What is the air quality in San Marcos today?

The current Air Quality Index (AQI) in San Marcos is 30 (Good). PM2.5 concentration is 7.2 µg/m³.

What is the temperature in San Marcos right now?

The current temperature in San Marcos is 24.7°C (feels like 24.7°C). Humidity is 26.5% and wind speed is 103.6 km/h.

Is it safe to go outside in San Marcos?

Air quality is satisfactory. Enjoy outdoor activities. The UV Index is 0.0 (Low).

Air Quality in San Marcos, United States

Windy

24.7°C · 26.5% humidity

24.7°

Feels 24.7°

Good

Air quality is satisfactory. Enjoy outdoor activities.

1 station

Nearby Monitoring Stations

AQI Forecast

— 12pm

—

— 3pm

—

— 6pm

—

— 9pm

—

— 12am

—

— 3am

—

— 6am

—

— 9am

—

Air Quality Index Trend

43h · 2 stn

View full history →

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.

26.5%

Humidity

103.6 km/h

Wind NNE

1022.8 hPa

Pressure

0.0

UV Low

GoodModerateUSGUnhealthyVery UnhealthyHazardous

Which pollutant is driving the AQI?

PM2.5▲

7.2 µg/m³

PM10

27.4 µg/m³

050100150200300500

What is the weather forecast for San Marcos?

Temperature & Precipitation

PM2.5 Trend

43h · 2 stations

PM2.57.2 µg/m³ ✓ WHO

Good

PM1027.4 µg/m³

Good

UV INDEX0.0

Low

Station readings (1 station within 25 km)

7.2

Median

7.2

Average

7.2

Low

7.2

High

PM2.5 µg/m³ · Model: 8.2 · Bias: +1.0

What is the 7-day forecast for San Marcos?

10-20

24.7° 8.3°

0.56 mm

10-21

24.7° 14.0°

10-22

26.5° 15.3°

10-23

27.5° 13.5°

6.0 mm

10-24

29.2° 18.7°

10-25

23.2° 14.3°

10-26

26.9° 10.7°

4.63 mm

Both models agree Avg diff: 3.7°C

Where are air quality stations near San Marcos?

CAPCOG San Marcos Staples Road

2.6 km PM2.5: 7.2 µg/m³

What cities are near San Marcos?

30 Kyle 34 New Braunfels 32 Canyon Lake 33 Seguin 43 Cibolo 22 Austin 45 Schertz 25 University of Texas 46 Universal City 48 Live Oak

Get AQI alerts for San Marcos

Notify me when air quality reaches:

ModerateAQI > 50 Unhealthy for Sensitive GroupsAQI > 100 UnhealthyAQI > 150 Very UnhealthyAQI > 200

Free · No account · Unsubscribe any time

Data sources: AQI from ground-level monitoring stations via AQICN. Weather forecast from ECMWF (IFS & CAMS models). AQI calculated using US EPA standard. Updated 2026-10-20T20:58 UTC.