Hourly Weather | Today Tuesday, September 1, 2026
Watertown, South Dakota
11 AM
Cloudy Weather
66°
Feels Like 70°
7
Humidity: 77%
UV Index: 4
Wind: 7 mph
12 PM
Cloudy Weather
70°
Feels Like 75°
7
Humidity: 61%
UV Index: 4
Wind: 7 mph
1 PM
Cloudy Weather
75°
Feels Like 77°
11
Humidity: 51%
UV Index: 3
Wind: 6 mph
2 PM
Cloudy Weather
79°
Feels Like 81°
19
Humidity: 45%
UV Index: 2
Wind: 6 mph
3 PM
Cloudy Weather
79°
Feels Like 79°
19
Humidity: 47%
UV Index: 2
Wind: 6 mph
4 PM
Cloudy Weather
77°
Feels Like 77°
24
Humidity: 51%
UV Index: 1
Wind: 4 mph
5 PM
Stormy Weather
75°
Feels Like 72°
51
Humidity: 59%
UV Index: 1
Wind: 6 mph
6 PM
Cloudy Weather
75°
Feels Like 73°
47
Humidity: 59%
UV Index: 1
Wind: 6 mph
7 PM
Cloudy Weather
73°
Feels Like 72°
49
Humidity: 62%
UV Index: 0
Wind: 7 mph
8 PM
Stormy Weather
72°
Feels Like 68°
64
Humidity: 66%
UV Index: 0
Wind: 6 mph
9 PM
Cloudy Weather
70°
Feels Like 68°
49
Humidity: 72%
UV Index: 0
Wind: 6 mph
10 PM
Stormy Weather
68°
Feels Like 64°
64
Humidity: 75%
UV Index: 0
Wind: 6 mph
11 PM
Cloudy Weather
66°
Feels Like 64°
40
Humidity: 79%
UV Index: 0
Wind: 6 mph

Hourly Air Quality Forecast - AQI (US EPA)

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

Pollutant Concentrations:

  • PM2.5: 2.94 µg/m³
  • PM10: 3.16 µg/m³
  • O3: 0.027 ppm
  • NO2: 1.7 ppb
  • SO2: 0 ppb
  • CO: 0.11 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 3.01 µg/m³
  • PM10: 3.23 µg/m³
  • O3: 0.029 ppm
  • NO2: 1.4 ppb
  • SO2: 0 ppb
  • CO: 0.11 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 3.39 µg/m³
  • PM10: 3.61 µg/m³
  • O3: 0.030 ppm
  • NO2: 1.1 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
28 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 4.04 µg/m³
  • PM10: 4.25 µg/m³
  • O3: 0.030 ppm
  • NO2: 1.2 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
26 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 4.69 µg/m³
  • PM10: 4.89 µg/m³
  • O3: 0.028 ppm
  • NO2: 1.4 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
25 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 5.2 µg/m³
  • PM10: 5.38 µg/m³
  • O3: 0.027 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.

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

Pollutant Concentrations:

  • PM2.5: 5.26 µg/m³
  • PM10: 5.44 µg/m³
  • O3: 0.026 ppm
  • NO2: 2.2 ppb
  • SO2: 0 ppb
  • CO: 0.13 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: 5.01 µg/m³
  • PM10: 5.19 µg/m³
  • O3: 0.025 ppm
  • NO2: 2.6 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
25 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 4.51 µg/m³
  • PM10: 4.68 µg/m³
  • O3: 0.027 ppm
  • NO2: 2.4 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: 4.05 µg/m³
  • PM10: 4.18 µg/m³
  • O3: 0.031 ppm
  • NO2: 1.9 ppb
  • SO2: 0.1 ppb
  • CO: 0.12 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: 3.96 µg/m³
  • PM10: 4.07 µg/m³
  • O3: 0.031 ppm
  • NO2: 1.8 ppb
  • SO2: 0.1 ppb
  • CO: 0.12 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 3.81 µg/m³
  • PM10: 3.88 µg/m³
  • O3: 0.031 ppm
  • NO2: 1.7 ppb
  • SO2: 0.1 ppb
  • CO: 0.11 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 3.47 µg/m³
  • PM10: 3.53 µg/m³
  • O3: 0.030 ppm
  • NO2: 1.4 ppb
  • SO2: 0.1 ppb
  • CO: 0.11 ppm

Health Recommendations:

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