Hourly Weather | Today Wednesday, March 18, 2026
Waukesha, Wisconsin
7 AM
Snowy Weather
21°
Feels Like
48
Frost Risk: 99%
Humidity: 89%
UV Index: 0
Wind: 15 mph
8 AM
Snowy Weather
21°
Feels Like
55
Frost Risk: 100%
Humidity: 86%
UV Index: 0
Wind: 14 mph
9 AM
Snowy Weather
25°
Feels Like
55
Frost Risk: 79%
Humidity: 88%
UV Index: 0
Wind: 15 mph
10 AM
Cloudy Weather
25°
Feels Like 10°
47
Humidity: 88%
UV Index: 1
Wind: 16 mph
11 AM
Cloudy Weather
27°
Feels Like 12°
34
Humidity: 85%
UV Index: 1
Wind: 16 mph
12 PM
Cloudy Weather
28°
Feels Like 16°
34
Humidity: 83%
UV Index: 1
Wind: 16 mph
1 PM
Cloudy Weather
30°
Feels Like 18°
22
Humidity: 82%
UV Index: 1
Wind: 15 mph
2 PM
Cloudy Weather
32°
Feels Like 25°
0
Humidity: 79%
UV Index: 2
Wind: 12 mph
3 PM
Cloudy Weather
34°
Feels Like 25°
0
Humidity: 79%
UV Index: 2
Wind: 12 mph
4 PM
Cloudy Weather
34°
Feels Like 27°
0
Humidity: 80%
UV Index: 1
Wind: 12 mph
5 PM
Cloudy Weather
34°
Feels Like 27°
0
Humidity: 80%
UV Index: 1
Wind: 10 mph
6 PM
Cloudy Weather
32°
Feels Like 25°
0
Humidity: 88%
UV Index: 1
Wind: 9 mph
7 PM
Cloudy Weather
32°
Feels Like 25°
1
Humidity: 89%
UV Index: 0
Wind: 8 mph
8 PM
Cloudy Weather
32°
Feels Like 25°
7
Humidity: 92%
UV Index: 0
Wind: 8 mph
9 PM
Cloudy Weather
30°
Feels Like 25°
7
Humidity: 95%
UV Index: 0
Wind: 7 mph
10 PM
Cloudy Weather
30°
Feels Like 27°
7
Humidity: 98%
UV Index: 0
Wind: 7 mph
11 PM
Cloudy Night
30°
Feels Like 27°
7
Frost Risk: 49%
Humidity: 97%
UV Index: 0
Wind: 6 mph

Hourly Air Quality Forecast - AQI (US EPA)

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

Pollutant Concentrations:

  • PM2.5: 4.02 µg/m³
  • PM10: 4.12 µg/m³
  • O3: 0.050 ppm
  • NO2: 1.3 ppb
  • SO2: 0.5 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: 4.15 µg/m³
  • PM10: 4.29 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.

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

Pollutant Concentrations:

  • PM2.5: 4.11 µg/m³
  • PM10: 4.33 µg/m³
  • O3: 0.050 ppm
  • NO2: 2 ppb
  • SO2: 0.7 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: 4.14 µg/m³
  • PM10: 4.43 µg/m³
  • O3: 0.049 ppm
  • NO2: 2.1 ppb
  • SO2: 0.8 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: 4.86 µg/m³
  • PM10: 5.26 µg/m³
  • O3: 0.050 ppm
  • NO2: 1.7 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
48 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 6.76 µg/m³
  • PM10: 7.27 µg/m³
  • O3: 0.052 ppm
  • NO2: 1.3 ppb
  • SO2: 1 ppb
  • CO: 0.15 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 9.99 µg/m³
  • PM10: 10.58 µg/m³
  • O3: 0.055 ppm
  • NO2: 1.1 ppb
  • SO2: 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.

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

Pollutant Concentrations:

  • PM2.5: 13.81 µg/m³
  • PM10: 14.5 µg/m³
  • O3: 0.060 ppm
  • NO2: 0.9 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.

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

Pollutant Concentrations:

  • PM2.5: 16.89 µg/m³
  • PM10: 17.68 µg/m³
  • O3: 0.063 ppm
  • NO2: 1 ppb
  • SO2: 0.6 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
80 AQI
Moderate air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 19.13 µg/m³
  • PM10: 20.01 µg/m³
  • O3: 0.064 ppm
  • NO2: 1.2 ppb
  • SO2: 0.5 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
78 AQI
Moderate air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 20.94 µg/m³
  • PM10: 21.91 µg/m³
  • O3: 0.063 ppm
  • NO2: 1.9 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.

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

Pollutant Concentrations:

  • PM2.5: 22.09 µg/m³
  • PM10: 23.16 µg/m³
  • O3: 0.059 ppm
  • NO2: 3.5 ppb
  • SO2: 0.4 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
73 AQI
Moderate air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 22.76 µg/m³
  • PM10: 23.92 µg/m³
  • O3: 0.055 ppm
  • NO2: 5.5 ppb
  • SO2: 0.3 ppb
  • CO: 0.19 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 23.17 µg/m³
  • PM10: 24.41 µg/m³
  • O3: 0.051 ppm
  • NO2: 6.2 ppb
  • SO2: 0.4 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.

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

Pollutant Concentrations:

  • PM2.5: 23.76 µg/m³
  • PM10: 25.07 µg/m³
  • O3: 0.049 ppm
  • NO2: 6.3 ppb
  • SO2: 0.4 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.

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

Pollutant Concentrations:

  • PM2.5: 24.35 µg/m³
  • PM10: 25.72 µg/m³
  • O3: 0.047 ppm
  • NO2: 6 ppb
  • SO2: 0.3 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.

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

Pollutant Concentrations:

  • PM2.5: 24.7 µg/m³
  • PM10: 26.08 µg/m³
  • O3: 0.045 ppm
  • NO2: 5.7 ppb
  • SO2: 0.3 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.