Hourly Weather | Today Monday, September 21, 2026
Rapid City, South Dakota
1 PM
Cloudy Weather
55°
Feels Like 54°
49
Humidity: 89%
UV Index: 1
Wind: 9 mph
2 PM
Cloudy Weather
57°
Feels Like 55°
34
Humidity: 86%
UV Index: 2
Wind: 9 mph
3 PM
Cloudy Weather
57°
Feels Like 55°
34
Humidity: 83%
UV Index: 2
Wind: 9 mph
4 PM
Cloudy Weather
59°
Feels Like 57°
40
Humidity: 79%
UV Index: 1
Wind: 10 mph
5 PM
Partly Sunny with Showers
57°
Feels Like 54°
51
Humidity: 83%
UV Index: 1
Wind: 10 mph
6 PM
Cloudy Weather
57°
Feels Like 54°
47
Humidity: 85%
UV Index: 0
Wind: 10 mph
7 PM
Cloudy Night
55°
Feels Like 52°
36
Humidity: 88%
UV Index: 0
Wind: 10 mph
8 PM
Cloudy Weather
55°
Feels Like 52°
20
Humidity: 87%
UV Index: 0
Wind: 10 mph
9 PM
Cloudy Weather
54°
Feels Like 48°
20
Humidity: 92%
UV Index: 0
Wind: 10 mph
10 PM
Cloudy Weather
54°
Feels Like 48°
20
Humidity: 92%
UV Index: 0
Wind: 10 mph
11 PM
Cloudy Weather
54°
Feels Like 48°
20
Humidity: 92%
UV Index: 0
Wind: 10 mph

Hourly Air Quality Forecast - AQI (US EPA)

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

Pollutant Concentrations:

  • PM2.5: 0.89 µg/m³
  • PM10: 1.65 µg/m³
  • O3: 0.027 ppm
  • NO2: 0.2 ppb
  • SO2: 0 ppb
  • CO: 0.12 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 0.87 µg/m³
  • PM10: 1.52 µg/m³
  • O3: 0.028 ppm
  • NO2: 0.2 ppb
  • SO2: 0 ppb
  • CO: 0.12 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 0.88 µg/m³
  • PM10: 1.47 µg/m³
  • O3: 0.028 ppm
  • NO2: 0.2 ppb
  • SO2: 0 ppb
  • CO: 0.12 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 0.93 µg/m³
  • PM10: 1.48 µg/m³
  • O3: 0.029 ppm
  • NO2: 0.2 ppb
  • SO2: 0 ppb
  • CO: 0.12 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 0.94 µg/m³
  • PM10: 1.42 µg/m³
  • O3: 0.030 ppm
  • NO2: 0.2 ppb
  • SO2: 0 ppb
  • CO: 0.12 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 0.84 µg/m³
  • PM10: 1.23 µg/m³
  • O3: 0.030 ppm
  • NO2: 0.3 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
28 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 0.7 µg/m³
  • PM10: 1.02 µg/m³
  • O3: 0.030 ppm
  • NO2: 0.4 ppb
  • SO2: 0 ppb
  • CO: 0.12 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 0.62 µg/m³
  • PM10: 0.89 µg/m³
  • O3: 0.030 ppm
  • NO2: 0.5 ppb
  • SO2: 0 ppb
  • CO: 0.12 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 0.59 µg/m³
  • PM10: 0.84 µg/m³
  • O3: 0.030 ppm
  • NO2: 0.5 ppb
  • SO2: 0 ppb
  • CO: 0.12 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 0.61 µg/m³
  • PM10: 0.81 µg/m³
  • O3: 0.028 ppm
  • NO2: 0.6 ppb
  • SO2: 0 ppb
  • CO: 0.12 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 0.64 µg/m³
  • PM10: 0.81 µg/m³
  • O3: 0.028 ppm
  • NO2: 0.6 ppb
  • SO2: 0 ppb
  • CO: 0.12 ppm

Health Recommendations:

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