Hourly Weather | Today Monday, September 21, 2026
Waterloo, Iowa
2 PM
Cloudy Weather
57°
Feels Like 55°
40
Humidity: 87%
UV Index: 1
Wind: 10 mph
3 PM
Cloudy Weather
59°
Feels Like 55°
34
Humidity: 85%
UV Index: 1
Wind: 10 mph
4 PM
Cloudy Weather
61°
Feels Like 57°
40
Humidity: 82%
UV Index: 1
Wind: 10 mph
5 PM
Rainy Weather
61°
Feels Like 54°
60
Humidity: 84%
UV Index: 0
Wind: 10 mph
6 PM
Cloudy Weather
59°
Feels Like 55°
49
Humidity: 84%
UV Index: 0
Wind: 10 mph
7 PM
Rainy Weather
57°
Feels Like 52°
60
Humidity: 87%
UV Index: 0
Wind: 9 mph
8 PM
Cloudy Night
55°
Feels Like 54°
49
Humidity: 92%
UV Index: 0
Wind: 9 mph
9 PM
Cloudy Night
55°
Feels Like 52°
49
Humidity: 96%
UV Index: 0
Wind: 9 mph
10 PM
Rainy Night
55°
Feels Like 48°
53
Humidity: 96%
UV Index: 0
Wind: 9 mph
11 PM
Rainy Night
55°
Feels Like 48°
51
Humidity: 94%
UV Index: 0
Wind: 9 mph

Hourly Air Quality Forecast - AQI (US EPA)

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

Pollutant Concentrations:

  • PM2.5: 1.84 µg/m³
  • PM10: 1.91 µg/m³
  • O3: 0.025 ppm
  • NO2: 1.5 ppb
  • SO2: 0.1 ppb
  • CO: 0.16 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 1.81 µg/m³
  • PM10: 1.88 µg/m³
  • O3: 0.025 ppm
  • NO2: 1.5 ppb
  • SO2: 0.1 ppb
  • CO: 0.16 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 1.65 µg/m³
  • PM10: 1.72 µg/m³
  • O3: 0.026 ppm
  • NO2: 1.5 ppb
  • SO2: 0.1 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: 1.37 µg/m³
  • PM10: 1.43 µg/m³
  • O3: 0.025 ppm
  • NO2: 1.7 ppb
  • SO2: 0.1 ppb
  • CO: 0.16 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 1.1 µg/m³
  • PM10: 1.15 µg/m³
  • O3: 0.024 ppm
  • NO2: 1.9 ppb
  • SO2: 0.1 ppb
  • CO: 0.16 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 0.95 µg/m³
  • PM10: 1 µg/m³
  • O3: 0.022 ppm
  • NO2: 2.1 ppb
  • SO2: 0.1 ppb
  • CO: 0.16 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 0.9 µg/m³
  • PM10: 0.95 µg/m³
  • O3: 0.021 ppm
  • NO2: 2.1 ppb
  • SO2: 0.1 ppb
  • CO: 0.16 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 0.94 µg/m³
  • PM10: 0.98 µg/m³
  • O3: 0.021 ppm
  • NO2: 2 ppb
  • SO2: 0.1 ppb
  • CO: 0.16 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 0.96 µg/m³
  • PM10: 1 µg/m³
  • O3: 0.021 ppm
  • NO2: 1.9 ppb
  • SO2: 0.1 ppb
  • CO: 0.16 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 0.96 µg/m³
  • PM10: 1 µg/m³
  • O3: 0.021 ppm
  • NO2: 1.7 ppb
  • SO2: 0.1 ppb
  • CO: 0.16 ppm

Health Recommendations:

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