Hourly Weather | Today Wednesday, August 12, 2026
Active Weather Warnings
Watertown, South Dakota
8 AM
Cloudy Weather
70°
Feels Like 72°
0
Humidity: 90%
UV Index: 2
Wind: 6 mph
9 AM
Cloudy Weather
72°
Feels Like 77°
0
Humidity: 85%
UV Index: 3
Wind: 7 mph
10 AM
Cloudy Weather
75°
Feels Like 81°
0
Humidity: 79%
UV Index: 4
Wind: 8 mph
11 AM
Cloudy Weather
77°
Feels Like 84°
0
Humidity: 73%
UV Index: 5
Wind: 8 mph
12 PM
Cloudy Weather
77°
Feels Like 86°
0
Humidity: 68%
UV Index: 7
Wind: 8 mph
1 PM
Cloudy Weather
79°
Feels Like 88°
1
Humidity: 65%
UV Index: 8
Wind: 8 mph
2 PM
Cloudy Weather
81°
Feels Like 88°
5
Humidity: 61%
UV Index: 7
Wind: 8 mph
3 PM
Cloudy Weather
81°
Feels Like 86°
5
Humidity: 59%
UV Index: 5
Wind: 8 mph
4 PM
Cloudy Weather
82°
Feels Like 84°
6
Humidity: 58%
UV Index: 2
Wind: 8 mph
5 PM
Cloudy Weather
84°
Feels Like 86°
7
Humidity: 57%
UV Index: 1
Wind: 8 mph
6 PM
Cloudy Weather
81°
Feels Like 82°
7
Humidity: 63%
UV Index: 1
Wind: 8 mph
7 PM
Cloudy Weather
79°
Feels Like 81°
11
Humidity: 69%
UV Index: 0
Wind: 7 mph
8 PM
Cloudy Weather
77°
Feels Like 77°
19
Humidity: 72%
UV Index: 0
Wind: 8 mph
9 PM
Cloudy Weather
75°
Feels Like 75°
19
Humidity: 79%
UV Index: 0
Wind: 7 mph
10 PM
Cloudy Weather
73°
Feels Like 73°
24
Humidity: 84%
UV Index: 0
Wind: 7 mph
11 PM
Stormy Weather
72°
Feels Like 68°
51
Humidity: 87%
UV Index: 0
Wind: 7 mph

Hourly Air Quality Forecast - AQI (US EPA)

8 AM
19 AQI
Good air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 4.55 µg/m³
  • PM10: 4.7 µg/m³
  • O3: 0.012 ppm
  • NO2: 1.6 ppb
  • SO2: 0 ppb
  • CO: 0.13 ppm

Health Recommendations:

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

9 AM
18 AQI
Good air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 4.34 µg/m³
  • PM10: 4.48 µg/m³
  • O3: 0.013 ppm
  • NO2: 1.7 ppb
  • SO2: 0 ppb
  • CO: 0.13 ppm

Health Recommendations:

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

10 AM
18 AQI
Good air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 4.23 µg/m³
  • PM10: 4.36 µg/m³
  • O3: 0.015 ppm
  • NO2: 1.5 ppb
  • SO2: 0 ppb
  • CO: 0.13 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: 5.36 µg/m³
  • PM10: 5.46 µg/m³
  • O3: 0.037 ppm
  • NO2: 0.6 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
40 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 6.2 µg/m³
  • PM10: 6.29 µg/m³
  • O3: 0.043 ppm
  • NO2: 0.4 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
40 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 6.66 µg/m³
  • PM10: 6.76 µg/m³
  • O3: 0.043 ppm
  • NO2: 0.3 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
40 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 6.96 µg/m³
  • PM10: 7.07 µg/m³
  • O3: 0.043 ppm
  • NO2: 0.3 ppb
  • SO2: 0 ppb
  • CO: 0.13 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 6.99 µg/m³
  • PM10: 7.11 µg/m³
  • O3: 0.042 ppm
  • NO2: 0.4 ppb
  • SO2: 0 ppb
  • CO: 0.13 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 6.84 µg/m³
  • PM10: 6.98 µg/m³
  • O3: 0.040 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.

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

Pollutant Concentrations:

  • PM2.5: 6.74 µg/m³
  • PM10: 6.89 µg/m³
  • O3: 0.038 ppm
  • NO2: 0.7 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
32 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 6.63 µg/m³
  • PM10: 6.8 µg/m³
  • O3: 0.035 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.

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

Pollutant Concentrations:

  • PM2.5: 6.5 µg/m³
  • PM10: 6.67 µg/m³
  • O3: 0.032 ppm
  • NO2: 1.2 ppb
  • SO2: 0 ppb
  • CO: 0.13 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 6.33 µg/m³
  • PM10: 6.47 µg/m³
  • O3: 0.031 ppm
  • NO2: 1.3 ppb
  • SO2: 0 ppb
  • CO: 0.13 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 6.29 µg/m³
  • PM10: 6.39 µg/m³
  • O3: 0.031 ppm
  • NO2: 1.3 ppb
  • SO2: 0.1 ppb
  • CO: 0.13 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 6.44 µg/m³
  • PM10: 6.52 µg/m³
  • O3: 0.031 ppm
  • NO2: 1.2 ppb
  • SO2: 0.1 ppb
  • CO: 0.13 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 6.57 µg/m³
  • PM10: 6.63 µg/m³
  • O3: 0.030 ppm
  • NO2: 1.1 ppb
  • SO2: 0.1 ppb
  • CO: 0.13 ppm

Health Recommendations:

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

Weather Alerts and Warnings for Watertown

Moderate Expected Observed

Special Weather Statement

Special Weather Statement issued August 12 at 7:15AM CDT by NWS Aberdeen SD
Aug 12, 7:15 AM Aug 12, 10:15 AM
Areas of locally dense fog will continue to affect portions of
central and east central South Dakota for the next couple of
hours. If traveling this morning, reduce your speed and use low-
beam headlights when encountering foggy areas.
Updated: Aug 12, 7:22 AM Source: NWS Alert