Air Quality in San Juan, United States
Windy
37.7°C · 30.9% humidity
37.7°
Feels 37.7°
24
Good
Air quality is satisfactory. Enjoy outdoor activities.
3 stations
Nearby Monitoring Stations
San Juan's air quality — share it
AQI Forecast
Calibrated
49
7am
49
49
24
10am
31
36
38
1pm
40
42
44
4pm
45
45
46
7pm
48
48
49
10pm
49
49
49
1am
49
49
47
4am
47
47
Station readings
35
CAMS model
adj +22
27
27
27
27
27
27
25
25
25
25
25
25
25
27
27
27
27
27
27
27
27
25
25
25
Air Quality Index Trend
4h · 1 stnSan Juan's air quality is primarily affected by vehicle emissions and industrial activity. Seasonal wildfire smoke and weather patterns can cause periodic air quality deterioration.
30.9%
Humidity
96.1 km/h
Wind SSE
1013.8 hPa
Pressure
9.4
UV Very High
GoodModerateUSGUnhealthyVery UnhealthyHazardous
Which pollutant is driving the AQI?
PM2.5▲
5.85 µg/m³
PM10
13.7 µg/m³
050100150200300500
What is the weather forecast for San Juan?
Temperature & Precipitation
PM2.5 Trend
4h · 1 stationPM2.55.85 µg/m³
✓ WHO
Good
PM1013.7 µg/m³
Good
UV INDEX9.4
Very High
Station readings (3 stations within 25 km)
5.85
Median
5.87
Average
3.4
Low
8.4
High
PM2.5 µg/m³ · Model: 6.5 · Bias: +0.6
What is the 7-day forecast for San Juan?
09-05
37.7° 26.5°
09-06
37.4° 27.2°
09-07
37.3° 26.8°
09-08
38.4° 26.9°
09-09
37.4° 25.9°
09-10
34.9° 27.0°
5.81 mm
09-11
37.0° 27.0°
Both models agree
Avg diff: 1.2°C
Where are air quality stations near San Juan?
What cities are near San Juan?
Get AQI alerts for San Juan
Notify me when air quality reaches:
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 2026-09-05T15:49 UTC.