Air Quality in San Marcos, United States

Windy
35.6°C · 35.6% humidity
35.6°
Feels 35.6°
25
Good
Air quality is satisfactory. Enjoy outdoor activities.
Model forecast

Nearby Monitoring Stations

AQI Forecast
25 7am
25
25
25 10am
25
25
25 1pm
25
25
25 4pm
25
25
25 7pm
25
25
25 10pm
25
25
25 1am
25
25
25 4am
25
25
AD 728×90

Air Quality Index Trend

41h · 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.

35.6%
Humidity
77.8 km/h
Wind S
1015.2 hPa
Pressure
9.4
UV Very High
GoodModerateUSGUnhealthyVery UnhealthyHazardous

Which pollutant is driving the AQI?

PM2.5▲
25
6.0 µg/m³
PM10
13
13.7 µg/m³
050100150200300500

What is the weather forecast for San Marcos?

Temperature & Precipitation

PM2.5 Trend

41h · 2 stations
PM2.56.0 µg/m³ ✓ WHO
Good
PM1013.7 µg/m³
Good
UV INDEX9.4
Very High
AD 300×250

What is the 7-day forecast for San Marcos?

09-05
37.9° 21.8°
09-06
37.8° 22.9°
0.06 mm
09-07
38.5° 23.9°
0.13 mm
09-08
36.6° 22.5°
0.25 mm
09-09
36.9° 25.9°
0.13 mm
09-10
35.8° 18.8°
0.44 mm
09-11
37.0° 23.7°
0.06 mm
Both models agree Avg diff: 2.5°C

Where are air quality stations near San Marcos?

–
CAPCOG San Marcos Staples Road
2.6 km PM2.5: -3.0 µg/m³
–
New Braunfels Oak Run Parkway
28.8 km PM10: 15.2 µg/m³

What cities are near San Marcos?

25 Kyle 20 New Braunfels 19 Canyon Lake 20 Seguin 27 Cibolo 30 Austin 29 Schertz 28 University of Texas 28 Universal City 27 Live Oak
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Data sources: Weather forecast from ECMWF (IFS & CAMS models). AQI calculated using US EPA standard. Updated 2026-09-05T15:10 UTC.