Hourly Weather | Today Wednesday, March 18, 2026
Appleton, Wisconsin
4 AM
Snowy Weather
14°
Feels Like
72
Frost Risk: 100%
Humidity: 97%
UV Index: 0
Wind: 10 mph
5 AM
Cloudy Weather
16°
Feels Like
49
Frost Risk: 100%
Humidity: 100%
UV Index: 0
Wind: 10 mph
6 AM
Cloudy Weather
18°
Feels Like
49
Frost Risk: 100%
Humidity: 100%
UV Index: 0
Wind: 9 mph
7 AM
Snowy Weather
19°
Feels Like
56
Frost Risk: 100%
Humidity: 94%
UV Index: 0
Wind: 9 mph
8 AM
Cloudy Weather
21°
Feels Like 10°
40
Frost Risk: 98%
Humidity: 83%
UV Index: 0
Wind: 10 mph
9 AM
Snowy Weather
23°
Feels Like 10°
48
Frost Risk: 92%
Humidity: 86%
UV Index: 0
Wind: 10 mph
10 AM
Snowy Weather
25°
Feels Like 12°
48
Humidity: 88%
UV Index: 1
Wind: 10 mph
11 AM
Cloudy Weather
27°
Feels Like 16°
38
Humidity: 86%
UV Index: 1
Wind: 12 mph
12 PM
Cloudy Weather
28°
Feels Like 19°
32
Humidity: 84%
UV Index: 1
Wind: 12 mph
1 PM
Cloudy Weather
30°
Feels Like 21°
28
Humidity: 83%
UV Index: 1
Wind: 12 mph
2 PM
Cloudy Weather
30°
Feels Like 25°
20
Humidity: 77%
UV Index: 2
Wind: 10 mph
3 PM
Cloudy Weather
34°
Feels Like 27°
20
Humidity: 72%
UV Index: 2
Wind: 10 mph
4 PM
Cloudy Weather
34°
Feels Like 27°
20
Humidity: 69%
UV Index: 1
Wind: 9 mph
5 PM
Cloudy Weather
34°
Feels Like 28°
20
Humidity: 68%
UV Index: 1
Wind: 9 mph
6 PM
Cloudy Weather
34°
Feels Like 28°
20
Humidity: 75%
UV Index: 0
Wind: 8 mph
7 PM
Cloudy Weather
34°
Feels Like 27°
25
Humidity: 79%
UV Index: 0
Wind: 8 mph
8 PM
Cloudy Weather
32°
Feels Like 27°
43
Humidity: 83%
UV Index: 0
Wind: 7 mph
9 PM
Cloudy Weather
34°
Feels Like 28°
47
Humidity: 81%
UV Index: 0
Wind: 7 mph
10 PM
Rainy Weather
34°
Feels Like 27°
51
Humidity: 84%
UV Index: 0
Wind: 7 mph
11 PM
Rainy Weather
34°
Feels Like 27°
51
Humidity: 87%
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: 4.49 µg/m³
  • PM10: 4.58 µg/m³
  • O3: 0.051 ppm
  • NO2: 1.6 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: 4.21 µg/m³
  • PM10: 4.29 µg/m³
  • O3: 0.051 ppm
  • NO2: 1.5 ppb
  • SO2: 0.5 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: 3.97 µg/m³
  • PM10: 4.05 µg/m³
  • O3: 0.051 ppm
  • NO2: 1.4 ppb
  • SO2: 0.5 ppb
  • CO: 0.14 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 3.87 µg/m³
  • PM10: 3.96 µg/m³
  • O3: 0.051 ppm
  • NO2: 1.4 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
47 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 4.05 µg/m³
  • PM10: 4.19 µg/m³
  • O3: 0.050 ppm
  • NO2: 1.6 ppb
  • SO2: 0.5 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: 4.41 µg/m³
  • PM10: 4.61 µg/m³
  • O3: 0.050 ppm
  • NO2: 2.3 ppb
  • SO2: 0.6 ppb
  • CO: 0.15 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 4.88 µg/m³
  • PM10: 5.15 µg/m³
  • O3: 0.049 ppm
  • NO2: 2.5 ppb
  • SO2: 0.7 ppb
  • CO: 0.15 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: 5.65 µg/m³
  • PM10: 5.99 µg/m³
  • O3: 0.049 ppm
  • NO2: 2.3 ppb
  • SO2: 0.8 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: 6.92 µg/m³
  • PM10: 7.31 µg/m³
  • O3: 0.050 ppm
  • NO2: 1.9 ppb
  • SO2: 0.9 ppb
  • CO: 0.15 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 9.08 µg/m³
  • PM10: 9.52 µg/m³
  • O3: 0.051 ppm
  • NO2: 1.6 ppb
  • SO2: 1 ppb
  • CO: 0.15 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: 12.51 µg/m³
  • PM10: 12.98 µg/m³
  • O3: 0.056 ppm
  • NO2: 1.1 ppb
  • SO2: 0.9 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
67 AQI
Moderate air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 15.59 µg/m³
  • PM10: 16.11 µg/m³
  • O3: 0.060 ppm
  • NO2: 1.1 ppb
  • SO2: 0.7 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
74 AQI
Moderate air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 17.49 µg/m³
  • PM10: 18.06 µg/m³
  • O3: 0.062 ppm
  • NO2: 1.2 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.

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

Pollutant Concentrations:

  • PM2.5: 18.93 µg/m³
  • PM10: 19.56 µg/m³
  • O3: 0.063 ppm
  • NO2: 1.5 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.

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

Pollutant Concentrations:

  • PM2.5: 20.01 µg/m³
  • PM10: 20.69 µg/m³
  • O3: 0.063 ppm
  • NO2: 2.4 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.

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

Pollutant Concentrations:

  • PM2.5: 20.83 µg/m³
  • PM10: 21.56 µg/m³
  • O3: 0.061 ppm
  • NO2: 3.1 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.

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

Pollutant Concentrations:

  • PM2.5: 21.46 µg/m³
  • PM10: 22.24 µg/m³
  • O3: 0.060 ppm
  • NO2: 3.1 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.

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

Pollutant Concentrations:

  • PM2.5: 22.11 µg/m³
  • PM10: 22.94 µg/m³
  • O3: 0.059 ppm
  • NO2: 2.9 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.

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

Pollutant Concentrations:

  • PM2.5: 22.61 µg/m³
  • PM10: 23.48 µg/m³
  • O3: 0.059 ppm
  • NO2: 2.5 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.

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

Pollutant Concentrations:

  • PM2.5: 22.82 µg/m³
  • PM10: 23.68 µg/m³
  • O3: 0.058 ppm
  • NO2: 2.3 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.