Hourly Weather | Today Wednesday, March 18, 2026
Milwaukee, Wisconsin
4 AM
Snowy Weather
21°
Feels Like
59
Frost Risk: 100%
Humidity: 94%
UV Index: 0
Wind: 17 mph
5 AM
Cloudy Weather
21°
Feels Like
40
Frost Risk: 99%
Humidity: 89%
UV Index: 0
Wind: 17 mph
6 AM
Cloudy Weather
23°
Feels Like
34
Frost Risk: 96%
Humidity: 87%
UV Index: 0
Wind: 17 mph
7 AM
Cloudy Weather
25°
Feels Like
40
Frost Risk: 74%
Humidity: 88%
UV Index: 0
Wind: 16 mph
8 AM
Snowy Weather
25°
Feels Like
65
Frost Risk: 87%
Humidity: 89%
UV Index: 0
Wind: 18 mph
9 AM
Snowy Weather
27°
Feels Like
65
Frost Risk: 46%
Humidity: 87%
UV Index: 0
Wind: 17 mph
10 AM
Snowy Weather
28°
Feels Like 12°
65
Humidity: 84%
UV Index: 1
Wind: 16 mph
11 AM
Cloudy Weather
30°
Feels Like 18°
40
Humidity: 81%
UV Index: 1
Wind: 15 mph
12 PM
Cloudy Weather
32°
Feels Like 21°
34
Humidity: 79%
UV Index: 1
Wind: 14 mph
1 PM
Cloudy Weather
34°
Feels Like 25°
22
Humidity: 77%
UV Index: 1
Wind: 14 mph
2 PM
Cloudy Weather
36°
Feels Like 30°
0
Humidity: 76%
UV Index: 1
Wind: 9 mph
3 PM
Cloudy Weather
36°
Feels Like 32°
0
Humidity: 77%
UV Index: 1
Wind: 8 mph
4 PM
Cloudy Weather
37°
Feels Like 32°
0
Humidity: 78%
UV Index: 1
Wind: 8 mph
5 PM
Cloudy Weather
37°
Feels Like 34°
0
Humidity: 77%
UV Index: 1
Wind: 8 mph
6 PM
Cloudy Weather
36°
Feels Like 30°
0
Humidity: 83%
UV Index: 0
Wind: 8 mph
7 PM
Cloudy Weather
36°
Feels Like 30°
1
Humidity: 85%
UV Index: 0
Wind: 7 mph
8 PM
Cloudy Weather
36°
Feels Like 30°
7
Humidity: 88%
UV Index: 0
Wind: 7 mph
9 PM
Cloudy Weather
34°
Feels Like 28°
7
Humidity: 90%
UV Index: 0
Wind: 7 mph
10 PM
Cloudy Weather
34°
Feels Like 28°
7
Humidity: 93%
UV Index: 0
Wind: 7 mph
11 PM
Cloudy Night
34°
Feels Like 28°
7
Humidity: 94%
UV Index: 0
Wind: 7 mph

Hourly Air Quality Forecast - AQI (US EPA)

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

Pollutant Concentrations:

  • PM2.5: 3.74 µg/m³
  • PM10: 3.94 µg/m³
  • O3: 0.051 ppm
  • NO2: 1.8 ppb
  • SO2: 0.6 ppb
  • CO: 0.14 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 3.67 µg/m³
  • PM10: 3.87 µg/m³
  • O3: 0.051 ppm
  • NO2: 1.7 ppb
  • SO2: 0.6 ppb
  • CO: 0.14 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 3.72 µg/m³
  • PM10: 3.92 µg/m³
  • O3: 0.051 ppm
  • NO2: 1.7 ppb
  • SO2: 0.6 ppb
  • CO: 0.14 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 3.85 µg/m³
  • PM10: 4.05 µg/m³
  • O3: 0.050 ppm
  • NO2: 1.7 ppb
  • SO2: 0.6 ppb
  • CO: 0.14 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 3.97 µg/m³
  • PM10: 4.26 µg/m³
  • O3: 0.049 ppm
  • NO2: 2.1 ppb
  • SO2: 0.7 ppb
  • CO: 0.15 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 4.04 µg/m³
  • PM10: 4.45 µg/m³
  • O3: 0.048 ppm
  • NO2: 2.9 ppb
  • SO2: 0.8 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: 4.16 µg/m³
  • PM10: 4.67 µg/m³
  • O3: 0.048 ppm
  • NO2: 3.2 ppb
  • SO2: 1 ppb
  • CO: 0.15 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 4.79 µg/m³
  • PM10: 5.46 µg/m³
  • O3: 0.049 ppm
  • NO2: 2.8 ppb
  • SO2: 1.2 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: 6.33 µg/m³
  • PM10: 7.14 µg/m³
  • O3: 0.050 ppm
  • NO2: 2.3 ppb
  • SO2: 1.3 ppb
  • CO: 0.15 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 9.1 µg/m³
  • PM10: 10 µg/m³
  • O3: 0.053 ppm
  • NO2: 2 ppb
  • SO2: 1.2 ppb
  • CO: 0.15 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 12.83 µg/m³
  • PM10: 13.81 µg/m³
  • O3: 0.058 ppm
  • NO2: 1.7 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.

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

Pollutant Concentrations:

  • PM2.5: 15.92 µg/m³
  • PM10: 16.98 µg/m³
  • O3: 0.061 ppm
  • NO2: 1.8 ppb
  • SO2: 0.9 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.

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

Pollutant Concentrations:

  • PM2.5: 17.97 µg/m³
  • PM10: 19.11 µg/m³
  • O3: 0.063 ppm
  • NO2: 2.2 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.

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

Pollutant Concentrations:

  • PM2.5: 19.89 µg/m³
  • PM10: 21.21 µg/m³
  • O3: 0.062 ppm
  • NO2: 3.4 ppb
  • SO2: 0.7 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
70 AQI
Moderate air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 21.44 µg/m³
  • PM10: 23.05 µg/m³
  • O3: 0.056 ppm
  • NO2: 6.7 ppb
  • SO2: 0.5 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
73 AQI
Moderate air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 22.55 µg/m³
  • PM10: 24.47 µg/m³
  • O3: 0.049 ppm
  • NO2: 10.8 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.

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

Pollutant Concentrations:

  • PM2.5: 23.58 µg/m³
  • PM10: 25.85 µg/m³
  • O3: 0.044 ppm
  • NO2: 12.5 ppb
  • SO2: 0.5 ppb
  • CO: 0.25 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 24.69 µg/m³
  • PM10: 27.19 µg/m³
  • O3: 0.041 ppm
  • NO2: 12.2 ppb
  • SO2: 0.5 ppb
  • CO: 0.25 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 25.67 µg/m³
  • PM10: 28.17 µg/m³
  • O3: 0.040 ppm
  • NO2: 11.1 ppb
  • SO2: 0.5 ppb
  • CO: 0.25 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 26.29 µg/m³
  • PM10: 28.75 µg/m³
  • O3: 0.039 ppm
  • NO2: 10 ppb
  • SO2: 0.5 ppb
  • CO: 0.25 ppm

Health Recommendations:

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