Air Quality in San Marcos, United States

Cloudy
23.4°C · 87.5% humidity
23.4°
Feels 23.4°
33
Good
Air quality is satisfactory. Enjoy outdoor activities.
Calibrated model

Nearby Monitoring Stations

AQI Forecast
27 8pm
27
27
33 11pm
31
30
29 2am
29
26
26 5am
28
27
27 8am
27
34
34 11am
34
34
34 2pm
34
34
27 5pm
27
25
AD 728×90

Air Quality Index Trend

48h · 1 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▲
33
7.95 µg/m³
PM10
13
13.7 µg/m³
050100150200300500

What is the weather forecast for San Marcos?

Temperature & Precipitation

PM2.5 Trend

48h · 1 station
PM2.57.95 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: 21.9 µg/m³

What cities are near San Marcos?

49 Kyle 37 New Braunfels 30 Canyon Lake 38 Seguin 37 Cibolo 50 Austin 35 Schertz 48 University of Texas 36 Universal City 38 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 2026-06-09T04:00 UTC.