Hourly Weather | Today Tuesday, September 1, 2026
West Allis, Wisconsin
11 AM
Cloudy Weather
84°
Feels Like 97°
20
Humidity: 69%
UV Index: 5
Wind: 7 mph
12 PM
Cloudy Weather
88°
Feels Like 99°
20
Humidity: 63%
UV Index: 6
Wind: 8 mph
1 PM
Cloudy Weather
88°
Feels Like 99°
25
Humidity: 59%
UV Index: 6
Wind: 8 mph
2 PM
Cloudy Weather
90°
Feels Like 99°
47
Humidity: 57%
UV Index: 6
Wind: 9 mph
3 PM
Partly Sunny with Showers
88°
Feels Like 97°
51
Humidity: 62%
UV Index: 4
Wind: 9 mph
4 PM
Cloudy Weather
90°
Feels Like 99°
47
Humidity: 55%
UV Index: 3
Wind: 9 mph
5 PM
Cloudy Weather
90°
Feels Like 97°
21
Humidity: 58%
UV Index: 2
Wind: 8 mph
6 PM
Cloudy Weather
88°
Feels Like 93°
21
Humidity: 63%
UV Index: 1
Wind: 7 mph
7 PM
Cloudy Weather
84°
Feels Like 91°
26
Humidity: 70%
UV Index: 0
Wind: 6 mph
8 PM
Stormy Weather
82°
Feels Like 88°
51
Humidity: 76%
UV Index: 0
Wind: 6 mph
9 PM
Cloudy Night
81°
Feels Like 88°
47
Humidity: 78%
UV Index: 0
Wind: 6 mph
10 PM
Cloudy Night
81°
Feels Like 88°
44
Humidity: 81%
UV Index: 0
Wind: 6 mph
11 PM
Cloudy Night
79°
Feels Like 86°
49
Humidity: 84%
UV Index: 0
Wind: 6 mph

Hourly Air Quality Forecast - AQI (US EPA)

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

Pollutant Concentrations:

  • PM2.5: 11.98 µg/m³
  • PM10: 12.69 µg/m³
  • O3: 0.024 ppm
  • NO2: 1.2 ppb
  • SO2: 0.2 ppb
  • CO: 0.13 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 13.15 µg/m³
  • PM10: 13.86 µg/m³
  • O3: 0.030 ppm
  • NO2: 0.9 ppb
  • SO2: 0.1 ppb
  • CO: 0.13 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 14.21 µg/m³
  • PM10: 14.9 µg/m³
  • O3: 0.035 ppm
  • NO2: 0.7 ppb
  • SO2: 0.1 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.

2 PM
46 AQI
Good air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 11.04 µg/m³
  • PM10: 11.52 µg/m³
  • O3: 0.041 ppm
  • NO2: 0.6 ppb
  • SO2: 0.1 ppb
  • CO: 0.12 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 7.3 µg/m³
  • PM10: 7.59 µg/m³
  • O3: 0.042 ppm
  • NO2: 0.6 ppb
  • SO2: 0.1 ppb
  • CO: 0.11 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 5.13 µg/m³
  • PM10: 5.35 µg/m³
  • O3: 0.042 ppm
  • NO2: 0.7 ppb
  • SO2: 0.1 ppb
  • CO: 0.10 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 4.02 µg/m³
  • PM10: 4.24 µg/m³
  • O3: 0.042 ppm
  • NO2: 1 ppb
  • SO2: 0.1 ppb
  • CO: 0.10 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 3.94 µg/m³
  • PM10: 4.22 µg/m³
  • O3: 0.041 ppm
  • NO2: 1.5 ppb
  • SO2: 0.1 ppb
  • CO: 0.11 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 4.77 µg/m³
  • PM10: 5.14 µg/m³
  • O3: 0.041 ppm
  • NO2: 1.9 ppb
  • SO2: 0.2 ppb
  • CO: 0.11 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 6 µg/m³
  • PM10: 6.45 µg/m³
  • O3: 0.039 ppm
  • NO2: 2.3 ppb
  • SO2: 0.3 ppb
  • CO: 0.11 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 7.13 µg/m³
  • PM10: 7.66 µg/m³
  • O3: 0.037 ppm
  • NO2: 2.4 ppb
  • SO2: 0.3 ppb
  • CO: 0.11 ppm

Health Recommendations:

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

10 PM
33 AQI
Good air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 7.91 µg/m³
  • PM10: 8.5 µg/m³
  • O3: 0.036 ppm
  • NO2: 2.4 ppb
  • SO2: 0.4 ppb
  • CO: 0.11 ppm

Health Recommendations:

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

11 PM
34 AQI
Good air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 8.19 µg/m³
  • PM10: 8.8 µg/m³
  • O3: 0.034 ppm
  • NO2: 2.4 ppb
  • SO2: 0.4 ppb
  • CO: 0.11 ppm

Health Recommendations:

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