Hourly Weather | Today Tuesday, July 21, 2026
Norwalk, Connecticut
5 AM
Cloudy Night
64°
Feels Like 64°
1
Humidity: 100%
UV Index: 0
Wind: 6 mph
6 AM
Cloudy Weather
66°
Feels Like 66°
1
Humidity: 98%
UV Index: 0
Wind: 7 mph
7 AM
Cloudy Weather
68°
Feels Like 70°
4
Humidity: 94%
UV Index: 1
Wind: 7 mph
8 AM
Cloudy Weather
72°
Feels Like 72°
43
Humidity: 86%
UV Index: 1
Wind: 9 mph
9 AM
Cloudy Weather
73°
Feels Like 75°
47
Humidity: 80%
UV Index: 1
Wind: 9 mph
10 AM
Rainy Weather
75°
Feels Like 73°
51
Humidity: 79%
UV Index: 1
Wind: 10 mph
11 AM
Rainy Weather
75°
Feels Like 77°
51
Humidity: 77%
UV Index: 2
Wind: 12 mph
12 PM
Cloudy Weather
77°
Feels Like 81°
47
Humidity: 78%
UV Index: 2
Wind: 12 mph
1 PM
Cloudy Weather
77°
Feels Like 82°
45
Humidity: 81%
UV Index: 3
Wind: 12 mph
2 PM
Cloudy Weather
79°
Feels Like 84°
49
Humidity: 84%
UV Index: 3
Wind: 12 mph
3 PM
Stormy Weather
79°
Feels Like 81°
70
Humidity: 83%
UV Index: 1
Wind: 10 mph
4 PM
Stormy Weather
77°
Feels Like 82°
61
Humidity: 88%
UV Index: 1
Wind: 10 mph
5 PM
Cloudy Weather
75°
Feels Like 82°
49
Humidity: 91%
UV Index: 1
Wind: 9 mph
6 PM
Cloudy Weather
77°
Feels Like 82°
49
Humidity: 90%
UV Index: 1
Wind: 9 mph
7 PM
Stormy Weather
75°
Feels Like 77°
66
Humidity: 92%
UV Index: 0
Wind: 9 mph
8 PM
Cloudy Weather
75°
Feels Like 81°
49
Humidity: 92%
UV Index: 0
Wind: 8 mph
9 PM
Stormy Weather
75°
Feels Like 73°
69
Humidity: 93%
UV Index: 0
Wind: 9 mph
10 PM
Cloudy Weather
73°
Feels Like 77°
49
Humidity: 93%
UV Index: 0
Wind: 9 mph
11 PM
Cloudy Weather
73°
Feels Like 77°
49
Humidity: 92%
UV Index: 0
Wind: 9 mph

Hourly Air Quality Forecast - AQI (US EPA)

5 AM
54 AQI
Moderate air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 9.86 µg/m³
  • PM10: 14.05 µg/m³
  • O3: 0.055 ppm
  • NO2: 0.7 ppb
  • SO2: 0.3 ppb
  • CO: 0.24 ppm

Health Recommendations:

Air quality is acceptable; some pollutants may pose a risk for a small number of unusually sensitive people.

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

Pollutant Concentrations:

  • PM2.5: 9.23 µg/m³
  • PM10: 13.14 µg/m³
  • O3: 0.054 ppm
  • NO2: 0.7 ppb
  • SO2: 0.3 ppb
  • CO: 0.25 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 8.43 µg/m³
  • PM10: 12.15 µg/m³
  • O3: 0.053 ppm
  • NO2: 1 ppb
  • SO2: 0.3 ppb
  • CO: 0.27 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 7.54 µg/m³
  • PM10: 11.23 µg/m³
  • O3: 0.052 ppm
  • NO2: 1.4 ppb
  • SO2: 0.3 ppb
  • CO: 0.29 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 6.48 µg/m³
  • PM10: 9.97 µg/m³
  • O3: 0.053 ppm
  • NO2: 1.3 ppb
  • SO2: 0.2 ppb
  • CO: 0.31 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 5.6 µg/m³
  • PM10: 8.78 µg/m³
  • O3: 0.052 ppm
  • NO2: 1.1 ppb
  • SO2: 0.2 ppb
  • CO: 0.31 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 5.1 µg/m³
  • PM10: 8.04 µg/m³
  • O3: 0.050 ppm
  • NO2: 0.9 ppb
  • SO2: 0.2 ppb
  • CO: 0.29 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 4.99 µg/m³
  • PM10: 7.23 µg/m³
  • O3: 0.047 ppm
  • NO2: 1 ppb
  • SO2: 0.2 ppb
  • CO: 0.27 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 5.02 µg/m³
  • PM10: 6.63 µg/m³
  • O3: 0.042 ppm
  • NO2: 1.3 ppb
  • SO2: 0.2 ppb
  • CO: 0.24 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 5.12 µg/m³
  • PM10: 6.41 µg/m³
  • O3: 0.038 ppm
  • NO2: 1.6 ppb
  • SO2: 0.2 ppb
  • CO: 0.21 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 5.12 µg/m³
  • PM10: 6.31 µg/m³
  • O3: 0.034 ppm
  • NO2: 1.9 ppb
  • SO2: 0.2 ppb
  • CO: 0.19 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 5.02 µg/m³
  • PM10: 6.25 µg/m³
  • O3: 0.030 ppm
  • NO2: 2.2 ppb
  • SO2: 0.3 ppb
  • CO: 0.16 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 4.91 µg/m³
  • PM10: 6.32 µg/m³
  • O3: 0.027 ppm
  • NO2: 2.7 ppb
  • SO2: 0.3 ppb
  • CO: 0.14 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: 4.9 µg/m³
  • PM10: 6.32 µg/m³
  • O3: 0.026 ppm
  • NO2: 3.2 ppb
  • SO2: 0.3 ppb
  • CO: 0.13 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 4.87 µg/m³
  • PM10: 6.07 µg/m³
  • O3: 0.025 ppm
  • NO2: 3.3 ppb
  • SO2: 0.3 ppb
  • CO: 0.13 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 4.78 µg/m³
  • PM10: 5.67 µg/m³
  • O3: 0.026 ppm
  • NO2: 3.2 ppb
  • SO2: 0.3 ppb
  • CO: 0.13 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 4.55 µg/m³
  • PM10: 5.16 µg/m³
  • O3: 0.026 ppm
  • NO2: 2.9 ppb
  • SO2: 0.3 ppb
  • CO: 0.12 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 4.35 µg/m³
  • PM10: 4.81 µg/m³
  • O3: 0.025 ppm
  • NO2: 3 ppb
  • SO2: 0.3 ppb
  • CO: 0.12 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 4.18 µg/m³
  • PM10: 4.55 µg/m³
  • O3: 0.023 ppm
  • NO2: 3.2 ppb
  • SO2: 0.3 ppb
  • CO: 0.12 ppm

Health Recommendations:

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