Hourly Weather | Today Thursday, May 21, 2026
Hartford, Connecticut
6 AM
Cloudy Weather
61°
Feels Like 57°
40
Humidity: 66%
UV Index: 0
Wind: 7 mph
7 AM
Cloudy Weather
57°
Feels Like 57°
42
Humidity: 63%
UV Index: 1
Wind: 8 mph
8 AM
Rainy Weather
61°
Feels Like 57°
51
Humidity: 60%
UV Index: 1
Wind: 8 mph
9 AM
Cloudy Weather
61°
Feels Like 61°
47
Humidity: 61%
UV Index: 1
Wind: 8 mph
10 AM
Cloudy Weather
63°
Feels Like 63°
44
Humidity: 56%
UV Index: 2
Wind: 7 mph
11 AM
Cloudy Weather
63°
Feels Like 64°
44
Humidity: 53%
UV Index: 3
Wind: 7 mph
12 PM
Cloudy Weather
63°
Feels Like 66°
48
Humidity: 50%
UV Index: 3
Wind: 7 mph
1 PM
Rainy Weather
64°
Feels Like 66°
52
Humidity: 47%
UV Index: 3
Wind: 6 mph
2 PM
Cloudy Weather
64°
Feels Like 70°
5
Humidity: 45%
UV Index: 4
Wind: 6 mph
3 PM
Cloudy Weather
64°
Feels Like 70°
2
Humidity: 45%
UV Index: 3
Wind: 5 mph
4 PM
Cloudy Weather
64°
Feels Like 66°
2
Humidity: 45%
UV Index: 2
Wind: 6 mph
5 PM
Cloudy Weather
64°
Feels Like 66°
2
Humidity: 44%
UV Index: 2
Wind: 6 mph
6 PM
Cloudy Weather
64°
Feels Like 66°
2
Humidity: 47%
UV Index: 1
Wind: 6 mph
7 PM
Cloudy Weather
63°
Feels Like 64°
1
Humidity: 50%
UV Index: 1
Wind: 5 mph
8 PM
Cloudy Weather
63°
Feels Like 63°
0
Humidity: 55%
UV Index: 0
Wind: 5 mph
9 PM
Cloudy Night
61°
Feels Like 59°
0
Humidity: 60%
UV Index: 0
Wind: 5 mph
10 PM
Cloudy Night
57°
Feels Like 57°
0
Humidity: 64%
UV Index: 0
Wind: 5 mph
11 PM
Cloudy Night
54°
Feels Like 54°
0
Humidity: 69%
UV Index: 0
Wind: 4 mph

Hourly Air Quality Forecast - AQI (US EPA)

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

Pollutant Concentrations:

  • PM2.5: 2.07 µg/m³
  • PM10: 3.07 µg/m³
  • O3: 0.034 ppm
  • NO2: 3.5 ppb
  • SO2: 0.8 ppb
  • CO: 0.12 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 2.23 µg/m³
  • PM10: 3.18 µg/m³
  • O3: 0.033 ppm
  • NO2: 4.2 ppb
  • SO2: 0.8 ppb
  • CO: 0.12 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 2.4 µg/m³
  • PM10: 3.43 µg/m³
  • O3: 0.030 ppm
  • NO2: 5.5 ppb
  • SO2: 0.8 ppb
  • CO: 0.13 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 2.4 µg/m³
  • PM10: 3.44 µg/m³
  • O3: 0.028 ppm
  • NO2: 6.2 ppb
  • SO2: 0.7 ppb
  • CO: 0.14 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 2.3 µg/m³
  • PM10: 3.34 µg/m³
  • O3: 0.027 ppm
  • NO2: 6.1 ppb
  • SO2: 0.7 ppb
  • CO: 0.14 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 2.19 µg/m³
  • PM10: 3.23 µg/m³
  • O3: 0.027 ppm
  • NO2: 5.7 ppb
  • SO2: 0.7 ppb
  • CO: 0.14 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 2.14 µg/m³
  • PM10: 3.22 µg/m³
  • O3: 0.028 ppm
  • NO2: 5.1 ppb
  • SO2: 0.8 ppb
  • CO: 0.14 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: 2.25 µg/m³
  • PM10: 3.39 µg/m³
  • O3: 0.030 ppm
  • NO2: 4.6 ppb
  • SO2: 0.8 ppb
  • CO: 0.14 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: 2.54 µg/m³
  • PM10: 3.7 µg/m³
  • O3: 0.033 ppm
  • NO2: 4.1 ppb
  • SO2: 0.8 ppb
  • CO: 0.14 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 2.95 µg/m³
  • PM10: 4.15 µg/m³
  • O3: 0.037 ppm
  • NO2: 3.4 ppb
  • SO2: 0.8 ppb
  • CO: 0.14 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 3.35 µg/m³
  • PM10: 4.66 µg/m³
  • O3: 0.040 ppm
  • NO2: 3.3 ppb
  • SO2: 0.8 ppb
  • CO: 0.14 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 3.55 µg/m³
  • PM10: 4.99 µg/m³
  • O3: 0.042 ppm
  • NO2: 3.6 ppb
  • SO2: 0.9 ppb
  • CO: 0.14 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: 3.77 µg/m³
  • PM10: 5.48 µg/m³
  • O3: 0.041 ppm
  • NO2: 4.5 ppb
  • SO2: 0.9 ppb
  • CO: 0.15 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 4.07 µg/m³
  • PM10: 6.24 µg/m³
  • O3: 0.038 ppm
  • NO2: 6.3 ppb
  • SO2: 0.9 ppb
  • CO: 0.16 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 4.26 µg/m³
  • PM10: 6.84 µg/m³
  • O3: 0.035 ppm
  • NO2: 8 ppb
  • SO2: 1 ppb
  • CO: 0.17 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 4.41 µg/m³
  • PM10: 7.38 µg/m³
  • O3: 0.033 ppm
  • NO2: 8.7 ppb
  • SO2: 0.9 ppb
  • CO: 0.17 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: 4.67 µg/m³
  • PM10: 8.12 µg/m³
  • O3: 0.030 ppm
  • NO2: 9.5 ppb
  • SO2: 0.9 ppb
  • CO: 0.18 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 4.95 µg/m³
  • PM10: 8.76 µg/m³
  • O3: 0.028 ppm
  • NO2: 10.4 ppb
  • SO2: 0.9 ppb
  • CO: 0.18 ppm

Health Recommendations:

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