Hourly Weather | Today Thursday, December 4, 2025
Santa Ana, California
3 AM
Night
54°
Feels Like 45°
0
Humidity: 36%
Wind: 21 mph
UV Index: 0
4 AM
Night
52°
Feels Like 43°
0
Humidity: 42%
Wind: 22 mph
UV Index: 0
5 AM
Night
52°
Feels Like 41°
0
Humidity: 45%
Wind: 18 mph
UV Index: 0
6 AM
Night
48°
Feels Like 39°
0
Humidity: 48%
Wind: 14 mph
UV Index: 0
7 AM
Cloudy Weather
52°
Feels Like 43°
0
Humidity: 47%
Wind: 15 mph
UV Index: 0
8 AM
Cloudy Weather
55°
Feels Like 48°
0
Humidity: 39%
Wind: 15 mph
UV Index: 1
9 AM
Cloudy Weather
59°
Feels Like 55°
0
Humidity: 35%
Wind: 14 mph
UV Index: 2
10 AM
Cloudy Weather
64°
Feels Like 63°
0
Humidity: 30%
Wind: 13 mph
UV Index: 2
11 AM
Sunny Weather
68°
Feels Like 66°
0
Humidity: 27%
Wind: 13 mph
UV Index: 3
12 PM
Sunny Weather
70°
Feels Like 70°
0
Humidity: 23%
Wind: 13 mph
UV Index: 3
1 PM
Sunny Weather
72°
Feels Like 75°
0
Humidity: 22%
Wind: 5 mph
UV Index: 3
2 PM
Sunny Weather
73°
Feels Like 75°
0
Humidity: 21%
Wind: 2 mph
UV Index: 2
3 PM
Sunny Weather
72°
Feels Like 73°
0
Humidity: 24%
Wind: 1 mph
UV Index: 2
4 PM
Sunny Weather
70°
Feels Like 70°
0
Humidity: 28%
Wind: 0 mph
UV Index: 1
5 PM
Cloudy Night
64°
Feels Like 64°
0
Humidity: 34%
Wind: 0 mph
UV Index: 0
6 PM
Cloudy Night
63°
Feels Like 63°
0
Humidity: 40%
Wind: 1 mph
UV Index: 0
7 PM
Cloudy Night
59°
Feels Like 61°
0
Humidity: 44%
Wind: 4 mph
UV Index: 0
8 PM
Night
55°
Feels Like 55°
0
Humidity: 48%
Wind: 5 mph
UV Index: 0
9 PM
Night
54°
Feels Like 54°
0
Humidity: 51%
Wind: 6 mph
UV Index: 0
10 PM
Night
54°
Feels Like 52°
0
Humidity: 51%
Wind: 6 mph
UV Index: 0
11 PM
Night
52°
Feels Like 52°
0
Humidity: 51%
Wind: 6 mph
UV Index: 0

Hourly Air Quality Forecast - AQI (US EPA)

3 AM
74 AQI
Moderate air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 23.45 µg/m³
  • PM10: 33.18 µg/m³
  • O3: 0.046 ppm
  • NO2: 4.7 ppb
  • SO2: 1.4 ppb
  • CO: 0.21 ppm

Health Recommendations:

Air quality is acceptable; some pollutants may pose a risk for a small number of unusually sensitive people.

4 AM
74 AQI
Moderate air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 23.09 µg/m³
  • PM10: 33.05 µg/m³
  • O3: 0.045 ppm
  • NO2: 4.8 ppb
  • SO2: 1.4 ppb
  • CO: 0.22 ppm

Health Recommendations:

Air quality is acceptable; some pollutants may pose a risk for a small number of unusually sensitive people.

5 AM
70 AQI
Moderate air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 21.58 µg/m³
  • PM10: 31.63 µg/m³
  • O3: 0.043 ppm
  • NO2: 4.6 ppb
  • SO2: 1.4 ppb
  • CO: 0.22 ppm

Health Recommendations:

Air quality is acceptable; some pollutants may pose a risk for a small number of unusually sensitive people.

6 AM
67 AQI
Moderate air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 20.03 µg/m³
  • PM10: 30.28 µg/m³
  • O3: 0.042 ppm
  • NO2: 4.3 ppb
  • SO2: 1.3 ppb
  • CO: 0.22 ppm

Health Recommendations:

Air quality is acceptable; some pollutants may pose a risk for a small number of unusually sensitive people.

7 AM
63 AQI
Moderate air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 17.98 µg/m³
  • PM10: 28.56 µg/m³
  • O3: 0.041 ppm
  • NO2: 4 ppb
  • SO2: 1.2 ppb
  • CO: 0.21 ppm

Health Recommendations:

Air quality is acceptable; some pollutants may pose a risk for a small number of unusually sensitive people.

8 AM
57 AQI
Moderate air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 15.23 µg/m³
  • PM10: 26.17 µg/m³
  • O3: 0.041 ppm
  • NO2: 3.9 ppb
  • SO2: 1 ppb
  • CO: 0.20 ppm

Health Recommendations:

Air quality is acceptable; some pollutants may pose a risk for a small number of unusually sensitive people.

