Hourly Weather | Today Thursday, December 4, 2025
Fontana, California
3 AM
Cloudy Night
52°
Feels Like 43°
0
Humidity: 38%
Wind: 16 mph
UV Index: 0
4 AM
Cloudy Night
50°
Feels Like 41°
0
Humidity: 40%
Wind: 16 mph
UV Index: 0
5 AM
Cloudy Night
48°
Feels Like 39°
0
Humidity: 41%
Wind: 15 mph
UV Index: 0
6 AM
Cloudy Night
48°
Feels Like 39°
0
Humidity: 43%
Wind: 14 mph
UV Index: 0
7 AM
Cloudy Weather
46°
Feels Like 37°
0
Humidity: 42%
Wind: 15 mph
UV Index: 0
8 AM
Cloudy Weather
50°
Feels Like 43°
0
Humidity: 40%
Wind: 15 mph
UV Index: 1
9 AM
Cloudy Weather
55°
Feels Like 50°
0
Humidity: 33%
Wind: 14 mph
UV Index: 2
10 AM
Cloudy Weather
61°
Feels Like 57°
0
Humidity: 27%
Wind: 14 mph
UV Index: 2
11 AM
Cloudy Weather
63°
Feels Like 63°
0
Humidity: 23%
Wind: 13 mph
UV Index: 3
12 PM
Cloudy Weather
66°
Feels Like 66°
0
Humidity: 20%
Wind: 12 mph
UV Index: 3
1 PM
Cloudy Weather
68°
Feels Like 70°
0
Humidity: 18%
Wind: 8 mph
UV Index: 3
2 PM
Cloudy Weather
70°
Feels Like 72°
0
Humidity: 17%
Wind: 7 mph
UV Index: 2
3 PM
Cloudy Weather
68°
Feels Like 68°
0
Humidity: 18%
Wind: 6 mph
UV Index: 2
4 PM
Cloudy Weather
66°
Feels Like 66°
0
Humidity: 20%
Wind: 4 mph
UV Index: 1
5 PM
Cloudy Night
63°
Feels Like 63°
0
Humidity: 23%
Wind: 4 mph
UV Index: 0
6 PM
Cloudy Night
61°
Feels Like 61°
0
Humidity: 26%
Wind: 4 mph
UV Index: 0
7 PM
Cloudy Night
57°
Feels Like 55°
0
Humidity: 29%
Wind: 6 mph
UV Index: 0
8 PM
Cloudy Night
55°
Feels Like 52°
0
Humidity: 31%
Wind: 8 mph
UV Index: 0
9 PM
Night
54°
Feels Like 48°
0
Humidity: 34%
Wind: 8 mph
UV Index: 0
10 PM
Night
52°
Feels Like 46°
0
Humidity: 36%
Wind: 8 mph
UV Index: 0
11 PM
Night
52°
Feels Like 46°
0
Humidity: 36%
Wind: 8 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: 23.13 µg/m³
  • PM10: 34.55 µg/m³
  • O3: 0.037 ppm
  • NO2: 8.3 ppb
  • SO2: 1.8 ppb
  • CO: 0.26 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 20.39 µg/m³
  • PM10: 31.62 µg/m³
  • O3: 0.039 ppm
  • NO2: 6 ppb
  • SO2: 1.4 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.

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

Pollutant Concentrations:

  • PM2.5: 13.41 µg/m³
  • PM10: 23.22 µg/m³
  • O3: 0.043 ppm
  • NO2: 3.4 ppb
  • SO2: 0.9 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.

6 AM
48 AQI
Good air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 11.6 µg/m³
  • PM10: 21.05 µg/m³
  • O3: 0.043 ppm
  • NO2: 2.8 ppb
  • SO2: 0.7 ppb
  • CO: 0.19 ppm

Health Recommendations:

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

7 AM
44 AQI
Good air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 10.52 µg/m³
  • PM10: 19.88 µg/m³
  • O3: 0.042 ppm
  • NO2: 2.4 ppb
  • SO2: 0.7 ppb
  • CO: 0.19 ppm

Health Recommendations:

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

8 AM
39 AQI
Good air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 9.3 µg/m³
  • PM10: 18.69 µg/m³
  • O3: 0.042 ppm
  • NO2: 3 ppb
  • SO2: 0.7 ppb
  • CO: 0.18 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 8.07 µg/m³
  • PM10: 17.45 µg/m³
  • O3: 0.042 ppm
  • NO2: 3 ppb
  • SO2: 0.7 ppb
  • CO: 0.18 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: 7.52 µg/m³
  • PM10: 16.82 µg/m³
  • O3: 0.043 ppm
  • NO2: 3.1 ppb
  • SO2: 0.8 ppb
  • CO: 0.17 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 7.64 µg/m³
  • PM10: 16.8 µg/m³
  • O3: 0.046 ppm
  • NO2: 3.3 ppb
  • SO2: 0.9 ppb
  • CO: 0.17 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 8.66 µg/m³
  • PM10: 17.75 µg/m³
  • O3: 0.049 ppm
  • NO2: 3.4 ppb
  • SO2: 1.1 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: 10.5 µg/m³
  • PM10: 19.52 µg/m³
  • O3: 0.053 ppm
  • NO2: 3.4 ppb
  • SO2: 1.3 ppb
  • CO: 0.17 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 13.64 µg/m³
  • PM10: 22.52 µg/m³
  • O3: 0.056 ppm
  • NO2: 4.6 ppb
  • SO2: 1.7 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.

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

Pollutant Concentrations:

  • PM2.5: 17.49 µg/m³
  • PM10: 26.38 µg/m³
  • O3: 0.057 ppm
  • NO2: 6.8 ppb
  • SO2: 2.1 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 PM
69 AQI
Moderate air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 20.94 µg/m³
  • PM10: 29.96 µg/m³
  • O3: 0.055 ppm
  • NO2: 9.3 ppb
  • SO2: 2.5 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.

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

Pollutant Concentrations:

  • PM2.5: 22.88 µg/m³
  • PM10: 32.09 µg/m³
  • O3: 0.052 ppm
  • NO2: 11.5 ppb
  • SO2: 2.7 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.

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

Pollutant Concentrations:

  • PM2.5: 22.85 µg/m³
  • PM10: 32.2 µg/m³
  • O3: 0.049 ppm
  • NO2: 10.8 ppb
  • SO2: 2.6 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.

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

Pollutant Concentrations:

  • PM2.5: 20.54 µg/m³
  • PM10: 29.77 µg/m³
  • O3: 0.048 ppm
  • NO2: 8.7 ppb
  • SO2: 2.3 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.

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

Pollutant Concentrations:

  • PM2.5: 16.57 µg/m³
  • PM10: 25.25 µg/m³
  • O3: 0.049 ppm
  • NO2: 6.1 ppb
  • SO2: 1.9 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.

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

Pollutant Concentrations:

  • PM2.5: 13.62 µg/m³
  • PM10: 21.5 µg/m³
  • O3: 0.048 ppm
  • NO2: 4.6 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.

10 PM
44 AQI
Good air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 10.6 µg/m³
  • PM10: 17.28 µg/m³
  • O3: 0.047 ppm
  • NO2: 3.5 ppb
  • SO2: 1.2 ppb
  • CO: 0.18 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: 8.06 µg/m³
  • PM10: 13.38 µg/m³
  • O3: 0.046 ppm
  • NO2: 2.5 ppb
  • SO2: 0.9 ppb
  • CO: 0.16 ppm

Health Recommendations:

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