Hourly Weather | Today Wednesday, March 18, 2026
Sioux City, Iowa
7 AM
Cloudy Night
27°
Feels Like 21°
0
Frost Risk: 90%
Humidity: 92%
UV Index: 0
Wind: 7 mph
8 AM
Sunny Weather
27°
Feels Like 25°
0
Frost Risk: 100%
Humidity: 100%
UV Index: 1
Wind: 6 mph
9 AM
Cloudy Weather
28°
Feels Like 28°
0
Frost Risk: 100%
Humidity: 99%
UV Index: 2
Wind: 6 mph
10 AM
Sunny Weather
36°
Feels Like 36°
0
Humidity: 93%
UV Index: 3
Wind: 7 mph
11 AM
Sunny Weather
41°
Feels Like 45°
0
Humidity: 83%
UV Index: 4
Wind: 7 mph
12 PM
Sunny Weather
48°
Feels Like 52°
0
Humidity: 69%
UV Index: 4
Wind: 7 mph
1 PM
Cloudy Weather
54°
Feels Like 59°
0
Humidity: 58%
UV Index: 5
Wind: 7 mph
2 PM
Cloudy Weather
57°
Feels Like 63°
0
Humidity: 52%
UV Index: 4
Wind: 7 mph
3 PM
Cloudy Weather
61°
Feels Like 64°
0
Humidity: 48%
UV Index: 4
Wind: 8 mph
4 PM
Cloudy Weather
63°
Feels Like 64°
0
Humidity: 47%
UV Index: 3
Wind: 8 mph
5 PM
Cloudy Weather
64°
Feels Like 64°
0
Humidity: 46%
UV Index: 1
Wind: 8 mph
6 PM
Cloudy Weather
63°
Feels Like 61°
0
Humidity: 53%
UV Index: 1
Wind: 7 mph
7 PM
Cloudy Weather
59°
Feels Like 57°
0
Humidity: 60%
UV Index: 0
Wind: 6 mph
8 PM
Cloudy Night
55°
Feels Like 54°
0
Humidity: 65%
UV Index: 0
Wind: 6 mph
9 PM
Cloudy Night
52°
Feels Like 50°
0
Humidity: 71%
UV Index: 0
Wind: 6 mph
10 PM
Cloudy Night
48°
Feels Like 46°
0
Humidity: 75%
UV Index: 0
Wind: 6 mph
11 PM
Cloudy Night
46°
Feels Like 45°
0
Humidity: 80%
UV Index: 0
Wind: 6 mph

Hourly Air Quality Forecast - AQI (US EPA)

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

Pollutant Concentrations:

  • PM2.5: 0.76 µg/m³
  • PM10: 1.57 µg/m³
  • O3: 0.036 ppm
  • NO2: 0.9 ppb
  • SO2: 0 ppb
  • CO: 0.11 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 0.73 µg/m³
  • PM10: 1.62 µg/m³
  • O3: 0.036 ppm
  • NO2: 1 ppb
  • SO2: 0 ppb
  • CO: 0.11 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 0.74 µg/m³
  • PM10: 1.71 µg/m³
  • O3: 0.035 ppm
  • NO2: 1.3 ppb
  • SO2: 0 ppb
  • CO: 0.12 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 0.78 µg/m³
  • PM10: 1.78 µg/m³
  • O3: 0.036 ppm
  • NO2: 1.2 ppb
  • SO2: 0 ppb
  • CO: 0.12 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 0.83 µg/m³
  • PM10: 1.83 µg/m³
  • O3: 0.037 ppm
  • NO2: 1.1 ppb
  • SO2: 0 ppb
  • CO: 0.12 ppm

Health Recommendations:

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

12 PM
35 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 0.97 µg/m³
  • PM10: 1.91 µg/m³
  • O3: 0.038 ppm
  • NO2: 0.8 ppb
  • SO2: 0 ppb
  • CO: 0.12 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 1.23 µg/m³
  • PM10: 2.09 µg/m³
  • O3: 0.040 ppm
  • NO2: 0.6 ppb
  • SO2: 0 ppb
  • CO: 0.11 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 1.12 µg/m³
  • PM10: 2.03 µg/m³
  • O3: 0.046 ppm
  • NO2: 0.3 ppb
  • SO2: 0 ppb
  • CO: 0.11 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 1.1 µg/m³
  • PM10: 2 µg/m³
  • O3: 0.047 ppm
  • NO2: 0.3 ppb
  • SO2: 0 ppb
  • CO: 0.10 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 1.18 µg/m³
  • PM10: 2 µg/m³
  • O3: 0.047 ppm
  • NO2: 0.3 ppb
  • SO2: 0 ppb
  • CO: 0.10 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 1.27 µg/m³
  • PM10: 2.13 µg/m³
  • O3: 0.045 ppm
  • NO2: 0.7 ppb
  • SO2: 0 ppb
  • CO: 0.11 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 1.37 µg/m³
  • PM10: 2.39 µg/m³
  • O3: 0.039 ppm
  • NO2: 1.7 ppb
  • SO2: 0 ppb
  • CO: 0.12 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 1.48 µg/m³
  • PM10: 2.68 µg/m³
  • O3: 0.035 ppm
  • NO2: 3 ppb
  • SO2: 0 ppb
  • CO: 0.14 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 1.6 µg/m³
  • PM10: 2.94 µg/m³
  • O3: 0.033 ppm
  • NO2: 3.8 ppb
  • SO2: 0 ppb
  • CO: 0.15 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 1.69 µg/m³
  • PM10: 3 µg/m³
  • O3: 0.032 ppm
  • NO2: 4 ppb
  • SO2: 0 ppb
  • CO: 0.15 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 1.73 µg/m³
  • PM10: 2.89 µg/m³
  • O3: 0.032 ppm
  • NO2: 4 ppb
  • SO2: 0 ppb
  • CO: 0.15 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 1.74 µg/m³
  • PM10: 2.72 µg/m³
  • O3: 0.031 ppm
  • NO2: 3.8 ppb
  • SO2: 0 ppb
  • CO: 0.15 ppm

Health Recommendations:

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