Hourly Weather | Today Thursday, May 21, 2026
Chula Vista, California
9 AM
Cloudy Weather
68°
Feels Like 68°
37
Humidity: 77%
UV Index: 1
Wind: 6 mph
10 AM
Cloudy Weather
72°
Feels Like 72°
33
Humidity: 68%
UV Index: 2
Wind: 8 mph
11 AM
Cloudy Weather
72°
Feels Like 73°
32
Humidity: 63%
UV Index: 3
Wind: 9 mph
12 PM
Cloudy Weather
72°
Feels Like 73°
32
Humidity: 60%
UV Index: 4
Wind: 9 mph
1 PM
Cloudy Weather
73°
Feels Like 75°
21
Humidity: 59%
UV Index: 5
Wind: 10 mph
2 PM
Cloudy Weather
72°
Feels Like 79°
0
Humidity: 60%
UV Index: 10
Wind: 10 mph
3 PM
Cloudy Weather
72°
Feels Like 77°
0
Humidity: 60%
UV Index: 8
Wind: 10 mph
4 PM
Cloudy Weather
72°
Feels Like 73°
0
Humidity: 61%
UV Index: 5
Wind: 9 mph
5 PM
Cloudy Weather
72°
Feels Like 72°
0
Humidity: 62%
UV Index: 3
Wind: 9 mph
6 PM
Cloudy Weather
70°
Feels Like 70°
0
Humidity: 65%
UV Index: 2
Wind: 8 mph
7 PM
Cloudy Weather
68°
Feels Like 66°
0
Humidity: 70%
UV Index: 1
Wind: 7 mph
8 PM
Night
68°
Feels Like 64°
0
Humidity: 73%
UV Index: 0
Wind: 7 mph
9 PM
Night
66°
Feels Like 64°
0
Humidity: 77%
UV Index: 0
Wind: 6 mph
10 PM
Night
64°
Feels Like 63°
0
Humidity: 78%
UV Index: 0
Wind: 5 mph
11 PM
Night
64°
Feels Like 64°
0
Humidity: 80%
UV Index: 0
Wind: 5 mph

Hourly Air Quality Forecast - AQI (US EPA)

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

Pollutant Concentrations:

  • PM2.5: 8.77 µg/m³
  • PM10: 23.39 µg/m³
  • O3: 0.042 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
38 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 8.61 µg/m³
  • PM10: 23.49 µg/m³
  • O3: 0.041 ppm
  • NO2: 0.3 ppb
  • SO2: 0.3 ppb
  • CO: 0.09 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 8.55 µg/m³
  • PM10: 23.78 µg/m³
  • O3: 0.041 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
38 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 8.59 µg/m³
  • PM10: 24.3 µg/m³
  • O3: 0.041 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
38 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 8.74 µg/m³
  • PM10: 25.09 µg/m³
  • O3: 0.041 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: 8.87 µg/m³
  • PM10: 25.82 µg/m³
  • O3: 0.041 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.

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

Pollutant Concentrations:

  • PM2.5: 8.94 µg/m³
  • PM10: 26.17 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.

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

Pollutant Concentrations:

  • PM2.5: 8.95 µg/m³
  • PM10: 26.43 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: 8.95 µg/m³
  • PM10: 26.71 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
41 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 8.9 µg/m³
  • PM10: 26.85 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: 8.76 µg/m³
  • PM10: 26.63 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.

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

Pollutant Concentrations:

  • PM2.5: 8.59 µg/m³
  • PM10: 26.15 µg/m³
  • O3: 0.045 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.

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

Pollutant Concentrations:

  • PM2.5: 8.42 µg/m³
  • PM10: 25.53 µg/m³
  • O3: 0.045 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.

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

Pollutant Concentrations:

  • PM2.5: 8.27 µg/m³
  • PM10: 24.9 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.

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

Pollutant Concentrations:

  • PM2.5: 8.11 µg/m³
  • PM10: 24.32 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.