Hourly Weather | Today Thursday, May 21, 2026
Waterbury, Connecticut
6 AM
Cloudy Weather
57°
Feels Like 55°
34
Humidity: 67%
UV Index: 0
Wind: 6 mph
7 AM
Cloudy Weather
57°
Feels Like 55°
40
Humidity: 68%
UV Index: 1
Wind: 7 mph
8 AM
Rainy Weather
57°
Feels Like 54°
61
Humidity: 66%
UV Index: 1
Wind: 7 mph
9 AM
Rainy Weather
57°
Feels Like 54°
61
Humidity: 71%
UV Index: 1
Wind: 7 mph
10 AM
Cloudy Weather
57°
Feels Like 59°
49
Humidity: 70%
UV Index: 2
Wind: 7 mph
11 AM
Cloudy Weather
59°
Feels Like 61°
34
Humidity: 68%
UV Index: 2
Wind: 7 mph
12 PM
Cloudy Weather
61°
Feels Like 64°
34
Humidity: 64%
UV Index: 3
Wind: 6 mph
1 PM
Cloudy Weather
61°
Feels Like 66°
24
Humidity: 59%
UV Index: 4
Wind: 6 mph
2 PM
Cloudy Weather
63°
Feels Like 66°
4
Humidity: 56%
UV Index: 4
Wind: 6 mph
3 PM
Cloudy Weather
63°
Feels Like 66°
4
Humidity: 55%
UV Index: 3
Wind: 5 mph
4 PM
Cloudy Weather
63°
Feels Like 64°
4
Humidity: 56%
UV Index: 2
Wind: 5 mph
5 PM
Cloudy Weather
63°
Feels Like 64°
4
Humidity: 55%
UV Index: 2
Wind: 5 mph
6 PM
Cloudy Weather
61°
Feels Like 63°
4
Humidity: 58%
UV Index: 1
Wind: 5 mph
7 PM
Cloudy Weather
61°
Feels Like 63°
2
Humidity: 60%
UV Index: 1
Wind: 4 mph
8 PM
Cloudy Weather
59°
Feels Like 61°
0
Humidity: 64%
UV Index: 0
Wind: 4 mph
9 PM
Cloudy Night
59°
Feels Like 61°
0
Humidity: 65%
UV Index: 0
Wind: 2 mph
10 PM
Cloudy Night
59°
Feels Like 61°
0
Humidity: 65%
UV Index: 0
Wind: 2 mph
11 PM
Cloudy Night
57°
Feels Like 59°
0
Humidity: 65%
UV Index: 0
Wind: 2 mph

Hourly Air Quality Forecast - AQI (US EPA)

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

Pollutant Concentrations:

  • PM2.5: 2.24 µg/m³
  • PM10: 3.36 µg/m³
  • O3: 0.031 ppm
  • NO2: 6.6 ppb
  • SO2: 1.6 ppb
  • CO: 0.13 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 2.46 µg/m³
  • PM10: 3.55 µg/m³
  • O3: 0.031 ppm
  • NO2: 7.7 ppb
  • SO2: 1.6 ppb
  • CO: 0.14 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 2.72 µg/m³
  • PM10: 3.95 µg/m³
  • O3: 0.029 ppm
  • NO2: 9.9 ppb
  • SO2: 1.6 ppb
  • CO: 0.15 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 2.76 µg/m³
  • PM10: 3.92 µg/m³
  • O3: 0.026 ppm
  • NO2: 10.9 ppb
  • SO2: 1.5 ppb
  • CO: 0.15 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 2.72 µg/m³
  • PM10: 3.84 µg/m³
  • O3: 0.026 ppm
  • NO2: 10.8 ppb
  • SO2: 1.4 ppb
  • CO: 0.16 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 2.68 µg/m³
  • PM10: 3.83 µg/m³
  • O3: 0.026 ppm
  • NO2: 10.1 ppb
  • SO2: 1.4 ppb
  • CO: 0.16 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 2.72 µg/m³
  • PM10: 3.89 µg/m³
  • O3: 0.027 ppm
  • NO2: 9.1 ppb
  • SO2: 1.4 ppb
  • CO: 0.16 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 2.9 µg/m³
  • PM10: 4.08 µg/m³
  • O3: 0.029 ppm
  • NO2: 8.2 ppb
  • SO2: 1.4 ppb
  • CO: 0.16 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 3.25 µg/m³
  • PM10: 4.38 µg/m³
  • O3: 0.032 ppm
  • NO2: 7.2 ppb
  • SO2: 1.4 ppb
  • CO: 0.16 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 3.7 µg/m³
  • PM10: 4.75 µg/m³
  • O3: 0.036 ppm
  • NO2: 6.1 ppb
  • SO2: 1.3 ppb
  • CO: 0.15 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 4.07 µg/m³
  • PM10: 5.07 µg/m³
  • O3: 0.039 ppm
  • NO2: 5.5 ppb
  • SO2: 1.3 ppb
  • CO: 0.15 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 4.07 µg/m³
  • PM10: 5.02 µg/m³
  • O3: 0.041 ppm
  • NO2: 5.3 ppb
  • SO2: 1.2 ppb
  • CO: 0.15 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 4.01 µg/m³
  • PM10: 5.02 µg/m³
  • O3: 0.041 ppm
  • NO2: 5.4 ppb
  • SO2: 1.2 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: 4.08 µg/m³
  • PM10: 5.31 µg/m³
  • O3: 0.040 ppm
  • NO2: 6.4 ppb
  • SO2: 1.3 ppb
  • CO: 0.15 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 4.12 µg/m³
  • PM10: 5.58 µg/m³
  • O3: 0.038 ppm
  • NO2: 7.7 ppb
  • SO2: 1.3 ppb
  • CO: 0.16 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 4.18 µg/m³
  • PM10: 5.99 µg/m³
  • O3: 0.035 ppm
  • NO2: 8.5 ppb
  • SO2: 1.3 ppb
  • CO: 0.16 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: 4.38 µg/m³
  • PM10: 6.67 µg/m³
  • O3: 0.033 ppm
  • NO2: 9.5 ppb
  • SO2: 1.2 ppb
  • CO: 0.17 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: 4.63 µg/m³
  • PM10: 7.19 µg/m³
  • O3: 0.031 ppm
  • NO2: 10.2 ppb
  • SO2: 1.1 ppb
  • CO: 0.18 ppm

Health Recommendations:

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