Air Quality in San Marcos, United States

Drizzle
21.3°C · 65.6% humidity
21.3°
Feels 21.3°
62
Moderate
Unusually sensitive people should consider reducing prolonged outdoor exertion.
1 station

Nearby Monitoring Stations

AQI Forecast Calibrated
40 10pm
22
8
21 1am
21
33
33 4am
33
33
33 7am
33
33
33 10am
33
33
21 1pm
21
21
21 4pm
21
21
21 7pm
8
8
Station readings
40
22
8
CAMS model adj -4
25
25
25
25
25
37
37
37
37
37
37
37
37
37
37
25
25
25
25
25
25
25
12
12
AD 728×90

PM2.5 Trend (24h)

27h · 2 stations
65.6%
Humidity
87.6 km/h
Wind SE
1015.9 hPa
Pressure
0.7
UV Low
GoodModerateUSGUnhealthyVery UnhealthyHazardous

What is the weather forecast for San Marcos?

Temperature & Precipitation

PM2.517.1 µg/m³ ×1.1 WHO
Moderate
PM1013.7 µg/m³
Good
UV INDEX0.7
Low
AD 300×250
Station readings (1 station within 25 km)
17.1
Median
17.1
Average
17.1
Low
17.1
High
PM2.5 µg/m³ · Model: 5.9 · Bias: -11.2

What is the 7-day forecast for San Marcos?

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
04-16
26.8° 19.6°
8.25 mm
Both models agree Avg diff: 2.3°C

Where are air quality stations near San Marcos?

62
CAPCOG San Marcos Staples Road
2.6 km PM2.5: 17.1 µg/m³
–
New Braunfels Oak Run Parkway
28.8 km PM10: 5.7 µg/m³

What cities are near San Marcos?

64 Kyle 30 New Braunfels 3 Canyon Lake 38 Seguin 33 Cibolo 30 Austin 33 Schertz 28 University of Texas 33 Universal City 23 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 2026-04-10T01:01 UTC.