Hourly Weather | Today Wednesday, March 18, 2026
Waterloo, Iowa
5 AM
Cloudy Weather
21°
Feels Like
20
Frost Risk: 100%
Humidity: 97%
UV Index: 0
Wind: 16 mph
6 AM
Cloudy Night
21°
Feels Like
20
Frost Risk: 100%
Humidity: 95%
UV Index: 0
Wind: 14 mph
7 AM
Cloudy Night
23°
Feels Like
13
Frost Risk: 99%
Humidity: 94%
UV Index: 0
Wind: 12 mph
8 AM
Cloudy Weather
25°
Feels Like 19°
0
Frost Risk: 100%
Humidity: 85%
UV Index: 1
Wind: 7 mph
9 AM
Cloudy Weather
27°
Feels Like 25°
0
Frost Risk: 98%
Humidity: 85%
UV Index: 2
Wind: 7 mph
10 AM
Cloudy Weather
28°
Feels Like 30°
0
Humidity: 82%
UV Index: 3
Wind: 7 mph
11 AM
Sunny Weather
34°
Feels Like 37°
0
Humidity: 75%
UV Index: 4
Wind: 7 mph
12 PM
Cloudy Weather
37°
Feels Like 43°
0
Humidity: 70%
UV Index: 4
Wind: 6 mph
1 PM
Cloudy Weather
41°
Feels Like 46°
0
Humidity: 66%
UV Index: 5
Wind: 6 mph
2 PM
Cloudy Weather
45°
Feels Like 48°
0
Humidity: 63%
UV Index: 4
Wind: 7 mph
3 PM
Cloudy Weather
45°
Feels Like 48°
0
Humidity: 63%
UV Index: 4
Wind: 7 mph
4 PM
Cloudy Weather
46°
Feels Like 46°
0
Humidity: 61%
UV Index: 3
Wind: 7 mph
5 PM
Cloudy Weather
45°
Feels Like 45°
0
Humidity: 66%
UV Index: 2
Wind: 7 mph
6 PM
Cloudy Weather
45°
Feels Like 41°
0
Humidity: 70%
UV Index: 1
Wind: 7 mph
7 PM
Cloudy Weather
43°
Feels Like 37°
0
Humidity: 77%
UV Index: 0
Wind: 7 mph
8 PM
Cloudy Night
41°
Feels Like 37°
1
Humidity: 79%
UV Index: 0
Wind: 6 mph
9 PM
Cloudy Night
39°
Feels Like 37°
1
Humidity: 79%
UV Index: 0
Wind: 6 mph
10 PM
Cloudy Night
39°
Feels Like 37°
1
Humidity: 80%
UV Index: 0
Wind: 5 mph
11 PM
Cloudy Night
37°
Feels Like 37°
1
Humidity: 81%
UV Index: 0
Wind: 5 mph

Hourly Air Quality Forecast - AQI (US EPA)

5 AM
42 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 3.72 µg/m³
  • PM10: 4.01 µg/m³
  • O3: 0.045 ppm
  • NO2: 1.1 ppb
  • SO2: 0.4 ppb
  • CO: 0.14 ppm

Health Recommendations:

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

6 AM
39 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 3.94 µg/m³
  • PM10: 4.34 µg/m³
  • O3: 0.043 ppm
  • NO2: 1.4 ppb
  • SO2: 0.3 ppb
  • CO: 0.14 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 4.22 µg/m³
  • PM10: 4.71 µg/m³
  • O3: 0.040 ppm
  • NO2: 1.7 ppb
  • SO2: 0.2 ppb
  • CO: 0.14 ppm

Health Recommendations:

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

8 AM
34 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 4.5 µg/m³
  • PM10: 5.11 µg/m³
  • O3: 0.037 ppm
  • NO2: 2.5 ppb
  • SO2: 0.2 ppb
  • CO: 0.15 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 4.82 µg/m³
  • PM10: 5.57 µg/m³
  • O3: 0.034 ppm
  • NO2: 3.5 ppb
  • SO2: 0.2 ppb
  • CO: 0.17 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 5.42 µg/m³
  • PM10: 6.3 µg/m³
  • O3: 0.033 ppm
  • NO2: 3.6 ppb
  • SO2: 0.2 ppb
  • CO: 0.18 ppm

Health Recommendations:

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

11 AM
32 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 6.68 µg/m³
  • PM10: 7.67 µg/m³
  • O3: 0.034 ppm
  • NO2: 3.5 ppb
  • SO2: 0.2 ppb
  • CO: 0.19 ppm

Health Recommendations:

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

12 PM
37 AQI
Good air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 8.83 µg/m³
  • PM10: 9.93 µg/m³
  • O3: 0.037 ppm
  • NO2: 3.3 ppb
  • SO2: 0.2 ppb
  • CO: 0.20 ppm

Health Recommendations:

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

1 PM
50 AQI
Good air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 12.19 µg/m³
  • PM10: 13.38 µg/m³
  • O3: 0.040 ppm
  • NO2: 3.4 ppb
  • SO2: 0.3 ppb
  • CO: 0.20 ppm

Health Recommendations:

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

2 PM
60 AQI
Moderate air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 16.82 µg/m³
  • PM10: 18.14 µg/m³
  • O3: 0.044 ppm
  • NO2: 3.7 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.

3 PM
69 AQI
Moderate air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 20.89 µg/m³
  • PM10: 22.27 µg/m³
  • O3: 0.048 ppm
  • NO2: 4 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.

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

Pollutant Concentrations:

  • PM2.5: 23.54 µg/m³
  • PM10: 24.94 µg/m³
  • O3: 0.050 ppm
  • NO2: 4.3 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.

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

Pollutant Concentrations:

  • PM2.5: 25.62 µg/m³
  • PM10: 27.06 µg/m³
  • O3: 0.053 ppm
  • NO2: 4.8 ppb
  • SO2: 0.4 ppb
  • CO: 0.22 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 26.38 µg/m³
  • PM10: 27.8 µg/m³
  • O3: 0.052 ppm
  • NO2: 5.5 ppb
  • SO2: 0.3 ppb
  • CO: 0.22 ppm

Health Recommendations:

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

7 PM
78 AQI
Moderate air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 25.19 µg/m³
  • PM10: 26.53 µg/m³
  • O3: 0.050 ppm
  • NO2: 5.9 ppb
  • SO2: 0.3 ppb
  • CO: 0.22 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 22.07 µg/m³
  • PM10: 23.23 µg/m³
  • O3: 0.046 ppm
  • NO2: 5 ppb
  • SO2: 0.2 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.

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

Pollutant Concentrations:

  • PM2.5: 18.98 µg/m³
  • PM10: 20.02 µg/m³
  • O3: 0.044 ppm
  • NO2: 4.2 ppb
  • SO2: 0.1 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.

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

Pollutant Concentrations:

  • PM2.5: 16.4 µg/m³
  • PM10: 17.35 µg/m³
  • O3: 0.042 ppm
  • NO2: 3.6 ppb
  • SO2: 0.1 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.

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

Pollutant Concentrations:

  • PM2.5: 14.27 µg/m³
  • PM10: 15.15 µg/m³
  • O3: 0.042 ppm
  • NO2: 3 ppb
  • SO2: 0.1 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.