Hourly Weather | Today Friday, May 15, 2026
Chicago, Illinois
2 AM
Cloudy Night
55°
Feels Like 50°
22
Humidity: 53%
UV Index: 0
Wind: 9 mph
3 AM
Cloudy Night
54°
Feels Like 48°
22
Humidity: 56%
UV Index: 0
Wind: 9 mph
4 AM
Cloudy Night
54°
Feels Like 48°
27
Humidity: 57%
UV Index: 0
Wind: 9 mph
5 AM
Rainy Night
54°
Feels Like 46°
51
Humidity: 59%
UV Index: 0
Wind: 10 mph
6 AM
Cloudy Weather
55°
Feels Like 48°
47
Humidity: 60%
UV Index: 0
Wind: 10 mph
7 AM
Cloudy Weather
55°
Feels Like 50°
41
Humidity: 61%
UV Index: 1
Wind: 12 mph
8 AM
Partly Sunny with Showers
55°
Feels Like 52°
42
Humidity: 62%
UV Index: 2
Wind: 12 mph
9 AM
Cloudy Weather
57°
Feels Like 55°
38
Humidity: 63%
UV Index: 3
Wind: 13 mph
10 AM
Cloudy Weather
57°
Feels Like 57°
35
Humidity: 64%
UV Index: 5
Wind: 13 mph
11 AM
Cloudy Weather
59°
Feels Like 61°
34
Humidity: 63%
UV Index: 7
Wind: 14 mph
12 PM
Cloudy Weather
61°
Feels Like 63°
34
Humidity: 60%
UV Index: 9
Wind: 16 mph
1 PM
Cloudy Weather
63°
Feels Like 64°
29
Humidity: 59%
UV Index: 9
Wind: 16 mph
2 PM
Cloudy Weather
64°
Feels Like 66°
20
Humidity: 56%
UV Index: 9
Wind: 16 mph
3 PM
Cloudy Weather
66°
Feels Like 70°
20
Humidity: 53%
UV Index: 7
Wind: 15 mph
4 PM
Cloudy Weather
68°
Feels Like 70°
20
Humidity: 50%
UV Index: 5
Wind: 15 mph
5 PM
Cloudy Weather
70°
Feels Like 70°
20
Humidity: 48%
UV Index: 3
Wind: 14 mph
6 PM
Cloudy Weather
68°
Feels Like 66°
20
Humidity: 52%
UV Index: 2
Wind: 13 mph
7 PM
Cloudy Weather
66°
Feels Like 64°
15
Humidity: 56%
UV Index: 1
Wind: 13 mph
8 PM
Cloudy Weather
66°
Feels Like 63°
5
Humidity: 60%
UV Index: 0
Wind: 13 mph
9 PM
Cloudy Night
64°
Feels Like 61°
5
Humidity: 65%
UV Index: 0
Wind: 13 mph
10 PM
Cloudy Night
64°
Feels Like 61°
6
Humidity: 67%
UV Index: 0
Wind: 12 mph
11 PM
Cloudy Night
63°
Feels Like 59°
7
Humidity: 71%
UV Index: 0
Wind: 12 mph

Hourly Air Quality Forecast - AQI (US EPA)

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

Pollutant Concentrations:

  • PM2.5: 4.31 µg/m³
  • PM10: 4.58 µg/m³
  • O3: 0.045 ppm
  • NO2: 1.6 ppb
  • SO2: 0.5 ppb
  • CO: 0.12 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 4.88 µg/m³
  • PM10: 5.09 µg/m³
  • O3: 0.046 ppm
  • NO2: 1.4 ppb
  • SO2: 0.6 ppb
  • CO: 0.12 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: 5.24 µg/m³
  • PM10: 5.42 µg/m³
  • O3: 0.047 ppm
  • NO2: 1.2 ppb
  • SO2: 0.6 ppb
  • CO: 0.11 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 4.98 µg/m³
  • PM10: 5.16 µg/m³
  • O3: 0.048 ppm
  • NO2: 1.1 ppb
  • SO2: 0.6 ppb
  • CO: 0.11 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 4.33 µg/m³
  • PM10: 4.52 µg/m³
  • O3: 0.048 ppm
  • NO2: 1 ppb
  • SO2: 0.6 ppb
  • CO: 0.11 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: O3
Details

