86 km | 0.7 mi | 0 |
| May 27, 2014 | EF1 | 79 km | 5.3 mi | 0 |
| Jun 30, 2011 | EF1 | 71 km | 0.4 mi | 0 |
| Jul 2, 2010 | EF1 | 68 km | 1.9 mi | 0 |
| Jul 16, 2007 | EF1 | 61 km | 1.0 mi | 0 |
| Apr 30, 2003 | EF1 | 54 km | 0.3 mi | 0 |
| May 21, 2001 | EF1 | 55 km | 0.1 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 | 22 km |
| 2022 | BORREGA | 54,575 | 84 km |
| 2011 | SMAC | 19,449 | 53 km |
| 2022 | HAYFIELD SOUTH | 11,038 | 78 km |
| 2021 | KING | 9,793 | 43 km |
| 2022 | VIB | 7,817 | 45 km |
| 2017 | HOPPER | 7,150 | 41 km |
| 2018 | TRUST | 6,648 | 94 km |
| 2022 | BLANKET | 5,823 | 40 km |
| 2022 | POLO | 5,571 | 72 km |
| 2011 | GUS CANALAS | 4,316 | 78 km |
| 2008 | ENCINO | 3,979 | 38 km |
| 2023 | LAGUNA LARGA | 3,850 | 81 km |
| 2021 | NORTH JONES | 3,541 | 34 km |
| 2023 | JENNINGS | 3,494 | 90 km |
| 2008 | UNNAMED | 3,389 | 27 km |
| 2021 | BAFFIN | 3,223 | 96 km |
| 2008 | DANA | 3,127 | 77 km |
| 2011 | KING RANCH | 3,075 | 64 km |
| 2008 | JONES RANCH | 2,998 | 28 km |
Source: NIFC/IRWIN Wildfire Records (100+ acres).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 58°F (15°C) | 1.1 in | Coldest |
| February | 61°F (16°C) | 1.3 in | |
| March | 68°F (20°C) | 0.7 in | Driest |
| April | 74°F (23°C) | 1.3 in | |
| May | 80°F (27°C) | 3.1 in | |
| June | 84°F (29°C) | 3.0 in | |
| July | 86°F (30°C) | 1.7 in | Warmest |
| August | 86°F (30°C) | 2.4 in | |
| September | 82°F (28°C) | 4.1 in | Wettest |
| October | 74°F (24°C) | 2.5 in | |
| November | 66°F (19°C) | 1.0 in | |
| December | 59°F (15°C) | 1.1 in |
San Isidro has a seasonal temperature swing of 28°F / from 58°F in January to 86°F in July. Total annual precipitation is 23.3 inches, with September being the wettest month (4.1") and March the driest (0.7").