Hourly Weather | Today Thursday, December 4, 2025
Fullerton, California
3 AM
Night
55°
Feels Like 48°
0
Humidity: 38%
Wind: 15 mph
UV Index: 0
4 AM
Night
54°
Feels Like 45°
0
Humidity: 40%
Wind: 16 mph
UV Index: 0
5 AM
Night
52°
Feels Like 43°
0
Humidity: 42%
Wind: 15 mph
UV Index: 0
6 AM
Night
50°
Feels Like 41°
0
Humidity: 45%
Wind: 15 mph
UV Index: 0
7 AM
Sunny Weather
48°
Feels Like 39°
0
Humidity: 50%
Wind: 15 mph
UV Index: 0
8 AM
Sunny Weather
52°
Feels Like 45°
0
Humidity: 41%
Wind: 14 mph
UV Index: 1
9 AM
Sunny Weather
57°
Feels Like 54°
0
Humidity: 35%
Wind: 14 mph
UV Index: 2
10 AM
Sunny Weather
63°
Feels Like 61°
0
Humidity: 30%
Wind: 13 mph
UV Index: 2
11 AM
Sunny Weather
66°
Feels Like 66°
0
Humidity: 26%
Wind: 13 mph
UV Index: 3
12 PM
Sunny Weather
70°
Feels Like 70°
0
Humidity: 23%
Wind: 12 mph
UV Index: 3
1 PM
Sunny Weather
72°
Feels Like 75°
0
Humidity: 21%
Wind: 4 mph
UV Index: 3
2 PM
Sunny Weather
73°
Feels Like 75°
0
Humidity: 20%
Wind: 2 mph
UV Index: 2
3 PM
Sunny Weather
72°
Feels Like 73°
0
Humidity: 23%
Wind: 2 mph
UV Index: 2
4 PM
Sunny Weather
70°
Feels Like 70°
0
Humidity: 26%
Wind: 1 mph
UV Index: 1
5 PM
Night
66°
Feels Like 64°
0
Humidity: 31%
Wind: 1 mph
UV Index: 0
6 PM
Cloudy Night
63°
Feels Like 64°
0
Humidity: 36%
Wind: 1 mph
UV Index: 0
7 PM
Cloudy Night
61°
Feels Like 61°
0
Humidity: 40%
Wind: 4 mph
UV Index: 0
8 PM
Night
57°
Feels Like 55°
0
Humidity: 44%
Wind: 5 mph
UV Index: 0
9 PM
Night
55°
Feels Like 54°
0
Humidity: 47%
Wind: 6 mph
UV Index: 0
10 PM
Night
54°
Feels Like 52°
0
Humidity: 47%
Wind: 6 mph
UV Index: 0
11 PM
Night
54°
Feels Like 52°
0
Humidity: 47%
Wind: 6 mph
UV Index: 0

Hourly Air Quality Forecast - AQI (US EPA)

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

Pollutant Concentrations:

  • PM2.5: 24.84 µg/m³
  • PM10: 35.52 µg/m³
  • O3: 0.040 ppm
  • NO2: 8.7 ppb
  • SO2: 2 ppb
  • CO: 0.25 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 23.73 µg/m³
  • PM10: 34.56 µg/m³
  • O3: 0.038 ppm
  • NO2: 8.8 ppb
  • SO2: 1.9 ppb
  • CO: 0.25 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 21.02 µg/m³
  • PM10: 31.61 µg/m³
  • O3: 0.038 ppm
  • NO2: 8.1 ppb
  • SO2: 1.7 ppb
  • CO: 0.24 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 19 µg/m³
  • PM10: 29.49 µg/m³
  • O3: 0.037 ppm
  • NO2: 7.5 ppb
  • SO2: 1.5 ppb
  • CO: 0.24 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 16.92 µg/m³
  • PM10: 27.43 µg/m³
  • O3: 0.037 ppm
  • NO2: 6.7 ppb
  • SO2: 1.4 ppb
  • CO: 0.23 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 14.47 µg/m³
  • PM10: 25.01 µg/m³
  • O3: 0.038 ppm
  • NO2: 6.4 ppb
  • SO2: 1.2 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.

9 AM
50 AQI
Good air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 12.17 µg/m³
  • PM10: 22.68 µg/m³
  • O3: 0.040 ppm
  • NO2: 5.4 ppb
  • SO2: 1.1 ppb
  • CO: 0.21 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 11 µg/m³
  • PM10: 21.46 µg/m³
  • O3: 0.043 ppm
  • NO2: 4.8 ppb
  • SO2: 1 ppb
  • CO: 0.20 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: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 10.71 µg/m³
  • PM10: 21.05 µg/m³
  • O3: 0.046 ppm
  • NO2: 4.7 ppb
  • SO2: 1.1 ppb
  • CO: 0.19 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: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 11.34 µg/m³
  • PM10: 21.54 µg/m³
  • O3: 0.049 ppm
  • NO2: 4.8 ppb
  • SO2: 1.2 ppb
  • CO: 0.19 ppm

Health Recommendations:

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

1 PM
52 AQI
Moderate air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 12.72 µg/m³
  • PM10: 22.78 µg/m³
  • O3: 0.052 ppm
  • NO2: 4.9 ppb
  • SO2: 1.3 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.

2 PM
56 AQI
Moderate air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 14.95 µg/m³
  • PM10: 24.89 µg/m³
  • O3: 0.054 ppm
  • NO2: 5.5 ppb
  • SO2: 1.5 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.

3 PM
60 AQI
Moderate air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 16.87 µg/m³
  • PM10: 26.78 µg/m³
  • O3: 0.056 ppm
  • NO2: 6.4 ppb
  • SO2: 1.6 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.

4 PM
63 AQI
Moderate air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 17.88 µg/m³
  • PM10: 27.72 µg/m³
  • O3: 0.056 ppm
  • NO2: 7.3 ppb
  • SO2: 1.7 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.

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

Pollutant Concentrations:

  • PM2.5: 17.97 µg/m³
  • PM10: 27.68 µg/m³
  • O3: 0.054 ppm
  • NO2: 7.5 ppb
  • SO2: 1.7 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.

6 PM
62 AQI
Moderate air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 17.72 µg/m³
  • PM10: 27.34 µg/m³
  • O3: 0.053 ppm
  • NO2: 6.3 ppb
  • SO2: 1.6 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.

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

Pollutant Concentrations:

  • PM2.5: 16.8 µg/m³
  • PM10: 26.32 µg/m³
  • O3: 0.052 ppm
  • NO2: 5 ppb
  • SO2: 1.4 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.

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

Pollutant Concentrations:

  • PM2.5: 15.05 µg/m³
  • PM10: 24.25 µg/m³
  • O3: 0.052 ppm
  • NO2: 3.6 ppb
  • SO2: 1.3 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.

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

Pollutant Concentrations:

  • PM2.5: 13.21 µg/m³
  • PM10: 21.7 µg/m³
  • O3: 0.052 ppm
  • NO2: 2.7 ppb
  • SO2: 1.1 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.

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

Pollutant Concentrations:

  • PM2.5: 11.14 µg/m³
  • PM10: 18.51 µg/m³
  • O3: 0.051 ppm
  • NO2: 1.9 ppb
  • SO2: 0.8 ppb
  • CO: 0.16 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 9.2 µg/m³
  • PM10: 15.15 µg/m³
  • O3: 0.051 ppm
  • NO2: 1.3 ppb
  • SO2: 0.6 ppb
  • CO: 0.15 ppm

Health Recommendations:

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