Hourly Weather | Today Wednesday, March 18, 2026
Joliet, Illinois
8 AM
Cloudy Weather
25°
Feels Like
38
Frost Risk: 84%
Humidity: 91%
UV Index: 0
Wind: 14 mph
9 AM
Snowy Weather
27°
Feels Like 12°
51
Frost Risk: 74%
Humidity: 86%
UV Index: 1
Wind: 15 mph
10 AM
Cloudy Weather
28°
Feels Like 16°
44
Humidity: 81%
UV Index: 1
Wind: 15 mph
11 AM
Cloudy Weather
32°
Feels Like 21°
37
Humidity: 76%
UV Index: 2
Wind: 15 mph
12 PM
Cloudy Weather
36°
Feels Like 27°
44
Humidity: 72%
UV Index: 2
Wind: 15 mph
1 PM
Snowy Weather
37°
Feels Like 28°
51
Humidity: 68%
UV Index: 2
Wind: 15 mph
2 PM
Cloudy Weather
41°
Feels Like 37°
16
Humidity: 66%
UV Index: 3
Wind: 10 mph
3 PM
Cloudy Weather
43°
Feels Like 41°
12
Humidity: 64%
UV Index: 4
Wind: 10 mph
4 PM
Cloudy Weather
45°
Feels Like 43°
12
Humidity: 62%
UV Index: 2
Wind: 9 mph
5 PM
Cloudy Weather
43°
Feels Like 41°
12
Humidity: 66%
UV Index: 2
Wind: 8 mph
6 PM
Cloudy Weather
41°
Feels Like 39°
12
Humidity: 72%
UV Index: 1
Wind: 6 mph
7 PM
Cloudy Weather
39°
Feels Like 37°
8
Humidity: 77%
UV Index: 0
Wind: 6 mph
8 PM
Cloudy Weather
37°
Feels Like 37°
0
Humidity: 81%
UV Index: 0
Wind: 5 mph
9 PM
Cloudy Weather
37°
Feels Like 36°
0
Humidity: 86%
UV Index: 0
Wind: 5 mph
10 PM
Cloudy Weather
36°
Feels Like 34°
0
Humidity: 91%
UV Index: 0
Wind: 5 mph
11 PM
Cloudy Weather
34°
Feels Like 34°
0
Humidity: 93%
UV Index: 0
Wind: 5 mph

Hourly Air Quality Forecast - AQI (US EPA)

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

Pollutant Concentrations:

  • PM2.5: 3.94 µg/m³
  • PM10: 4.34 µg/m³
  • O3: 0.051 ppm
  • NO2: 1.1 ppb
  • SO2: 0.6 ppb
  • CO: 0.14 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 3.95 µg/m³
  • PM10: 4.39 µg/m³
  • O3: 0.050 ppm
  • NO2: 1.5 ppb
  • SO2: 0.6 ppb
  • CO: 0.14 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: O3
Details

Pollutant Concentrations:

  • PM2.5: 3.97 µg/m³
  • PM10: 4.42 µg/m³
  • O3: 0.049 ppm
  • NO2: 1.4 ppb
  • SO2: 0.5 ppb
  • CO: 0.14 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 4.4 µg/m³
  • PM10: 4.87 µg/m³
  • O3: 0.050 ppm
  • NO2: 1.2 ppb
  • SO2: 0.4 ppb
  • CO: 0.14 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: O3
Details

Pollutant Concentrations:

  • PM2.5: 5.36 µg/m³
  • PM10: 5.89 µg/m³
  • O3: 0.051 ppm
  • NO2: 1.1 ppb
  • SO2: 0.3 ppb
  • CO: 0.14 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 6.87 µg/m³
  • PM10: 7.5 µg/m³
  • O3: 0.052 ppm
  • NO2: 1 ppb
  • SO2: 0.4 ppb
  • CO: 0.14 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 8.92 µg/m³
  • PM10: 9.69 µg/m³
  • O3: 0.055 ppm
  • NO2: 1.1 ppb
  • SO2: 0.5 ppb
  • CO: 0.15 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: O3
Details

Pollutant Concentrations:

  • PM2.5: 10.84 µg/m³
  • PM10: 11.74 µg/m³
  • O3: 0.057 ppm
  • NO2: 1.2 ppb
  • SO2: 0.8 ppb
  • CO: 0.15 ppm

Health Recommendations:

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

4 PM
68 AQI
Moderate air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 12.42 µg/m³
  • PM10: 13.45 µg/m³
  • O3: 0.060 ppm
  • NO2: 1.2 ppb
  • SO2: 1.1 ppb
  • CO: 0.15 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: O3
Details

Pollutant Concentrations:

  • PM2.5: 13.56 µg/m³
  • PM10: 14.72 µg/m³
  • O3: 0.058 ppm
  • NO2: 2.2 ppb
  • SO2: 1 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.

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

Pollutant Concentrations:

  • PM2.5: 14.85 µg/m³
  • PM10: 16.18 µg/m³
  • O3: 0.051 ppm
  • NO2: 4.7 ppb
  • SO2: 0.6 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.

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

Pollutant Concentrations:

  • PM2.5: 16.12 µg/m³
  • PM10: 17.63 µg/m³
  • O3: 0.045 ppm
  • NO2: 8.1 ppb
  • SO2: 0.5 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.

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

Pollutant Concentrations:

  • PM2.5: 17.26 µg/m³
  • PM10: 18.92 µg/m³
  • O3: 0.041 ppm
  • NO2: 9.6 ppb
  • SO2: 0.5 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.

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

Pollutant Concentrations:

  • PM2.5: 18.33 µg/m³
  • PM10: 20.11 µg/m³
  • O3: 0.039 ppm
  • NO2: 9.6 ppb
  • SO2: 0.4 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.

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

Pollutant Concentrations:

  • PM2.5: 19.12 µg/m³
  • PM10: 20.95 µg/m³
  • O3: 0.037 ppm
  • NO2: 9.1 ppb
  • SO2: 0.3 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.

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

Pollutant Concentrations:

  • PM2.5: 19.25 µg/m³
  • PM10: 21.05 µg/m³
  • O3: 0.035 ppm
  • NO2: 8.2 ppb
  • SO2: 0.3 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.