Air Quality in San Marcos, United States

Cloudy
23.4°C · 87.5% humidity
23.4°
Feels 23.4°
34
Good
Air quality is satisfactory. Enjoy outdoor activities.
Calibrated model

Nearby Monitoring Stations

AQI Forecast
27 7pm
27
27
34 10pm
32
31
30 1am
29
28
26 4am
26
27
27 7am
27
27
34 10am
34
34
34 1pm
34
34
34 4pm
27
27
AD 728×90

Air Quality Index Trend

48h · 2 stn

San Marcos's air quality is primarily affected by vehicle emissions and industrial activity. Seasonal wildfire smoke and weather patterns can cause periodic air quality deterioration.

87.5%
Humidity
39.2 km/h
Wind SSW
1012.9 hPa
Pressure
0.7
UV Low
GoodModerateUSGUnhealthyVery UnhealthyHazardous

Which pollutant is driving the AQI?

PM2.5▲
34
8.16 µg/m³
PM10
13
13.7 µg/m³
050100150200300500

What is the weather forecast for San Marcos?

Temperature & Precipitation

PM2.5 Trend

48h · 2 stations
PM2.58.16 µg/m³ ✓ WHO
Good
PM1013.7 µg/m³
Good
UV INDEX0.7
Low
AD 300×250

What is the 7-day forecast for San Marcos?

06-09
34.5° 19.1°
1.19 mm
06-10
30.6° 22.2°
0.13 mm
06-11
32.4° 22.7°
06-12
33.5° 22.7°
06-13
31.6° 23.0°
1.44 mm
06-14
33.8° 22.7°
06-15
35.3° 23.3°
Both models agree Avg diff: 1.7°C

Where are air quality stations near San Marcos?

–
CAPCOG San Marcos Staples Road
2.6 km
–
New Braunfels Oak Run Parkway
28.8 km PM10: 21.8 µg/m³

What cities are near San Marcos?

42 Kyle 43 New Braunfels 29 Canyon Lake 43 Seguin 35 Cibolo 52 Austin 32 Schertz 51 University of Texas 32 Universal City 35 Live Oak
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Data sources: AQI from ground-level monitoring stations via AQICN. Weather forecast from ECMWF (IFS & CAMS models). AQI calculated using US EPA standard. Updated 2026-06-09T03:03 UTC.