Air Quality in El Cajon, United States
Clear
28.7°C · 41.6% humidity
28.7°
Feels 30.1°
60
Moderate
Unusually sensitive people should consider reducing prolonged outdoor exertion.
Model forecast
Nearby Monitoring Stations
El Cajon's air quality — share it
AQI Forecast
54
1pm
54
54
60
4pm
58
57
56
7pm
56
55
55
10pm
55
54
54
1am
54
54
54
4am
54
54
34
7am
54
54
54
10am
54
54
Air Quality Index Trend
46h · 8 stnEl Cajon's air quality is primarily affected by vehicle emissions and industrial activity. Seasonal wildfire smoke and weather patterns can cause periodic air quality deterioration. Current PM2.5 concentration in El Cajon is 1.1× the WHO 24-hour guideline of 15 µg/m³.
41.6%
Humidity
35.6 km/h
Wind WSW
1010.0 hPa
Pressure
17.4
UV Extreme
GoodModerateUSGUnhealthyVery UnhealthyHazardous
Which pollutant is driving the AQI?
PM2.5▲
16.35 µg/m³
PM10
41.15 µg/m³
050100150200300500
What is the weather forecast for El Cajon?
Temperature & Precipitation
PM2.5 Trend
46h · 8 stationsPM2.516.35 µg/m³
×1.1 WHO
Moderate
PM1041.15 µg/m³
Good
UV INDEX17.4
Extreme
What is the 7-day forecast for El Cajon?
08-03
31.0° 21.8°
08-04
32.0° 24.3°
0.31 mm
08-05
32.9° 23.0°
0.75 mm
08-06
31.4° 20.4°
08-07
28.1° 23.6°
08-08
30.2° 21.5°
08-09
27.9° 19.8°
Both models agree
Avg diff: 2.5°C
Where are air quality stations near El Cajon?
64
Alpine-Victoria Drive, San Diego, California
41
San Diego - Sherman Elementary School, San Diego, California
42
San Diego - Sherman Elementary School, San Diego, California
42
Otay Mesa - Donovan Correctional Facility, San Diego, California
46
Otay Mesa - Donovan Correctional Facility, San Diego, California
43
Ocean View Hills
What cities are near El Cajon?
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Data sources: Weather forecast from ECMWF (IFS & CAMS models). AQI calculated using US EPA standard. Updated 2026-08-07T23:58 UTC.