Hourly Weather | Today Saturday, September 19, 2026
Fontana, California
3 AM
Night
63°
Feels Like 63°
0
Humidity: 84%
UV Index: 0
Wind: 4 mph
4 AM
Night
61°
Feels Like 63°
0
Humidity: 84%
UV Index: 0
Wind: 4 mph
5 AM
Cloudy Night
61°
Feels Like 61°
0
Humidity: 84%
UV Index: 0
Wind: 4 mph
6 AM
Cloudy Night
61°
Feels Like 61°
0
Humidity: 85%
UV Index: 0
Wind: 4 mph
7 AM
Cloudy Weather
61°
Feels Like 61°
0
Humidity: 87%
UV Index: 0
Wind: 4 mph
8 AM
Cloudy Weather
63°
Feels Like 64°
0
Humidity: 85%
UV Index: 1
Wind: 4 mph
9 AM
Cloudy Weather
66°
Feels Like 70°
0
Humidity: 70%
UV Index: 2
Wind: 4 mph
10 AM
Cloudy Weather
72°
Feels Like 75°
0
Humidity: 60%
UV Index: 3
Wind: 4 mph
11 AM
Sunny Weather
75°
Feels Like 81°
0
Humidity: 51%
UV Index: 5
Wind: 5 mph
12 PM
Sunny Weather
79°
Feels Like 86°
0
Humidity: 43%
UV Index: 6
Wind: 5 mph
1 PM
Sunny Weather
82°
Feels Like 90°
0
Humidity: 36%
UV Index: 7
Wind: 6 mph
2 PM
Sunny Weather
86°
Feels Like 91°
0
Humidity: 32%
UV Index: 6
Wind: 7 mph
3 PM
Sunny Weather
88°
Feels Like 90°
0
Humidity: 30%
UV Index: 5
Wind: 8 mph
4 PM
Sunny Weather
90°
Feels Like 90°
0
Humidity: 30%
UV Index: 3
Wind: 8 mph
5 PM
Sunny Weather
86°
Feels Like 86°
0
Humidity: 33%
UV Index: 2
Wind: 9 mph
6 PM
Sunny Weather
82°
Feels Like 82°
0
Humidity: 38%
UV Index: 1
Wind: 8 mph
7 PM
Night
81°
Feels Like 77°
0
Humidity: 45%
UV Index: 0
Wind: 8 mph
8 PM
Night
77°
Feels Like 73°
0
Humidity: 52%
UV Index: 0
Wind: 7 mph
9 PM
Night
73°
Feels Like 72°
0
Humidity: 58%
UV Index: 0
Wind: 6 mph
10 PM
Night
72°
Feels Like 70°
0
Humidity: 64%
UV Index: 0
Wind: 5 mph
11 PM
Night
70°
Feels Like 68°
0
Humidity: 67%
UV Index: 0
Wind: 4 mph

Hourly Air Quality Forecast - AQI (US EPA)

3 AM
44 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 8.29 µg/m³
  • PM10: 23.45 µg/m³
  • O3: 0.047 ppm
  • NO2: 0.3 ppb
  • SO2: 0.3 ppb
  • CO: 0.13 ppm

Health Recommendations:

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

4 AM
43 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 8.21 µg/m³
  • PM10: 23.26 µg/m³
  • O3: 0.047 ppm
  • NO2: 0.2 ppb
  • SO2: 0.3 ppb
  • CO: 0.13 ppm

Health Recommendations:

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

5 AM
43 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 8.09 µg/m³
  • PM10: 22.99 µg/m³
  • O3: 0.047 ppm
  • NO2: 0.2 ppb
  • SO2: 0.3 ppb
  • CO: 0.13 ppm

Health Recommendations:

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

6 AM
43 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 7.98 µg/m³
  • PM10: 22.67 µg/m³
  • O3: 0.047 ppm
  • NO2: 0.2 ppb
  • SO2: 0.3 ppb
  • CO: 0.13 ppm

Health Recommendations:

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

7 AM
43 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 7.88 µg/m³
  • PM10: 22.33 µg/m³
  • O3: 0.047 ppm
  • NO2: 0.2 ppb
  • SO2: 0.3 ppb
  • CO: 0.13 ppm

Health Recommendations:

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

8 AM
43 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 7.83 µg/m³
  • PM10: 22.08 µg/m³
  • O3: 0.047 ppm
  • NO2: 0.3 ppb
  • SO2: 0.3 ppb
  • CO: 0.13 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 7.89 µg/m³
  • PM10: 21.99 µg/m³
  • O3: 0.046 ppm
  • NO2: 0.3 ppb
  • SO2: 0.3 ppb
  • CO: 0.13 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 8.07 µg/m³
  • PM10: 22.14 µg/m³
  • O3: 0.046 ppm
  • NO2: 0.3 ppb
  • SO2: 0.3 ppb
  • CO: 0.13 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 8.34 µg/m³
  • PM10: 22.37 µg/m³
  • O3: 0.046 ppm
  • NO2: 0.3 ppb
  • SO2: 0.3 ppb
  • CO: 0.13 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 8.71 µg/m³
  • PM10: 22.77 µg/m³
  • O3: 0.048 ppm
  • NO2: 0.2 ppb
  • SO2: 0.3 ppb
  • CO: 0.13 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 9.15 µg/m³
  • PM10: 23.26 µg/m³
  • O3: 0.049 ppm
  • NO2: 0.2 ppb
  • SO2: 0.3 ppb
  • CO: 0.13 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 9.68 µg/m³
  • PM10: 23.91 µg/m³
  • O3: 0.050 ppm
  • NO2: 0.2 ppb
  • SO2: 0.3 ppb
  • CO: 0.13 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 10.34 µg/m³
  • PM10: 24.91 µg/m³
  • O3: 0.051 ppm
  • NO2: 0.2 ppb
  • SO2: 0.3 ppb
  • CO: 0.13 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 11.06 µg/m³
  • PM10: 26.15 µg/m³
  • O3: 0.052 ppm
  • NO2: 0.2 ppb
  • SO2: 0.3 ppb
  • CO: 0.14 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 11.66 µg/m³
  • PM10: 27.22 µg/m³
  • O3: 0.054 ppm
  • NO2: 0.3 ppb
  • SO2: 0.3 ppb
  • CO: 0.14 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 11.93 µg/m³
  • PM10: 27.6 µg/m³
  • O3: 0.057 ppm
  • NO2: 0.4 ppb
  • SO2: 0.4 ppb
  • CO: 0.14 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 11.75 µg/m³
  • PM10: 27.68 µg/m³
  • O3: 0.056 ppm
  • NO2: 0.5 ppb
  • SO2: 0.4 ppb
  • CO: 0.14 ppm

Health Recommendations:

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

8 PM
52 AQI
Moderate air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 11.14 µg/m³
  • PM10: 27.61 µg/m³
  • O3: 0.055 ppm
  • NO2: 0.5 ppb
  • SO2: 0.4 ppb
  • CO: 0.14 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 10.37 µg/m³
  • PM10: 27.59 µg/m³
  • O3: 0.053 ppm
  • NO2: 0.5 ppb
  • SO2: 0.4 ppb
  • CO: 0.13 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 9.67 µg/m³
  • PM10: 27.67 µg/m³
  • O3: 0.051 ppm
  • NO2: 0.5 ppb
  • SO2: 0.4 ppb
  • CO: 0.13 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 9.05 µg/m³
  • PM10: 27.84 µg/m³
  • O3: 0.050 ppm
  • NO2: 0.4 ppb
  • SO2: 0.4 ppb
  • CO: 0.13 ppm

Health Recommendations:

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