Air Quality in San Marcos, United States

Drizzle
20.7°C · 53.1% humidity
20.7°
Feels 20.7°
28
Good
Air quality is satisfactory. Enjoy outdoor activities.
1 station

Nearby Monitoring Stations

AQI Forecast Calibrated
40 3pm
14
28
25 6pm
31
19
19 9pm
19
19
19 12am
19
19
31 3am
31
31
31 6am
31
31
31 9am
31
31
31 12pm
19
19
Station readings
40
14
28
25
CAMS model adj -6
37
37
37
37
37
25
25
25
25
25
25
25
37
37
37
37
37
37
37
37
37
37
25
25
AD 728×90

PM2.5 Trend (24h)

27h · 2 stations
53.1%
Humidity
89.9 km/h
Wind SSE
1018.6 hPa
Pressure
0.7
UV Low
GoodModerateUSGUnhealthyVery UnhealthyHazardous

What is the weather forecast for San Marcos?

Temperature & Precipitation

PM2.56.6 µg/m³ ✓ WHO
Good
PM1013.7 µg/m³
Good
UV INDEX0.7
Low
AD 300×250
Station readings (1 station within 25 km)
6.6
Median
6.6
Average
6.6
Low
6.6
High
PM2.5 µg/m³ · Model: 5.9 · Bias: -0.7

What is the 7-day forecast for San Marcos?

04-09
20.7° 14.2°
0.5 mm
04-10
21.9° 15.3°
1.25 mm
04-11
25.3° 15.4°
0.81 mm
04-12
27.3° 17.4°
0.44 mm
04-13
28.7° 19.5°
04-14
28.1° 18.9°
04-15
29.8° 19.9°
0.13 mm
Both models agree Avg diff: 2.8°C

Where are air quality stations near San Marcos?

28
CAPCOG San Marcos Staples Road
2.6 km PM2.5: 6.6 µg/m³
–
New Braunfels Oak Run Parkway
28.8 km PM10: 6.0 µg/m³

What cities are near San Marcos?

14 Kyle 21 New Braunfels 17 Canyon Lake 28 Seguin 27 Cibolo 50 Austin 27 Schertz 15 University of Texas 27 Universal City 22 Live Oak

Data sources: AQI from ground-level monitoring stations via AQICN. Weather forecast from ECMWF (IFS & CAMS models). AQI calculated using US EPA standard. Updated 2026-04-09T18:45 UTC.