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Hourly Weather | Today › Wednesday, August 12, 2026
Active Weather Warnings
Norwalk, Connecticut
9 AM
Cloudy Weather
73°
Feels Like 75°
0
Humidity: 66%
UV Index: 3
Wind: 7 mph
10 AM
Cloudy Weather
77°
Feels Like 81°
0
Humidity: 59%
UV Index: 4
Wind: 7 mph
11 AM
Cloudy Weather
81°
Feels Like 86°
0
Humidity: 54%
UV Index: 6
Wind: 7 mph
12 PM
Cloudy Weather
82°
Feels Like 90°
0
Humidity: 49%
UV Index: 8
Wind: 7 mph
1 PM
Cloudy Weather
84°
Feels Like 91°
0
Humidity: 46%
UV Index: 8
Wind: 7 mph
2 PM
Cloudy Weather
84°
Feels Like 91°
0
Humidity: 43%
UV Index: 8
Wind: 7 mph
3 PM
Cloudy Weather
86°
Feels Like 91°
0
Humidity: 41%
UV Index: 6
Wind: 7 mph
4 PM
Cloudy Weather
88°
Feels Like 91°
0
Humidity: 39%
UV Index: 4
Wind: 7 mph
5 PM
Cloudy Weather
86°
Feels Like 88°
0
Humidity: 41%
UV Index: 3
Wind: 7 mph
6 PM
Cloudy Weather
84°
Feels Like 84°
0
Humidity: 45%
UV Index: 2
Wind: 7 mph
7 PM
Cloudy Weather
82°
Feels Like 82°
0
Humidity: 50%
UV Index: 1
Wind: 7 mph
8 PM
Cloudy Night
81°
Feels Like 79°
43
Humidity: 58%
UV Index: 0
Wind: 6 mph
9 PM
Cloudy Night
77°
Feels Like 75°
47
Humidity: 66%
UV Index: 0
Wind: 6 mph
10 PM
Stormy Weather
73°
Feels Like 72°
51
Humidity: 78%
UV Index: 0
Wind: 6 mph
11 PM
Cloudy Night
72°
Feels Like 73°
19
Humidity: 85%
UV Index: 0
Wind: 6 mph

Hourly Air Quality Forecast - AQI (US EPA)

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

Pollutant Concentrations:

  • PM2.5: 4.42 µg/m³
  • PM10: 5.67 µg/m³
  • O3: 0.014 ppm
  • NO2: 6.7 ppb
  • SO2: 1.4 ppb
  • CO: 0.16 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 4.73 µg/m³
  • PM10: 6.08 µg/m³
  • O3: 0.019 ppm
  • NO2: 6.6 ppb
  • SO2: 1.5 ppb
  • CO: 0.16 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 5.64 µg/m³
  • PM10: 7.01 µg/m³
  • O3: 0.028 ppm
  • NO2: 6.3 ppb
  • SO2: 1.6 ppb
  • CO: 0.16 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: 6.08 µg/m³
  • PM10: 7.07 µg/m³
  • O3: 0.044 ppm
  • NO2: 4.2 ppb
  • SO2: 1.2 ppb
  • CO: 0.13 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 7.76 µg/m³
  • PM10: 8.58 µg/m³
  • O3: 0.053 ppm
  • NO2: 2.6 ppb
  • SO2: 0.9 ppb
  • CO: 0.12 ppm

Health Recommendations:

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

2 PM
71 AQI
Moderate air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 9.69 µg/m³
  • PM10: 10.42 µg/m³
  • O3: 0.061 ppm
  • NO2: 1.8 ppb
  • SO2: 0.8 ppb
  • CO: 0.12 ppm

Health Recommendations:

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

3 PM
81 AQI
Moderate air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 10.43 µg/m³
  • PM10: 11.11 µg/m³
  • O3: 0.064 ppm
  • NO2: 1.7 ppb
  • SO2: 0.7 ppb
  • CO: 0.12 ppm

Health Recommendations:

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

4 PM
77 AQI
Moderate air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 10.09 µg/m³
  • PM10: 10.76 µg/m³
  • O3: 0.063 ppm
  • NO2: 2.2 ppb
  • SO2: 0.7 ppb
  • CO: 0.12 ppm

Health Recommendations:

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

5 PM
68 AQI
Moderate air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 9.34 µg/m³
  • PM10: 10.02 µg/m³
  • O3: 0.060 ppm
  • NO2: 2.9 ppb
  • SO2: 0.7 ppb
  • CO: 0.12 ppm

Health Recommendations:

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

6 PM
53 AQI
Moderate air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 8.74 µg/m³
  • PM10: 9.5 µg/m³
  • O3: 0.055 ppm
  • NO2: 3.9 ppb
  • SO2: 0.7 ppb
  • CO: 0.13 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 8.17 µg/m³
  • PM10: 9.07 µg/m³
  • O3: 0.049 ppm
  • NO2: 5.1 ppb
  • SO2: 0.8 ppb
  • CO: 0.13 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 7.57 µg/m³
  • PM10: 8.61 µg/m³
  • O3: 0.043 ppm
  • NO2: 5.9 ppb
  • SO2: 0.8 ppb
  • CO: 0.14 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 7.12 µg/m³
  • PM10: 8.29 µg/m³
  • O3: 0.037 ppm
  • NO2: 6.4 ppb
  • SO2: 0.8 ppb
  • CO: 0.14 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: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 7.12 µg/m³
  • PM10: 8.47 µg/m³
  • O3: 0.031 ppm
  • NO2: 7.2 ppb
  • SO2: 0.8 ppb
  • CO: 0.15 ppm

Health Recommendations:

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

11 PM
31 AQI
Good air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 7.34 µg/m³
  • PM10: 8.82 µg/m³
  • O3: 0.026 ppm
  • NO2: 8.1 ppb
  • SO2: 0.7 ppb
  • CO: 0.16 ppm

Health Recommendations:

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

Current Real-Time Air Quality Report

Weather Alerts and Warnings for Norwalk

Minor Expected Likely

Coastal Flood Statement

Coastal Flood Statement issued August 12 at 3:07AM EDT until August 13 at 1:00AM EDT by NWS Upton NY
Aug 12, 11:00 PM → Aug 13, 1:00 AM
WHAT: Up to one half foot of inundation above ground level
expected in vulnerable areas near the waterfront and shoreline.

WHERE: In Connecticut, Southern Fairfield County. In New
York, Southern Westchester County.

WHEN: From this evening through late tonight.

IMPACTS: Brief minor flooding of the more vulnerable
locations near the waterfront and shoreline.

ADDITIONAL DETAILS: Another round of localized minor
flooding are likely for the Thursday night high tide.
+ Read More
Do not drive through flooded roadways.
Updated: Aug 12, 7:13 AM Source: NWS Alert

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