Hourly Weather | Today Friday, September 11, 2026
Hartford, Connecticut
5 AM
Cloudy Night
61°
Feels Like 61°
0
Humidity: 80%
UV Index: 0
Wind: 5 mph
6 AM
Cloudy Night
61°
Feels Like 57°
0
Humidity: 82%
UV Index: 0
Wind: 6 mph
7 AM
Cloudy Weather
61°
Feels Like 61°
0
Humidity: 78%
UV Index: 0
Wind: 6 mph
8 AM
Cloudy Weather
64°
Feels Like 64°
0
Humidity: 71%
UV Index: 1
Wind: 7 mph
9 AM
Cloudy Weather
66°
Feels Like 66°
0
Humidity: 64%
UV Index: 2
Wind: 7 mph
10 AM
Cloudy Weather
70°
Feels Like 72°
0
Humidity: 56%
UV Index: 3
Wind: 8 mph
11 AM
Cloudy Weather
72°
Feels Like 73°
0
Humidity: 50%
UV Index: 4
Wind: 8 mph
12 PM
Sunny Weather
73°
Feels Like 77°
0
Humidity: 45%
UV Index: 5
Wind: 8 mph
1 PM
Sunny Weather
75°
Feels Like 81°
0
Humidity: 40%
UV Index: 6
Wind: 8 mph
2 PM
Cloudy Weather
75°
Feels Like 81°
0
Humidity: 38%
UV Index: 5
Wind: 8 mph
3 PM
Cloudy Weather
77°
Feels Like 81°
0
Humidity: 36%
UV Index: 4
Wind: 8 mph
4 PM
Cloudy Weather
79°
Feels Like 79°
0
Humidity: 35%
UV Index: 3
Wind: 8 mph
5 PM
Cloudy Weather
75°
Feels Like 75°
0
Humidity: 37%
UV Index: 2
Wind: 8 mph
6 PM
Sunny Weather
73°
Feels Like 73°
0
Humidity: 40%
UV Index: 1
Wind: 7 mph
7 PM
Sunny Weather
72°
Feels Like 70°
0
Humidity: 47%
UV Index: 0
Wind: 6 mph
8 PM
Night
70°
Feels Like 66°
0
Humidity: 55%
UV Index: 0
Wind: 5 mph
9 PM
Night
64°
Feels Like 63°
0
Humidity: 64%
UV Index: 0
Wind: 5 mph
10 PM
Night
63°
Feels Like 63°
0
Humidity: 71%
UV Index: 0
Wind: 5 mph
11 PM
Night
59°
Feels Like 61°
0
Humidity: 78%
UV Index: 0
Wind: 4 mph

Hourly Air Quality Forecast - AQI (US EPA)

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

Pollutant Concentrations:

  • PM2.5: 3.99 µg/m³
  • PM10: 7.3 µg/m³
  • O3: 0.018 ppm
  • NO2: 8.2 ppb
  • SO2: 1.2 ppb
  • CO: 0.16 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 3.74 µg/m³
  • PM10: 6.35 µg/m³
  • O3: 0.020 ppm
  • NO2: 6.8 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 AM
20 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 3.72 µg/m³
  • PM10: 6.08 µg/m³
  • O3: 0.022 ppm
  • NO2: 6.8 ppb
  • SO2: 1.2 ppb
  • CO: 0.14 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 3.87 µg/m³
  • PM10: 6.35 µg/m³
  • O3: 0.022 ppm
  • NO2: 8.2 ppb
  • SO2: 1.2 ppb
  • CO: 0.15 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 3.83 µg/m³
  • PM10: 6.26 µg/m³
  • O3: 0.023 ppm
  • NO2: 8.5 ppb
  • SO2: 1.3 ppb
  • CO: 0.15 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 3.64 µg/m³
  • PM10: 6.04 µg/m³
  • O3: 0.025 ppm
  • NO2: 8.1 ppb
  • SO2: 1.3 ppb
  • CO: 0.15 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 3.36 µg/m³
  • PM10: 5.64 µg/m³
  • O3: 0.027 ppm
  • NO2: 7.5 ppb
  • SO2: 1.4 ppb
  • CO: 0.15 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 3.11 µg/m³
  • PM10: 5.28 µg/m³
  • O3: 0.031 ppm
  • NO2: 6.2 ppb
  • SO2: 1.4 ppb
  • CO: 0.14 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 3.3 µg/m³
  • PM10: 5.44 µg/m³
  • O3: 0.036 ppm
  • NO2: 5.4 ppb
  • SO2: 1.4 ppb
  • CO: 0.14 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 4.2 µg/m³
  • PM10: 6.32 µg/m³
  • O3: 0.043 ppm
  • NO2: 4.7 ppb
  • SO2: 1.5 ppb
  • CO: 0.14 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 6 µg/m³
  • PM10: 8.12 µg/m³
  • O3: 0.052 ppm
  • NO2: 3.9 ppb
  • SO2: 1.5 ppb
  • CO: 0.14 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 7.95 µg/m³
  • PM10: 10.15 µg/m³
  • O3: 0.059 ppm
  • NO2: 3.7 ppb
  • SO2: 1.5 ppb
  • CO: 0.14 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 9.18 µg/m³
  • PM10: 11.45 µg/m³
  • O3: 0.062 ppm
  • NO2: 3.9 ppb
  • SO2: 1.6 ppb
  • CO: 0.14 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 9.96 µg/m³
  • PM10: 12.71 µg/m³
  • O3: 0.059 ppm
  • NO2: 6.9 ppb
  • SO2: 1.6 ppb
  • CO: 0.16 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 10.47 µg/m³
  • PM10: 14.18 µg/m³
  • O3: 0.052 ppm
  • NO2: 12 ppb
  • SO2: 1.7 ppb
  • CO: 0.19 ppm

Health Recommendations:

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

8 PM
45 AQI
Good air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 10.7 µg/m³
  • PM10: 15.37 µg/m³
  • O3: 0.046 ppm
  • NO2: 14.7 ppb
  • SO2: 1.7 ppb
  • CO: 0.21 ppm

Health Recommendations:

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

9 PM
45 AQI
Good air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 10.81 µg/m³
  • PM10: 16.3 µg/m³
  • O3: 0.043 ppm
  • NO2: 16 ppb
  • SO2: 1.7 ppb
  • CO: 0.23 ppm

Health Recommendations:

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

10 PM
45 AQI
Good air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 10.85 µg/m³
  • PM10: 17.16 µg/m³
  • O3: 0.039 ppm
  • NO2: 17.2 ppb
  • SO2: 1.6 ppb
  • CO: 0.24 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 10.68 µg/m³
  • PM10: 17.46 µg/m³
  • O3: 0.035 ppm
  • NO2: 18 ppb
  • SO2: 1.5 ppb
  • CO: 0.25 ppm

Health Recommendations:

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