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San Marcos, TX
Full City Profile · Texas · Caldwell County County
3.0
/5.0
B
Good
68,920
Population
1,726/sq mi density
$51,030
Median Income
$26,576 per capita
$269,700
Home Value
$309,553 Zillow
$1,299
Median Rent
38.7% income on rent
69°F
Avg Temperature
300 sunny days/yr
364
Violent Crime/100K
2,308 property/100K
B
Overall
3.0 / 5.0
Good overall score based on economy, affordability, safety and education
B
Economy
3.4 / 5.0
$51,030 median income, 4.1% unemployment
B+
Affordability
3.7 / 5.0
$269,700 home value, $1,299/mo rent
F
Safety
1.0 / 5.0
364 violent crimes/100K
B+
Education
4.0 / 5.0
37.3% bachelor's degree or higher
San Marcos enjoys a temperate climate with an average annual temperature of 69°F (21°C). Winters average 51°F in January while summers reach 85°F in July. The area gets 300 sunny days per year. Annual precipitation totals 36.6 inches. The area receives 0.0 inches of snow annually. Air quality is rated Good with a median AQI of 42.
Temperature
51°F Jan (10°C)
85°F Jul (29°C)
| Annual Average | 68.6°F |
| 27% above US avg | |
| January Average | 51°F (10°C) |
| July Average | 85°F (29°C) |
| Sunny Days | 300 days/yr |
Geography
| Elevation | 584 ft (178 m) |
| Area | 39.9 sq mi (103.4 km²) |
| Population Density | 1,726/sq mi |
| Coordinates | 29.8724°N, 97.9360°W |
| Timezone | America/Chicago |
| County | Caldwell County County |
| Nearest Airport | Austin-Bergstrom International (AUS) 27 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 42.0 |
| Rating | Good |
Natural Hazard Risk
| Overall Risk | Relatively Low |
| Risk Score | 79.8 / 100 |
| Social Vulnerability | 64.7 / 100 |
| Community Resilience | 9.0 / 100 |
Hazard Breakdown
| Tornado | Relatively Moderate |
| Hurricane | Relatively Low |
| Earthquake | Very Low |
| Wildfire | Relatively Low |
| Flood | Relatively Moderate |
| Hail | Relatively Moderate |
| Strong Wind | Relatively High |
| Heat Wave | Relatively Low |
| Winter Weather | Relatively Moderate |
| Lightning | Relatively Moderate |
| Ice Storm | Relatively Low |
| Drought | Relatively Moderate |
| Cold Wave | Relatively Low |
| Landslide | Very Low |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 51°F (10°C) | 2.1 in | Coldest |
| February | 53°F (12°C) | 2.2 in | |
| March | 61°F (16°C) | 1.9 in | Driest |
| April | 67°F (20°C) | 2.8 in | |
| May | 74°F (24°C) | 5.0 in | Wettest |
| June | 80°F (27°C) | 4.3 in | |
| July | 85°F (29°C) | 1.9 in | Warmest |
| August | 84°F (29°C) | 2.4 in | |
| September | 78°F (26°C) | 3.6 in | |
| October | 69°F (21°C) | 3.5 in | |
| November | 59°F (15°C) | 2.9 in | |
| December | 51°F (11°C) | 2.1 in |
San Marcos has a seasonal temperature swing of 34°F / from 51°F in January to 85°F in July. Total annual precipitation is 34.7 inches, with May being the wettest month (5.0") and March the driest (1.9").