Hourly Weather | Today Tuesday, July 21, 2026
Joliet, Illinois
4 AM
Stormy Weather
73°
Feels Like 79°
58
Humidity: 96%
UV Index: 0
Wind: 8 mph
5 AM
Stormy Weather
73°
Feels Like 77°
61
Humidity: 97%
UV Index: 0
Wind: 7 mph
6 AM
Cloudy Weather
73°
Feels Like 79°
49
Humidity: 99%
UV Index: 0
Wind: 6 mph
7 AM
Cloudy Weather
72°
Feels Like 79°
36
Humidity: 100%
UV Index: 1
Wind: 6 mph
8 AM
Cloudy Weather
75°
Feels Like 81°
20
Humidity: 90%
UV Index: 2
Wind: 8 mph
9 AM
Cloudy Weather
79°
Feels Like 84°
20
Humidity: 82%
UV Index: 3
Wind: 9 mph
10 AM
Cloudy Weather
81°
Feels Like 90°
20
Humidity: 73%
UV Index: 5
Wind: 9 mph
11 AM
Cloudy Weather
82°
Feels Like 91°
20
Humidity: 68%
UV Index: 7
Wind: 10 mph
12 PM
Cloudy Weather
82°
Feels Like 91°
20
Humidity: 63%
UV Index: 9
Wind: 12 mph
1 PM
Cloudy Weather
84°
Feels Like 90°
19
Humidity: 59%
UV Index: 5
Wind: 13 mph
2 PM
Cloudy Weather
84°
Feels Like 88°
17
Humidity: 59%
UV Index: 5
Wind: 13 mph
3 PM
Cloudy Weather
82°
Feels Like 86°
17
Humidity: 59%
UV Index: 4
Wind: 12 mph
4 PM
Cloudy Weather
82°
Feels Like 84°
22
Humidity: 61%
UV Index: 3
Wind: 12 mph
5 PM
Partly Sunny with Showers
81°
Feels Like 81°
42
Humidity: 61%
UV Index: 2
Wind: 12 mph
6 PM
Cloudy Weather
81°
Feels Like 81°
38
Humidity: 62%
UV Index: 2
Wind: 12 mph
7 PM
Cloudy Weather
79°
Feels Like 79°
30
Humidity: 64%
UV Index: 1
Wind: 10 mph
8 PM
Cloudy Weather
77°
Feels Like 75°
20
Humidity: 66%
UV Index: 0
Wind: 10 mph
9 PM
Cloudy Night
73°
Feels Like 73°
20
Humidity: 74%
UV Index: 0
Wind: 9 mph
10 PM
Cloudy Night
72°
Feels Like 72°
20
Humidity: 78%
UV Index: 0
Wind: 8 mph
11 PM
Cloudy Night
72°
Feels Like 70°
20
Humidity: 78%
UV Index: 0
Wind: 8 mph

Hourly Air Quality Forecast - AQI (US EPA)

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

Pollutant Concentrations:

  • PM2.5: 14.66 µg/m³
  • PM10: 14.9 µg/m³
  • O3: 0.031 ppm
  • NO2: 1.6 ppb
  • SO2: 1.1 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.

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

Pollutant Concentrations:

  • PM2.5: 11.7 µg/m³
  • PM10: 11.86 µg/m³
  • O3: 0.027 ppm
  • NO2: 1.5 ppb
  • SO2: 0.7 ppb
  • CO: 0.13 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 9.12 µg/m³
  • PM10: 9.22 µg/m³
  • O3: 0.024 ppm
  • NO2: 1.5 ppb
  • SO2: 0.5 ppb
  • CO: 0.12 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 7.24 µg/m³
  • PM10: 7.33 µg/m³
  • O3: 0.021 ppm
  • NO2: 1.6 ppb
  • SO2: 0.4 ppb
  • CO: 0.11 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 5.94 µg/m³
  • PM10: 6.02 µg/m³
  • O3: 0.018 ppm
  • NO2: 1.8 ppb
  • SO2: 0.4 ppb
  • CO: 0.11 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 5.24 µg/m³
  • PM10: 5.33 µg/m³
  • O3: 0.017 ppm
  • NO2: 1.7 ppb
  • SO2: 0.4 ppb
  • CO: 0.11 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 5.2 µg/m³
  • PM10: 5.3 µg/m³
  • O3: 0.019 ppm
  • NO2: 1.5 ppb
  • SO2: 0.5 ppb
  • CO: 0.11 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 5.79 µg/m³
  • PM10: 5.9 µg/m³
  • O3: 0.028 ppm
  • NO2: 1 ppb
  • SO2: 0.5 ppb
  • CO: 0.10 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 6.09 µg/m³
  • PM10: 6.22 µg/m³
  • O3: 0.033 ppm
  • NO2: 0.7 ppb
  • SO2: 0.5 ppb
  • CO: 0.10 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 6.27 µg/m³
  • PM10: 6.41 µg/m³
  • O3: 0.035 ppm
  • NO2: 0.6 ppb
  • SO2: 0.5 ppb
  • CO: 0.10 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 5.94 µg/m³
  • PM10: 6.07 µg/m³
  • O3: 0.039 ppm
  • NO2: 0.5 ppb
  • SO2: 0.5 ppb
  • CO: 0.10 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 5.48 µg/m³
  • PM10: 5.6 µg/m³
  • O3: 0.040 ppm
  • NO2: 0.5 ppb
  • SO2: 0.5 ppb
  • CO: 0.10 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 5.17 µg/m³
  • PM10: 5.28 µg/m³
  • O3: 0.040 ppm
  • NO2: 0.5 ppb
  • SO2: 0.5 ppb
  • CO: 0.11 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 4.79 µg/m³
  • PM10: 4.89 µg/m³
  • O3: 0.038 ppm
  • NO2: 0.6 ppb
  • SO2: 0.5 ppb
  • CO: 0.11 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 4.47 µg/m³
  • PM10: 4.57 µg/m³
  • O3: 0.037 ppm
  • NO2: 0.9 ppb
  • SO2: 0.5 ppb
  • CO: 0.12 ppm

Health Recommendations:

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

7 PM
32 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 4.09 µg/m³
  • PM10: 4.2 µg/m³
  • O3: 0.035 ppm
  • NO2: 1.1 ppb
  • SO2: 0.5 ppb
  • CO: 0.12 ppm

Health Recommendations:

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

8 PM
30 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 3.62 µg/m³
  • PM10: 3.73 µg/m³
  • O3: 0.032 ppm
  • NO2: 1.5 ppb
  • SO2: 0.5 ppb
  • CO: 0.12 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 3.22 µg/m³
  • PM10: 3.33 µg/m³
  • O3: 0.029 ppm
  • NO2: 1.8 ppb
  • SO2: 0.5 ppb
  • CO: 0.12 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 2.84 µg/m³
  • PM10: 2.96 µg/m³
  • O3: 0.027 ppm
  • NO2: 1.9 ppb
  • SO2: 0.5 ppb
  • CO: 0.12 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 2.47 µg/m³
  • PM10: 2.58 µg/m³
  • O3: 0.025 ppm
  • NO2: 1.9 ppb
  • SO2: 0.5 ppb
  • CO: 0.12 ppm

Health Recommendations:

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