Hourly Weather | Today Monday, September 21, 2026
Janesville, Wisconsin
3 PM
Rainy Weather
63°
Feels Like 57°
41
Humidity: 75%
UV Index: 1
Wind: 15 mph
4 PM
Cloudy Weather
61°
Feels Like 57°
37
Humidity: 78%
UV Index: 1
Wind: 15 mph
5 PM
Cloudy Weather
61°
Feels Like 55°
34
Humidity: 79%
UV Index: 1
Wind: 15 mph
6 PM
Cloudy Weather
61°
Feels Like 55°
34
Humidity: 81%
UV Index: 0
Wind: 14 mph
7 PM
Cloudy Night
59°
Feels Like 54°
34
Humidity: 82%
UV Index: 0
Wind: 14 mph
8 PM
Cloudy Night
55°
Feels Like 52°
34
Humidity: 91%
UV Index: 0
Wind: 10 mph
9 PM
Cloudy Night
54°
Feels Like 48°
34
Humidity: 95%
UV Index: 0
Wind: 9 mph
10 PM
Cloudy Night
54°
Feels Like 48°
37
Humidity: 90%
UV Index: 0
Wind: 8 mph
11 PM
Cloudy Night
54°
Feels Like 50°
43
Humidity: 87%
UV Index: 0
Wind: 8 mph

Hourly Air Quality Forecast - AQI (US EPA)

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

Pollutant Concentrations:

  • PM2.5: 1.62 µg/m³
  • PM10: 1.82 µg/m³
  • O3: 0.025 ppm
  • NO2: 2.6 ppb
  • SO2: 0.4 ppb
  • CO: 0.16 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 1.67 µg/m³
  • PM10: 1.92 µg/m³
  • O3: 0.025 ppm
  • NO2: 2.7 ppb
  • SO2: 0.4 ppb
  • CO: 0.16 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 1.67 µg/m³
  • PM10: 1.97 µg/m³
  • O3: 0.025 ppm
  • NO2: 3 ppb
  • SO2: 0.5 ppb
  • CO: 0.17 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 1.6 µg/m³
  • PM10: 1.96 µg/m³
  • O3: 0.025 ppm
  • NO2: 3.2 ppb
  • SO2: 0.5 ppb
  • CO: 0.17 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 1.5 µg/m³
  • PM10: 1.9 µg/m³
  • O3: 0.025 ppm
  • NO2: 3.3 ppb
  • SO2: 0.6 ppb
  • CO: 0.17 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 1.41 µg/m³
  • PM10: 1.8 µg/m³
  • O3: 0.024 ppm
  • NO2: 3.1 ppb
  • SO2: 0.6 ppb
  • CO: 0.17 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 1.36 µg/m³
  • PM10: 1.67 µg/m³
  • O3: 0.025 ppm
  • NO2: 3 ppb
  • SO2: 0.5 ppb
  • CO: 0.17 ppm

Health Recommendations:

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

10 PM
23 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 1.32 µg/m³
  • PM10: 1.56 µg/m³
  • O3: 0.025 ppm
  • NO2: 2.8 ppb
  • SO2: 0.5 ppb
  • CO: 0.17 ppm

Health Recommendations:

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

11 PM
24 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 1.28 µg/m³
  • PM10: 1.49 µg/m³
  • O3: 0.026 ppm
  • NO2: 2.6 ppb
  • SO2: 0.5 ppb
  • CO: 0.16 ppm

Health Recommendations:

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