9 AM
51 AQI
Moderate air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 12.61 µg/m³
  • PM10: 23.72 µg/m³
  • O3: 0.043 ppm
  • NO2: 3.3 ppb
  • SO2: 0.9 ppb
  • CO: 0.19 ppm

Health Recommendations:

Air quality is acceptable; some pollutants may pose a risk for a small number of unusually sensitive people.

10 AM
46 AQI
Good air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 10.98 µg/m³
  • PM10: 22.05 µg/m³
  • O3: 0.046 ppm
  • NO2: 2.9 ppb
  • SO2: 0.8 ppb
  • CO: 0.18 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 10.14 µg/m³
  • PM10: 20.95 µg/m³
  • O3: 0.048 ppm
  • NO2: 2.8 ppb
  • SO2: 0.8 ppb
  • CO: 0.17 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 10.08 µg/m³
  • PM10: 20.54 µg/m³
  • O3: 0.051 ppm
  • NO2: 2.8 ppb
  • SO2: 0.8 ppb
  • CO: 0.17 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 10.47 µg/m³
  • PM10: 20.58 µg/m³
  • O3: 0.053 ppm
  • NO2: 2.9 ppb
  • SO2: 0.9 ppb
  • CO: 0.17 ppm

Health Recommendations:

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

2 PM
53 AQI
Moderate air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 11.42 µg/m³
  • PM10: 21.28 µg/m³
  • O3: 0.055 ppm
  • NO2: 3.1 ppb
  • SO2: 1 ppb
  • CO: 0.17 ppm

Health Recommendations:

Air quality is acceptable; some pollutants may pose a risk for a small number of unusually sensitive people.

3 PM
57 AQI
Moderate air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 12.36 µg/m³
  • PM10: 22.09 µg/m³
  • O3: 0.056 ppm
  • NO2: 3.5 ppb
  • SO2: 1 ppb
  • CO: 0.17 ppm

Health Recommendations:

Air quality is acceptable; some pollutants may pose a risk for a small number of unusually sensitive people.

4 PM
58 AQI
Moderate air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 12.93 µg/m³
  • PM10: 22.55 µg/m³
  • O3: 0.056 ppm
  • NO2: 4 ppb
  • SO2: 1 ppb
  • CO: 0.17 ppm

Health Recommendations:

Air quality is acceptable; some pollutants may pose a risk for a small number of unusually sensitive people.

5 PM
56 AQI
Moderate air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 13.25 µg/m³
  • PM10: 22.75 µg/m³
  • O3: 0.056 ppm
  • NO2: 4.2 ppb
  • SO2: 1 ppb
  • CO: 0.17 ppm

Health Recommendations:

Air quality is acceptable; some pollutants may pose a risk for a small number of unusually sensitive people.

6 PM
55 AQI
Moderate air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 13.75 µg/m³
  • PM10: 23.27 µg/m³
  • O3: 0.056 ppm
  • NO2: 3.6 ppb
  • SO2: 1 ppb
  • CO: 0.17 ppm

Health Recommendations:

Air quality is acceptable; some pollutants may pose a risk for a small number of unusually sensitive people.

7 PM
55 AQI
Moderate air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 14.26 µg/m³
  • PM10: 23.91 µg/m³
  • O3: 0.055 ppm
  • NO2: 3 ppb
  • SO2: 1 ppb
  • CO: 0.18 ppm

Health Recommendations:

Air quality is acceptable; some pollutants may pose a risk for a small number of unusually sensitive people.

8 PM
55 AQI
Moderate air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 14.42 µg/m³
  • PM10: 24.14 µg/m³
  • O3: 0.055 ppm
  • NO2: 2.4 ppb
  • SO2: 1 ppb
  • CO: 0.18 ppm

Health Recommendations:

Air quality is acceptable; some pollutants may pose a risk for a small number of unusually sensitive people.

9 PM
55 AQI
Moderate air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 14.26 µg/m³
  • PM10: 23.8 µg/m³
  • O3: 0.054 ppm
  • NO2: 2 ppb
  • SO2: 0.9 ppb
  • CO: 0.18 ppm

Health Recommendations:

Air quality is acceptable; some pollutants may pose a risk for a small number of unusually sensitive people.

10 PM
53 AQI
Moderate air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 13.19 µg/m³
  • PM10: 22.07 µg/m³
  • O3: 0.053 ppm
  • NO2: 1.7 ppb
  • SO2: 0.8 ppb
  • CO: 0.17 ppm

Health Recommendations:

Air quality is acceptable; some pollutants may pose a risk for a small number of unusually sensitive people.

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

Pollutant Concentrations:

  • PM2.5: 11.16 µg/m³
  • PM10: 18.76 µg/m³
  • O3: 0.053 ppm
  • NO2: 1.2 ppb
  • SO2: 0.7 ppb
  • CO: 0.16 ppm

Health Recommendations:

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