Air Quality in San Juan, United States
Windy
25.0°C · 94.3% humidity
25.0°
Feels 25.0°
12
Good
Air quality is satisfactory. Enjoy outdoor activities.
2 stations
Nearby Monitoring Stations
San Juan's air quality — share it
AQI Forecast
27
6am
27
34
12
9am
11
16
19
12pm
21
23
24
3pm
25
25
26
6pm
26
24
25
9pm
25
25
25
12am
25
25
25
3am
25
25
Air Quality Index Trend
44h · 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.
94.3%
Humidity
47.2 km/h
Wind SE
1009.7 hPa
Pressure
4.4
UV Moderate
GoodModerateUSGUnhealthyVery UnhealthyHazardous
Which pollutant is driving the AQI?
PM2.5
2.76 µg/m³
PM10▲
13.7 µg/m³
050100150200300500
What is the weather forecast for San Juan?
Temperature & Precipitation
PM2.5 Trend
44h · 1 stationPM2.52.76 µg/m³
✓ WHO
Good
PM1013.7 µg/m³
Good
UV INDEX4.4
Moderate
Station readings (2 stations within 25 km)
2.76
Median
3.2
Average
1.4
Low
5.0
High
PM2.5 µg/m³ · Model: 7.35 · Bias: +4.6
What is the 7-day forecast for San Juan?
05-29
33.8° 24.1°
0.81 mm
05-30
31.9° 23.1°
0.06 mm
05-31
33.3° 22.4°
0.06 mm
06-01
36.1° 23.8°
06-02
33.5° 23.5°
06-03
33.6° 23.9°
06-04
33.4° 23.9°
0.13 mm
Both models agree
Avg diff: 1.8°C
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Data sources: AQI from ground-level monitoring stations via AQICN. Weather forecast from ECMWF (IFS & CAMS models). AQI calculated using US EPA standard. Updated 2026-05-29T14:28 UTC.