Hourly Weather | Today Wednesday, March 18, 2026
Brookings, South Dakota
6 AM
Cloudy Night
23°
Feels Like 21°
0
Frost Risk: 100%
Humidity: 98%
UV Index: 0
Wind: 4 mph
7 AM
Cloudy Night
25°
Feels Like 23°
0
Frost Risk: 100%
Humidity: 96%
UV Index: 0
Wind: 4 mph
8 AM
Cloudy Weather
27°
Feels Like 28°
0
Frost Risk: 96%
Humidity: 94%
UV Index: 1
Wind: 4 mph
9 AM
Cloudy Weather
30°
Feels Like 34°
0
Humidity: 85%
UV Index: 1
Wind: 4 mph
10 AM
Cloudy Weather
34°
Feels Like 37°
0
Humidity: 85%
UV Index: 2
Wind: 4 mph
11 AM
Cloudy Weather
37°
Feels Like 43°
0
Humidity: 79%
UV Index: 3
Wind: 6 mph
12 PM
Cloudy Weather
41°
Feels Like 46°
0
Humidity: 75%
UV Index: 3
Wind: 6 mph
1 PM
Cloudy Weather
45°
Feels Like 48°
0
Humidity: 71%
UV Index: 4
Wind: 7 mph
2 PM
Cloudy Weather
46°
Feels Like 48°
0
Humidity: 68%
UV Index: 3
Wind: 7 mph
3 PM
Cloudy Weather
48°
Feels Like 48°
0
Humidity: 66%
UV Index: 3
Wind: 9 mph
4 PM
Cloudy Weather
50°
Feels Like 48°
0
Humidity: 61%
UV Index: 1
Wind: 9 mph
5 PM
Cloudy Weather
48°
Feels Like 45°
0
Humidity: 66%
UV Index: 1
Wind: 9 mph
6 PM
Cloudy Weather
46°
Feels Like 43°
0
Humidity: 70%
UV Index: 0
Wind: 8 mph
7 PM
Cloudy Weather
45°
Feels Like 41°
0
Humidity: 76%
UV Index: 0
Wind: 7 mph
8 PM
Cloudy Night
43°
Feels Like 39°
0
Humidity: 81%
UV Index: 0
Wind: 6 mph
9 PM
Cloudy Night
41°
Feels Like 39°
0
Humidity: 86%
UV Index: 0
Wind: 4 mph
10 PM
Cloudy Night
37°
Feels Like 39°
0
Humidity: 90%
UV Index: 0
Wind: 4 mph
11 PM
Cloudy Night
36°
Feels Like 36°
0
Humidity: 92%
UV Index: 0
Wind: 4 mph

Hourly Air Quality Forecast - AQI (US EPA)

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

Pollutant Concentrations:

  • PM2.5: 0.96 µg/m³
  • PM10: 1.59 µg/m³
  • O3: 0.036 ppm
  • NO2: 0.9 ppb
  • SO2: 0 ppb
  • CO: 0.12 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 0.84 µg/m³
  • PM10: 1.54 µg/m³
  • O3: 0.037 ppm
  • NO2: 0.8 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
34 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 0.81 µg/m³
  • PM10: 1.56 µg/m³
  • O3: 0.037 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.

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

Pollutant Concentrations:

  • PM2.5: 0.83 µg/m³
  • PM10: 1.63 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.

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

Pollutant Concentrations:

  • PM2.5: 0.88 µg/m³
  • PM10: 1.71 µg/m³
  • O3: 0.036 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.

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

Pollutant Concentrations:

  • PM2.5: 1.06 µg/m³
  • PM10: 1.89 µg/m³
  • O3: 0.036 ppm
  • NO2: 1 ppb
  • SO2: 0 ppb
  • CO: 0.13 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 2.03 µg/m³
  • PM10: 2.89 µg/m³
  • O3: 0.037 ppm
  • NO2: 0.9 ppb
  • SO2: 0 ppb
  • CO: 0.13 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 4.04 µg/m³
  • PM10: 4.95 µg/m³
  • O3: 0.039 ppm
  • NO2: 0.8 ppb
  • SO2: 0 ppb
  • CO: 0.13 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 6.23 µg/m³
  • PM10: 7.19 µg/m³
  • O3: 0.044 ppm
  • NO2: 0.8 ppb
  • SO2: 0 ppb
  • CO: 0.14 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 7.48 µg/m³
  • PM10: 8.46 µg/m³
  • O3: 0.047 ppm
  • NO2: 0.9 ppb
  • SO2: 0 ppb
  • CO: 0.14 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 7.73 µg/m³
  • PM10: 8.73 µg/m³
  • O3: 0.049 ppm
  • NO2: 1 ppb
  • SO2: 0 ppb
  • CO: 0.14 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 7.02 µg/m³
  • PM10: 8.06 µg/m³
  • O3: 0.049 ppm
  • NO2: 1.6 ppb
  • SO2: 0 ppb
  • CO: 0.14 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 5.2 µg/m³
  • PM10: 6.22 µg/m³
  • O3: 0.045 ppm
  • NO2: 2.3 ppb
  • SO2: 0 ppb
  • CO: 0.15 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 3.09 µg/m³
  • PM10: 4.05 µg/m³
  • O3: 0.040 ppm
  • NO2: 3.1 ppb
  • SO2: 0 ppb
  • CO: 0.15 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 1.87 µg/m³
  • PM10: 2.75 µg/m³
  • O3: 0.035 ppm
  • NO2: 3.4 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
29 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 1.64 µg/m³
  • PM10: 2.45 µg/m³
  • O3: 0.031 ppm
  • NO2: 3.5 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
27 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 1.46 µg/m³
  • PM10: 2.2 µg/m³
  • O3: 0.029 ppm
  • NO2: 3.5 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
25 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 1.32 µg/m³
  • PM10: 1.99 µg/m³
  • O3: 0.027 ppm
  • NO2: 3.3 ppb
  • SO2: 0 ppb
  • CO: 0.15 ppm

Health Recommendations:

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