Hourly Weather | Today Thursday, February 26, 2026
Active Weather Warnings
Norwalk, Connecticut
3 AM
Icy Road Conditions
32°
Feels Like 25°
57
Humidity: 89%
UV Index: 0
Wind: 8 mph
4 AM
Cloudy Night
32°
Feels Like 27°
40
Frost Risk: 54%
Humidity: 90%
UV Index: 0
Wind: 7 mph
5 AM
Night
32°
Feels Like 27°
34
Frost Risk: 55%
Humidity: 85%
UV Index: 0
Wind: 7 mph
6 AM
Night
32°
Feels Like 27°
22
Humidity: 79%
UV Index: 0
Wind: 7 mph
7 AM
Cloudy Weather
32°
Feels Like 27°
0
Humidity: 75%
UV Index: 0
Wind: 8 mph
8 AM
Cloudy Weather
34°
Feels Like 28°
0
Humidity: 68%
UV Index: 1
Wind: 8 mph
9 AM
Cloudy Weather
36°
Feels Like 32°
0
Humidity: 62%
UV Index: 2
Wind: 9 mph
10 AM
Cloudy Weather
37°
Feels Like 34°
0
Humidity: 57%
UV Index: 2
Wind: 9 mph
11 AM
Cloudy Weather
39°
Feels Like 37°
0
Humidity: 53%
UV Index: 2
Wind: 8 mph
12 PM
Cloudy Weather
39°
Feels Like 39°
0
Humidity: 52%
UV Index: 2
Wind: 7 mph
1 PM
Cloudy Weather
39°
Feels Like 39°
7
Humidity: 52%
UV Index: 1
Wind: 7 mph
2 PM
Cloudy Weather
41°
Feels Like 39°
7
Humidity: 51%
UV Index: 1
Wind: 7 mph
3 PM
Cloudy Weather
39°
Feels Like 37°
7
Humidity: 56%
UV Index: 1
Wind: 6 mph
4 PM
Cloudy Weather
37°
Feels Like 36°
7
Humidity: 61%
UV Index: 0
Wind: 6 mph
5 PM
Cloudy Weather
37°
Feels Like 36°
7
Humidity: 64%
UV Index: 0
Wind: 6 mph
6 PM
Cloudy Weather
36°
Feels Like 34°
7
Humidity: 67%
UV Index: 0
Wind: 5 mph
7 PM
Cloudy Night
34°
Feels Like 30°
7
Humidity: 70%
UV Index: 0
Wind: 6 mph
8 PM
Cloudy Night
30°
Feels Like 28°
7
Humidity: 74%
UV Index: 0
Wind: 5 mph
9 PM
Cloudy Night
28°
Feels Like 27°
7
Humidity: 76%
UV Index: 0
Wind: 5 mph
10 PM
Cloudy Night
28°
Feels Like 27°
7
Humidity: 77%
UV Index: 0
Wind: 6 mph
11 PM
Cloudy Night
27°
Feels Like 25°
7
Frost Risk: 87%
Humidity: 77%
UV Index: 0
Wind: 6 mph

Hourly Air Quality Forecast - AQI (US EPA)

3 AM
38 AQI
Good air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 9.19 µg/m³
  • PM10: 11.45 µg/m³
  • O3: 0.036 ppm
  • NO2: 6.8 ppb
  • SO2: 0.8 ppb
  • CO: 0.21 ppm

Health Recommendations:

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

4 AM
39 AQI
Good air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 9.26 µg/m³
  • PM10: 11.46 µg/m³
  • O3: 0.036 ppm
  • NO2: 6.7 ppb
  • SO2: 0.8 ppb
  • CO: 0.21 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 9.37 µg/m³
  • PM10: 11.48 µg/m³
  • O3: 0.036 ppm
  • NO2: 6.7 ppb
  • SO2: 1 ppb
  • CO: 0.21 ppm

Health Recommendations:

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

6 AM
41 AQI
Good air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 9.83 µg/m³
  • PM10: 11.86 µg/m³
  • O3: 0.036 ppm
  • NO2: 6.9 ppb
  • SO2: 1.2 ppb
  • CO: 0.21 ppm

Health Recommendations:

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

7 AM
45 AQI
Good air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 10.79 µg/m³
  • PM10: 12.91 µg/m³
  • O3: 0.036 ppm
  • NO2: 8 ppb
  • SO2: 1.5 ppb
  • CO: 0.22 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: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 11.76 µg/m³
  • PM10: 14.1 µg/m³
  • O3: 0.036 ppm
  • NO2: 10.5 ppb
  • SO2: 1.7 ppb
  • CO: 0.23 ppm

Health Recommendations:

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

9 AM
51 AQI
Moderate air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 12.42 µg/m³
  • PM10: 15.13 µg/m³
  • O3: 0.036 ppm
  • NO2: 12.1 ppb
  • SO2: 1.8 ppb
  • CO: 0.25 ppm

Health Recommendations:

