Hourly Weather | Today Wednesday, March 18, 2026
Madison, Wisconsin
6 AM
Cloudy Weather
21°
Feels Like
49
Frost Risk: 99%
Humidity: 90%
UV Index: 0
Wind: 16 mph
7 AM
Snowy Weather
21°
Feels Like
61
Frost Risk: 99%
Humidity: 93%
UV Index: 0
Wind: 14 mph
8 AM
Cloudy Weather
25°
Feels Like 12°
6
Frost Risk: 55%
Humidity: 82%
UV Index: 0
Wind: 10 mph
9 AM
Cloudy Weather
27°
Feels Like 16°
3
Humidity: 84%
UV Index: 1
Wind: 10 mph
10 AM
Cloudy Weather
28°
Feels Like 19°
3
Humidity: 83%
UV Index: 1
Wind: 10 mph
11 AM
Cloudy Weather
28°
Feels Like 21°
3
Humidity: 81%
UV Index: 1
Wind: 10 mph
12 PM
Cloudy Weather
30°
Feels Like 25°
3
Humidity: 80%
UV Index: 1
Wind: 9 mph
1 PM
Cloudy Weather
32°
Feels Like 27°
2
Humidity: 79%
UV Index: 1
Wind: 9 mph
2 PM
Cloudy Weather
34°
Feels Like 30°
0
Humidity: 78%
UV Index: 1
Wind: 8 mph
3 PM
Cloudy Weather
36°
Feels Like 32°
0
Humidity: 78%
UV Index: 1
Wind: 8 mph
4 PM
Cloudy Weather
36°
Feels Like 34°
0
Humidity: 78%
UV Index: 1
Wind: 7 mph
5 PM
Cloudy Weather
37°
Feels Like 34°
0
Humidity: 77%
UV Index: 1
Wind: 7 mph
6 PM
Cloudy Weather
36°
Feels Like 34°
0
Humidity: 81%
UV Index: 0
Wind: 7 mph
7 PM
Cloudy Weather
36°
Feels Like 32°
0
Humidity: 84%
UV Index: 0
Wind: 6 mph
8 PM
Rainy Weather
36°
Feels Like 30°
47
Humidity: 85%
UV Index: 0
Wind: 6 mph
9 PM
Rainy Weather
34°
Feels Like 28°
47
Humidity: 89%
UV Index: 0
Wind: 6 mph
10 PM
Cloudy Weather
34°
Feels Like 30°
43
Humidity: 93%
UV Index: 0
Wind: 5 mph
11 PM
Cloudy Weather
34°
Feels Like 30°
17
Humidity: 93%
UV Index: 0
Wind: 5 mph

Hourly Air Quality Forecast - AQI (US EPA)

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

Pollutant Concentrations:

  • PM2.5: 4.94 µg/m³
  • PM10: 5.13 µg/m³
  • O3: 0.050 ppm
  • NO2: 1.5 ppb
  • SO2: 0.9 ppb
  • CO: 0.14 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 5.76 µg/m³
  • PM10: 6 µg/m³
  • O3: 0.049 ppm
  • NO2: 1.6 ppb
  • SO2: 1 ppb
  • CO: 0.14 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: 6.28 µg/m³
  • PM10: 6.58 µg/m³
  • O3: 0.048 ppm
  • NO2: 1.9 ppb
  • SO2: 1.1 ppb
  • CO: 0.15 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 6.42 µg/m³
  • PM10: 6.8 µg/m³
  • O3: 0.047 ppm
  • NO2: 2.5 ppb
  • SO2: 1.1 ppb
  • CO: 0.15 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 6.66 µg/m³
  • PM10: 7.12 µg/m³
  • O3: 0.047 ppm
  • NO2: 2.2 ppb
  • SO2: 1.1 ppb
  • CO: 0.15 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 7.72 µg/m³
  • PM10: 8.28 µg/m³
  • O3: 0.048 ppm
  • NO2: 1.8 ppb
  • SO2: 1 ppb
  • CO: 0.15 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 10.15 µg/m³
  • PM10: 10.81 µg/m³
  • O3: 0.049 ppm
  • NO2: 1.5 ppb
  • SO2: 0.9 ppb
  • CO: 0.16 ppm

Health Recommendations:

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

1 PM
54 AQI
Moderate air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 14 µg/m³
  • PM10: 14.74 µg/m³
  • O3: 0.053 ppm
  • NO2: 1.3 ppb
  • SO2: 0.8 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.

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

Pollutant Concentrations:

  • PM2.5: 18.61 µg/m³
  • PM10: 19.43 µg/m³
  • O3: 0.057 ppm
  • NO2: 1.2 ppb
  • SO2: 0.6 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.

3 PM
72 AQI
Moderate air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 22.5 µg/m³
  • PM10: 23.43 µg/m³
  • O3: 0.060 ppm
  • NO2: 1.2 ppb
  • SO2: 0.5 ppb
  • CO: 0.17 ppm

Health Recommendations:

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

4 PM
79 AQI
Moderate air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 25.34 µg/m³
  • PM10: 26.38 µg/m³
  • O3: 0.062 ppm
  • NO2: 1.4 ppb
  • SO2: 0.4 ppb
  • CO: 0.17 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 27.4 µg/m³
  • PM10: 28.55 µg/m³
  • O3: 0.061 ppm
  • NO2: 2.1 ppb
  • SO2: 0.3 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.

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

Pollutant Concentrations:

  • PM2.5: 28.44 µg/m³
  • PM10: 29.72 µg/m³
  • O3: 0.057 ppm
  • NO2: 3.8 ppb
  • SO2: 0.3 ppb
  • CO: 0.20 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 28.75 µg/m³
  • PM10: 30.15 µg/m³
  • O3: 0.052 ppm
  • NO2: 6.3 ppb
  • SO2: 0.2 ppb
  • CO: 0.22 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 28.62 µg/m³
  • PM10: 30.1 µg/m³
  • O3: 0.047 ppm
  • NO2: 7.3 ppb
  • SO2: 0.2 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
84 AQI
Moderate air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 28.09 µg/m³
  • PM10: 29.53 µg/m³
  • O3: 0.046 ppm
  • NO2: 6.8 ppb
  • SO2: 0.2 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
82 AQI
Moderate air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 26.96 µg/m³
  • PM10: 28.26 µg/m³
  • O3: 0.048 ppm
  • NO2: 5.7 ppb
  • SO2: 0.3 ppb
  • CO: 0.22 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 25.28 µg/m³
  • PM10: 26.46 µg/m³
  • O3: 0.048 ppm
  • NO2: 4.8 ppb
  • SO2: 0.2 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.