Hourly Weather | Today Monday, September 14, 2026
Cambridge, Massachusetts
4 AM
Foggy Weather
66°
Feels Like 64°
20
Humidity: 93%
UV Index: 0
Wind: 8 mph
5 AM
Foggy Weather
66°
Feels Like 64°
49
Humidity: 91%
UV Index: 0
Wind: 8 mph
6 AM
Rainy Night
66°
Feels Like 61°
61
Humidity: 90%
UV Index: 0
Wind: 8 mph
7 AM
Partly Sunny with Showers
64°
Feels Like 61°
61
Humidity: 89%
UV Index: 0
Wind: 8 mph
8 AM
Cloudy Weather
66°
Feels Like 63°
25
Humidity: 83%
UV Index: 1
Wind: 9 mph
9 AM
Cloudy Weather
66°
Feels Like 64°
20
Humidity: 74%
UV Index: 1
Wind: 10 mph
10 AM
Cloudy Weather
70°
Feels Like 70°
20
Humidity: 64%
UV Index: 3
Wind: 12 mph
11 AM
Cloudy Weather
72°
Feels Like 72°
20
Humidity: 57%
UV Index: 4
Wind: 13 mph
12 PM
Sunny Weather
72°
Feels Like 73°
20
Humidity: 51%
UV Index: 5
Wind: 14 mph
1 PM
Sunny Weather
73°
Feels Like 75°
13
Humidity: 46%
UV Index: 5
Wind: 14 mph
2 PM
Cloudy Weather
73°
Feels Like 73°
0
Humidity: 43%
UV Index: 5
Wind: 14 mph
3 PM
Cloudy Weather
75°
Feels Like 75°
0
Humidity: 39%
UV Index: 4
Wind: 14 mph
4 PM
Cloudy Weather
73°
Feels Like 73°
0
Humidity: 41%
UV Index: 3
Wind: 14 mph
5 PM
Cloudy Weather
72°
Feels Like 72°
0
Humidity: 42%
UV Index: 2
Wind: 13 mph
6 PM
Cloudy Weather
70°
Feels Like 68°
0
Humidity: 43%
UV Index: 1
Wind: 13 mph
7 PM
Night
66°
Feels Like 64°
0
Humidity: 47%
UV Index: 0
Wind: 12 mph
8 PM
Night
64°
Feels Like 61°
0
Humidity: 52%
UV Index: 0
Wind: 10 mph
9 PM
Night
63°
Feels Like 59°
0
Humidity: 56%
UV Index: 0
Wind: 9 mph
10 PM
Night
61°
Feels Like 55°
0
Humidity: 60%
UV Index: 0
Wind: 9 mph
11 PM
Night
57°
Feels Like 55°
0
Humidity: 64%
UV Index: 0
Wind: 8 mph

Hourly Air Quality Forecast - AQI (US EPA)

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

Pollutant Concentrations:

  • PM2.5: 8.41 µg/m³
  • PM10: 11.54 µg/m³
  • O3: 0.019 ppm
  • NO2: 3.4 ppb
  • SO2: 0.4 ppb
  • CO: 0.16 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 8.09 µg/m³
  • PM10: 10.79 µg/m³
  • O3: 0.018 ppm
  • NO2: 3.3 ppb
  • SO2: 0.4 ppb
  • CO: 0.16 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 6.91 µg/m³
  • PM10: 8.79 µg/m³
  • O3: 0.018 ppm
  • NO2: 3 ppb
  • SO2: 0.4 ppb
  • CO: 0.16 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 5.52 µg/m³
  • PM10: 6.64 µg/m³
  • O3: 0.018 ppm
  • NO2: 2.6 ppb
  • SO2: 0.3 ppb
  • CO: 0.15 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 4.16 µg/m³
  • PM10: 4.88 µg/m³
  • O3: 0.019 ppm
  • NO2: 2.3 ppb
  • SO2: 0.2 ppb
  • CO: 0.14 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 3.06 µg/m³
  • PM10: 3.49 µg/m³
  • O3: 0.022 ppm
  • NO2: 2 ppb
  • SO2: 0.2 ppb
  • CO: 0.14 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: 2.73 µg/m³
  • PM10: 3.13 µg/m³
  • O3: 0.025 ppm
  • NO2: 1.8 ppb
  • SO2: 0.2 ppb
  • CO: 0.14 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: 2.77 µg/m³
  • PM10: 3.18 µg/m³
  • O3: 0.028 ppm
  • NO2: 1.5 ppb
  • SO2: 0.2 ppb
  • CO: 0.14 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 2.68 µg/m³
  • PM10: 3.06 µg/m³
  • O3: 0.034 ppm
  • NO2: 1 ppb
  • SO2: 0.2 ppb
  • CO: 0.14 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 2.55 µg/m³
  • PM10: 2.93 µg/m³
  • O3: 0.038 ppm
  • NO2: 0.7 ppb
  • SO2: 0.2 ppb
  • CO: 0.15 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 2.34 µg/m³
  • PM10: 2.7 µg/m³
  • O3: 0.040 ppm
  • NO2: 0.5 ppb
  • SO2: 0.2 ppb
  • CO: 0.16 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 1.99 µg/m³
  • PM10: 2.31 µg/m³
  • O3: 0.041 ppm
  • NO2: 0.5 ppb
  • SO2: 0.2 ppb
  • CO: 0.17 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: 1.71 µg/m³
  • PM10: 2.02 µg/m³
  • O3: 0.040 ppm
  • NO2: 0.6 ppb
  • SO2: 0.2 ppb
  • CO: 0.17 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 1.5 µg/m³
  • PM10: 1.8 µg/m³
  • O3: 0.039 ppm
  • NO2: 0.8 ppb
  • SO2: 0.2 ppb
  • CO: 0.18 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 1.3 µg/m³
  • PM10: 1.61 µg/m³
  • O3: 0.036 ppm
  • NO2: 1.3 ppb
  • SO2: 0.2 ppb
  • CO: 0.18 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 1.13 µg/m³
  • PM10: 1.49 µg/m³
  • O3: 0.032 ppm
  • NO2: 2.4 ppb
  • SO2: 0.2 ppb
  • CO: 0.18 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 0.99 µg/m³
  • PM10: 1.41 µg/m³
  • O3: 0.029 ppm
  • NO2: 3 ppb
  • SO2: 0.2 ppb
  • CO: 0.18 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 0.88 µg/m³
  • PM10: 1.37 µg/m³
  • O3: 0.028 ppm
  • NO2: 3.1 ppb
  • SO2: 0.2 ppb
  • CO: 0.18 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 0.81 µg/m³
  • PM10: 1.33 µg/m³
  • O3: 0.028 ppm
  • NO2: 2.9 ppb
  • SO2: 0.2 ppb
  • CO: 0.18 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 0.78 µg/m³
  • PM10: 1.3 µg/m³
  • O3: 0.030 ppm
  • NO2: 2.6 ppb
  • SO2: 0.2 ppb
  • CO: 0.18 ppm

Health Recommendations:

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