Pollutant Concentrations:

  • PM2.5: 3.72 µg/m³
  • PM10: 3.92 µg/m³
  • O3: 0.048 ppm
  • NO2: 1.2 ppb
  • SO2: 0.6 ppb
  • CO: 0.11 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 3.5 µg/m³
  • PM10: 3.68 µg/m³
  • O3: 0.047 ppm
  • NO2: 1.6 ppb
  • SO2: 0.7 ppb
  • CO: 0.11 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: 3.66 µg/m³
  • PM10: 3.79 µg/m³
  • O3: 0.047 ppm
  • NO2: 2 ppb
  • SO2: 0.7 ppb
  • CO: 0.11 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 3.77 µg/m³
  • PM10: 3.86 µg/m³
  • O3: 0.047 ppm
  • NO2: 2 ppb
  • SO2: 0.6 ppb
  • CO: 0.11 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 3.62 µg/m³
  • PM10: 3.68 µg/m³
  • O3: 0.051 ppm
  • NO2: 1.6 ppb
  • SO2: 0.5 ppb
  • CO: 0.11 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 3.8 µg/m³
  • PM10: 3.86 µg/m³
  • O3: 0.053 ppm
  • NO2: 1.3 ppb
  • SO2: 0.4 ppb
  • CO: 0.11 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 4.05 µg/m³
  • PM10: 4.11 µg/m³
  • O3: 0.054 ppm
  • NO2: 1.1 ppb
  • SO2: 0.4 ppb
  • CO: 0.11 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: 4.24 µg/m³
  • PM10: 4.3 µg/m³
  • O3: 0.056 ppm
  • NO2: 0.9 ppb
  • SO2: 0.4 ppb
  • CO: 0.11 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 4.72 µg/m³
  • PM10: 4.8 µg/m³
  • O3: 0.056 ppm
  • NO2: 0.8 ppb
  • SO2: 0.5 ppb
  • CO: 0.11 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 5.31 µg/m³
  • PM10: 5.4 µg/m³
  • O3: 0.056 ppm
  • NO2: 0.7 ppb
  • SO2: 0.5 ppb
  • CO: 0.11 ppm

Health Recommendations:

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

5 PM
61 AQI
Moderate air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 5.91 µg/m³
  • PM10: 6.02 µg/m³
  • O3: 0.057 ppm
  • NO2: 0.7 ppb
  • SO2: 0.6 ppb
  • CO: 0.11 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 6.33 µg/m³
  • PM10: 6.47 µg/m³
  • O3: 0.057 ppm
  • NO2: 0.8 ppb
  • SO2: 0.6 ppb
  • CO: 0.12 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 6.57 µg/m³
  • PM10: 6.74 µg/m³
  • O3: 0.056 ppm
  • NO2: 1.1 ppb
  • SO2: 0.7 ppb
  • CO: 0.12 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 6.69 µg/m³
  • PM10: 6.9 µg/m³
  • O3: 0.054 ppm
  • NO2: 1.5 ppb
  • SO2: 0.7 ppb
  • CO: 0.12 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 6.77 µg/m³
  • PM10: 7.04 µg/m³
  • O3: 0.050 ppm
  • NO2: 1.7 ppb
  • SO2: 0.8 ppb
  • CO: 0.12 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 6.81 µg/m³
  • PM10: 7.12 µg/m³
  • O3: 0.048 ppm
  • NO2: 1.9 ppb
  • SO2: 0.8 ppb
  • CO: 0.13 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 6.66 µg/m³
  • PM10: 7.01 µg/m³
  • O3: 0.045 ppm
  • NO2: 2 ppb
  • SO2: 0.8 ppb
  • CO: 0.13 ppm

Health Recommendations:

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