Hourly Weather | Today Thursday, May 21, 2026
El Cajon, California
9 AM
Cloudy Weather
72°
Feels Like 72°
0
Humidity: 52%
UV Index: 1
Wind: 5 mph
10 AM
Cloudy Weather
75°
Feels Like 75°
0
Humidity: 45%
UV Index: 2
Wind: 7 mph
11 AM
Cloudy Weather
81°
Feels Like 81°
0
Humidity: 39%
UV Index: 3
Wind: 8 mph
12 PM
Cloudy Weather
81°
Feels Like 84°
0
Humidity: 37%
UV Index: 4
Wind: 9 mph
1 PM
Cloudy Weather
82°
Feels Like 84°
0
Humidity: 36%
UV Index: 5
Wind: 9 mph
2 PM
Cloudy Weather
82°
Feels Like 90°
0
Humidity: 35%
UV Index: 11
Wind: 9 mph
3 PM
Cloudy Weather
82°
Feels Like 88°
0
Humidity: 35%
UV Index: 8
Wind: 9 mph
4 PM
Cloudy Weather
81°
Feels Like 82°
0
Humidity: 36%
UV Index: 5
Wind: 9 mph
5 PM
Cloudy Weather
79°
Feels Like 81°
0
Humidity: 38%
UV Index: 3
Wind: 8 mph
6 PM
Cloudy Weather
77°
Feels Like 77°
0
Humidity: 41%
UV Index: 2
Wind: 8 mph
7 PM
Cloudy Weather
73°
Feels Like 73°
0
Humidity: 48%
UV Index: 1
Wind: 7 mph
8 PM
Cloudy Night
72°
Feels Like 68°
0
Humidity: 58%
UV Index: 0
Wind: 6 mph
9 PM
Cloudy Night
66°
Feels Like 64°
0
Humidity: 71%
UV Index: 0
Wind: 5 mph
10 PM
Cloudy Night
63°
Feels Like 63°
0
Humidity: 80%
UV Index: 0
Wind: 5 mph
11 PM
Cloudy Night
61°
Feels Like 61°
0
Humidity: 84%
UV Index: 0
Wind: 5 mph

Hourly Air Quality Forecast - AQI (US EPA)

9 AM
40 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 8.91 µg/m³
  • PM10: 22.54 µg/m³
  • O3: 0.043 ppm
  • NO2: 0.3 ppb
  • SO2: 0.3 ppb
  • CO: 0.10 ppm

Health Recommendations:

Air quality is considered satisfactory, and air pollution poses little or no risk.

10 AM
40 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 8.64 µg/m³
  • PM10: 22.42 µg/m³
  • O3: 0.043 ppm
  • NO2: 0.3 ppb
  • SO2: 0.3 ppb
  • CO: 0.10 ppm

Health Recommendations:

Air quality is considered satisfactory, and air pollution poses little or no risk.

11 AM
39 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 8.46 µg/m³
  • PM10: 22.53 µg/m³
  • O3: 0.042 ppm
  • NO2: 0.2 ppb
  • SO2: 0.3 ppb
  • CO: 0.09 ppm

Health Recommendations:

Air quality is considered satisfactory, and air pollution poses little or no risk.

12 PM
39 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 8.43 µg/m³
  • PM10: 22.99 µg/m³
  • O3: 0.042 ppm
  • NO2: 0.2 ppb
  • SO2: 0.3 ppb
  • CO: 0.09 ppm

Health Recommendations:

Air quality is considered satisfactory, and air pollution poses little or no risk.

1 PM
39 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 8.59 µg/m³
  • PM10: 23.93 µg/m³
  • O3: 0.042 ppm
  • NO2: 0.2 ppb
  • SO2: 0.3 ppb
  • CO: 0.09 ppm

Health Recommendations:

Air quality is considered satisfactory, and air pollution poses little or no risk.

2 PM
38 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 8.75 µg/m³
  • PM10: 24.8 µg/m³
  • O3: 0.042 ppm
  • NO2: 0.2 ppb
  • SO2: 0.3 ppb
  • CO: 0.09 ppm

Health Recommendations:

Air quality is considered satisfactory, and air pollution poses little or no risk.

3 PM
39 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 8.83 µg/m³
  • PM10: 25.18 µg/m³
  • O3: 0.042 ppm
  • NO2: 0.1 ppb
  • SO2: 0.3 ppb
  • CO: 0.09 ppm

Health Recommendations:

Air quality is considered satisfactory, and air pollution poses little or no risk.

4 PM
39 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 8.85 µg/m³
  • PM10: 25.37 µg/m³
  • O3: 0.042 ppm
  • NO2: 0.1 ppb
  • SO2: 0.2 ppb
  • CO: 0.09 ppm

Health Recommendations:

Air quality is considered satisfactory, and air pollution poses little or no risk.

5 PM
40 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 8.87 µg/m³
  • PM10: 25.71 µg/m³
  • O3: 0.043 ppm
  • NO2: 0.1 ppb
  • SO2: 0.2 ppb
  • CO: 0.09 ppm

Health Recommendations:

Air quality is considered satisfactory, and air pollution poses little or no risk.

6 PM
40 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 8.9 µg/m³
  • PM10: 26.12 µg/m³
  • O3: 0.044 ppm
  • NO2: 0.2 ppb
  • SO2: 0.2 ppb
  • CO: 0.09 ppm

Health Recommendations:

Air quality is considered satisfactory, and air pollution poses little or no risk.

7 PM
41 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 8.82 µg/m³
  • PM10: 26.26 µg/m³
  • O3: 0.044 ppm
  • NO2: 0.2 ppb
  • SO2: 0.3 ppb
  • CO: 0.09 ppm

Health Recommendations:

Air quality is considered satisfactory, and air pollution poses little or no risk.

8 PM
41 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 8.66 µg/m³
  • PM10: 25.83 µg/m³
  • O3: 0.045 ppm
  • NO2: 0.2 ppb
  • SO2: 0.3 ppb
  • CO: 0.09 ppm

Health Recommendations:

Air quality is considered satisfactory, and air pollution poses little or no risk.

9 PM
42 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 8.44 µg/m³
  • PM10: 24.96 µg/m³
  • O3: 0.045 ppm
  • NO2: 0.3 ppb
  • SO2: 0.2 ppb
  • CO: 0.10 ppm

Health Recommendations:

Air quality is considered satisfactory, and air pollution poses little or no risk.

10 PM
42 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 8.2 µg/m³
  • PM10: 23.96 µg/m³
  • O3: 0.046 ppm
  • NO2: 0.3 ppb
  • SO2: 0.2 ppb
  • CO: 0.10 ppm

Health Recommendations:

Air quality is considered satisfactory, and air pollution poses little or no risk.

11 PM
43 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 7.93 µg/m³
  • PM10: 22.97 µg/m³
  • O3: 0.046 ppm
  • NO2: 0.2 ppb
  • SO2: 0.2 ppb
  • CO: 0.10 ppm

Health Recommendations:

Air quality is considered satisfactory, and air pollution poses little or no risk.