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San Isidro, TX
Full City Profile · Texas · Starr County County
1.6
/5.0
D
Poor
198
Population
64/sq mi density
$46,400
Home Value
$340,974 Zillow
73°F
Avg Temperature
323 sunny days/yr
65
Violent Crime/100K
1,652 property/100K
D
Overall
1.6 / 5.0
Below average overall score based on economy, affordability, safety and education
F
Safety
1.0 / 5.0
65 violent crimes/100K
C
Education
2.2 / 5.0
15.6% bachelor's degree or higher
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. Annual precipitation totals 19.8 inches. Air quality is rated Good with a median AQI of 42.
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)
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").