Hourly Weather | Today Monday, September 14, 2026
Ontario, California
1 PM
Cloudy Weather
84°
Feels Like 91°
13
Humidity: 42%
UV Index: 7
Wind: 7 mph
2 PM
Cloudy Weather
88°
Feels Like 91°
0
Humidity: 38%
UV Index: 7
Wind: 8 mph
3 PM
Cloudy Weather
90°
Feels Like 91°
0
Humidity: 36%
UV Index: 5
Wind: 9 mph
4 PM
Cloudy Weather
88°
Feels Like 88°
0
Humidity: 38%
UV Index: 4
Wind: 10 mph
5 PM
Cloudy Weather
86°
Feels Like 84°
0
Humidity: 41%
UV Index: 2
Wind: 10 mph
6 PM
Cloudy Weather
84°
Feels Like 82°
0
Humidity: 45%
UV Index: 1
Wind: 10 mph
7 PM
Cloudy Night
81°
Feels Like 79°
0
Humidity: 50%
UV Index: 0
Wind: 9 mph
8 PM
Cloudy Night
77°
Feels Like 75°
0
Humidity: 55%
UV Index: 0
Wind: 8 mph
9 PM
Cloudy Night
75°
Feels Like 73°
0
Humidity: 60%
UV Index: 0
Wind: 7 mph
10 PM
Cloudy Night
73°
Feels Like 72°
0
Humidity: 66%
UV Index: 0
Wind: 6 mph
11 PM
Cloudy Night
72°
Feels Like 70°
0
Humidity: 70%
UV Index: 0
Wind: 6 mph

Hourly Air Quality Forecast - AQI (US EPA)

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

Pollutant Concentrations:

  • PM2.5: 5.79 µg/m³
  • PM10: 19.34 µg/m³
  • O3: 0.045 ppm
  • NO2: 0.2 ppb
  • SO2: 0.3 ppb
  • CO: 0.16 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 6.29 µg/m³
  • PM10: 20.1 µg/m³
  • O3: 0.046 ppm
  • NO2: 0.2 ppb
  • SO2: 0.3 ppb
  • CO: 0.16 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 6.93 µg/m³
  • PM10: 21.11 µg/m³
  • O3: 0.047 ppm
  • NO2: 0.2 ppb
  • SO2: 0.3 ppb
  • CO: 0.16 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 7.62 µg/m³
  • PM10: 22.24 µg/m³
  • O3: 0.049 ppm
  • NO2: 0.2 ppb
  • SO2: 0.3 ppb
  • CO: 0.16 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 8.3 µg/m³
  • PM10: 23.4 µg/m³
  • O3: 0.051 ppm
  • NO2: 0.2 ppb
  • SO2: 0.3 ppb
  • CO: 0.16 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 8.99 µg/m³
  • PM10: 24.09 µg/m³
  • O3: 0.054 ppm
  • NO2: 0.3 ppb
  • SO2: 0.4 ppb
  • CO: 0.16 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 9.53 µg/m³
  • PM10: 24.93 µg/m³
  • O3: 0.055 ppm
  • NO2: 0.4 ppb
  • SO2: 0.4 ppb
  • CO: 0.16 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: O3
Details

Pollutant Concentrations:

  • PM2.5: 9.82 µg/m³
  • PM10: 25.55 µg/m³
  • O3: 0.056 ppm
  • NO2: 0.4 ppb
  • SO2: 0.4 ppb
  • CO: 0.16 ppm

Health Recommendations:

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

9 PM
54 AQI
Moderate air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 9.86 µg/m³
  • PM10: 25.78 µg/m³
  • O3: 0.055 ppm
  • NO2: 0.3 ppb
  • SO2: 0.4 ppb
  • CO: 0.16 ppm

Health Recommendations:

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

10 PM
51 AQI
Moderate air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 9.81 µg/m³
  • PM10: 25.95 µg/m³
  • O3: 0.054 ppm
  • NO2: 0.3 ppb
  • SO2: 0.4 ppb
  • CO: 0.16 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 9.74 µg/m³
  • PM10: 26.11 µg/m³
  • O3: 0.054 ppm
  • NO2: 0.3 ppb
  • SO2: 0.4 ppb
  • CO: 0.17 ppm

Health Recommendations:

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