Hourly Weather | Today Monday, September 21, 2026
Sioux City, Iowa
3 PM
Cloudy Weather
57°
Feels Like 57°
49
Humidity: 86%
UV Index: 1
Wind: 8 mph
4 PM
Cloudy Weather
57°
Feels Like 55°
49
Humidity: 89%
UV Index: 1
Wind: 8 mph
5 PM
Rainy Weather
57°
Feels Like 52°
55
Humidity: 89%
UV Index: 0
Wind: 8 mph
6 PM
Cloudy Weather
57°
Feels Like 54°
49
Humidity: 89%
UV Index: 0
Wind: 8 mph
7 PM
Cloudy Weather
55°
Feels Like 54°
38
Humidity: 89%
UV Index: 0
Wind: 8 mph
8 PM
Cloudy Weather
57°
Feels Like 54°
20
Humidity: 84%
UV Index: 0
Wind: 8 mph
9 PM
Cloudy Weather
55°
Feels Like 54°
20
Humidity: 87%
UV Index: 0
Wind: 7 mph
10 PM
Cloudy Weather
55°
Feels Like 54°
20
Humidity: 87%
UV Index: 0
Wind: 7 mph
11 PM
Cloudy Weather
55°
Feels Like 54°
20
Humidity: 88%
UV Index: 0
Wind: 6 mph

Hourly Air Quality Forecast - AQI (US EPA)

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

Pollutant Concentrations:

  • PM2.5: 1.69 µg/m³
  • PM10: 1.76 µg/m³
  • O3: 0.025 ppm
  • NO2: 1.2 ppb
  • SO2: 0.2 ppb
  • CO: 0.14 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: 1.8 µg/m³
  • PM10: 1.87 µg/m³
  • O3: 0.025 ppm
  • NO2: 1.2 ppb
  • SO2: 0.2 ppb
  • CO: 0.15 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: 1.84 µg/m³
  • PM10: 1.92 µg/m³
  • O3: 0.025 ppm
  • NO2: 1.3 ppb
  • SO2: 0.3 ppb
  • CO: 0.15 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 1.78 µg/m³
  • PM10: 1.86 µg/m³
  • O3: 0.026 ppm
  • NO2: 1.5 ppb
  • SO2: 0.3 ppb
  • CO: 0.15 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 1.67 µg/m³
  • PM10: 1.74 µg/m³
  • O3: 0.026 ppm
  • NO2: 1.8 ppb
  • SO2: 0.4 ppb
  • CO: 0.15 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 1.53 µg/m³
  • PM10: 1.61 µg/m³
  • O3: 0.026 ppm
  • NO2: 1.8 ppb
  • SO2: 0.5 ppb
  • CO: 0.15 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: 1.41 µg/m³
  • PM10: 1.52 µg/m³
  • O3: 0.025 ppm
  • NO2: 1.7 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 PM
23 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 1.33 µg/m³
  • PM10: 1.47 µg/m³
  • O3: 0.024 ppm
  • NO2: 1.5 ppb
  • SO2: 0.6 ppb
  • CO: 0.15 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 1.21 µg/m³
  • PM10: 1.35 µg/m³
  • O3: 0.023 ppm
  • NO2: 1.4 ppb
  • SO2: 0.7 ppb
  • CO: 0.15 ppm

Health Recommendations:

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