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

10 AM
53 AQI
Moderate air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 13.19 µg/m³
  • PM10: 16.25 µg/m³
  • O3: 0.038 ppm
  • NO2: 11.4 ppb
  • SO2: 1.8 ppb
  • CO: 0.26 ppm

Health Recommendations:

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

11 AM
56 AQI
Moderate air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 14.62 µg/m³
  • PM10: 17.8 µg/m³
  • O3: 0.041 ppm
  • NO2: 10.8 ppb
  • SO2: 1.9 ppb
  • CO: 0.26 ppm

Health Recommendations:

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

12 PM
63 AQI
Moderate air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 18.02 µg/m³
  • PM10: 21.56 µg/m³
  • O3: 0.043 ppm
  • NO2: 11.3 ppb
  • SO2: 1.8 ppb
  • CO: 0.27 ppm

Health Recommendations:

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

1 PM
72 AQI
Moderate air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 22.32 µg/m³
  • PM10: 26.22 µg/m³
  • O3: 0.044 ppm
  • NO2: 12.2 ppb
  • SO2: 1.8 ppb
  • CO: 0.28 ppm

Health Recommendations:

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

2 PM
80 AQI
Moderate air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 26.08 µg/m³
  • PM10: 30.23 µg/m³
  • O3: 0.044 ppm
  • NO2: 15.2 ppb
  • SO2: 1.9 ppb
  • CO: 0.30 ppm

Health Recommendations:

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

3 PM
83 AQI
Moderate air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 27.59 µg/m³
  • PM10: 31.72 µg/m³
  • O3: 0.043 ppm
  • NO2: 16.9 ppb
  • SO2: 1.9 ppb
  • CO: 0.31 ppm

Health Recommendations:

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

4 PM
83 AQI
Moderate air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 27.52 µg/m³
  • PM10: 31.49 µg/m³
  • O3: 0.041 ppm
  • NO2: 18.6 ppb
  • SO2: 1.9 ppb
  • CO: 0.31 ppm

Health Recommendations:

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

5 PM
83 AQI
Moderate air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 27.67 µg/m³
  • PM10: 31.67 µg/m³
  • O3: 0.037 ppm
  • NO2: 21.6 ppb
  • SO2: 1.6 ppb
  • CO: 0.32 ppm

Health Recommendations:

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

6 PM
87 AQI
Moderate air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 29.53 µg/m³
  • PM10: 33.89 µg/m³
  • O3: 0.029 ppm
  • NO2: 27.1 ppb
  • SO2: 1.2 ppb
  • CO: 0.37 ppm

Health Recommendations:

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

7 PM
95 AQI
Moderate air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 32.89 µg/m³
  • PM10: 37.7 µg/m³
  • O3: 0.023 ppm
  • NO2: 31.7 ppb
  • SO2: 1.1 ppb
  • CO: 0.41 ppm

Health Recommendations:

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

8 PM
104 AQI
Unhealthy air quality for sensitive groups Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 36.94 µg/m³
  • PM10: 42.26 µg/m³
  • O3: 0.019 ppm
  • NO2: 35.1 ppb
  • SO2: 1.1 ppb
  • CO: 0.46 ppm

Health Recommendations:

Members of sensitive groups may experience health effects. The general public is less likely to be affected.

9 PM
117 AQI
Unhealthy air quality for sensitive groups Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 42.17 µg/m³
  • PM10: 48.12 µg/m³
  • O3: 0.016 ppm
  • NO2: 37.9 ppb
  • SO2: 1.2 ppb
  • CO: 0.50 ppm

Health Recommendations:

Members of sensitive groups may experience health effects. The general public is less likely to be affected.

10 PM
134 AQI
Unhealthy air quality for sensitive groups Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 49.1 µg/m³
  • PM10: 56.11 µg/m³
  • O3: 0.013 ppm
  • NO2: 41.7 ppb
  • SO2: 1.2 ppb
  • CO: 0.57 ppm

Health Recommendations:

Members of sensitive groups may experience health effects. The general public is less likely to be affected.

11 PM
150 AQI
Unhealthy air quality for sensitive groups Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 55.34 µg/m³
  • PM10: 63.3 µg/m³
  • O3: 0.010 ppm
  • NO2: 46.1 ppb
  • SO2: 1.3 ppb
  • CO: 0.64 ppm

Health Recommendations:

Members of sensitive groups may experience health effects. The general public is less likely to be affected.

Weather Alerts and Warnings for Norwalk

Moderate Expected Observed

Special Weather Statement

Special Weather Statement issued February 25 at 11:52PM EST by NWS Upton NY
Feb 25, 11:52 PM Feb 26, 3:00 AM
Showers are currently moving through southern CT. This
precipitation is falling as freezing rain in some locations where
surface temperatures have dropped below freezing. A glaze of ice
is possible which could cause slick conditions.

Use caution if traveling tonight and leave extra room between you
and the car in front of you.
Updated: Feb 26, 2:41 AM Source: NWS Alert