Hourly Weather | Today Saturday, March 28, 2026
Cambridge, Massachusetts
3 AM
Cloudy Night
28°
Feels Like 21°
0
Humidity: 55%
UV Index: 0
Wind: 8 mph
4 AM
Cloudy Night
28°
Feels Like 21°
0
Humidity: 58%
UV Index: 0
Wind: 8 mph
5 AM
Cloudy Night
27°
Feels Like 19°
0
Frost Risk: 42%
Humidity: 61%
UV Index: 0
Wind: 8 mph
6 AM
Cloudy Night
27°
Feels Like 19°
0
Frost Risk: 42%
Humidity: 62%
UV Index: 0
Wind: 8 mph
7 AM
Cloudy Weather
25°
Feels Like 18°
0
Frost Risk: 82%
Humidity: 61%
UV Index: 0
Wind: 9 mph
8 AM
Cloudy Weather
27°
Feels Like 19°
1
Humidity: 55%
UV Index: 1
Wind: 9 mph
9 AM
Cloudy Weather
28°
Feels Like 21°
1
Humidity: 50%
UV Index: 2
Wind: 10 mph
10 AM
Cloudy Weather
30°
Feels Like 27°
1
Humidity: 44%
UV Index: 3
Wind: 10 mph
11 AM
Cloudy Weather
32°
Feels Like 28°
1
Humidity: 40%
UV Index: 4
Wind: 10 mph
12 PM
Cloudy Weather
34°
Feels Like 32°
1
Humidity: 35%
UV Index: 5
Wind: 10 mph
1 PM
Cloudy Weather
36°
Feels Like 34°
1
Humidity: 31%
UV Index: 5
Wind: 12 mph
2 PM
Cloudy Weather
36°
Feels Like 34°
0
Humidity: 29%
UV Index: 5
Wind: 12 mph
3 PM
Cloudy Weather
37°
Feels Like 34°
0
Humidity: 27%
UV Index: 4
Wind: 13 mph
4 PM
Cloudy Weather
37°
Feels Like 34°
0
Humidity: 25%
UV Index: 3
Wind: 13 mph
5 PM
Cloudy Weather
37°
Feels Like 30°
0
Humidity: 25%
UV Index: 2
Wind: 13 mph
6 PM
Cloudy Weather
37°
Feels Like 28°
0
Humidity: 27%
UV Index: 1
Wind: 12 mph
7 PM
Cloudy Weather
36°
Feels Like 28°
0
Humidity: 33%
UV Index: 0
Wind: 9 mph
8 PM
Cloudy Night
36°
Feels Like 28°
0
Humidity: 38%
UV Index: 0
Wind: 8 mph
9 PM
Cloudy Night
34°
Feels Like 27°
0
Humidity: 42%
UV Index: 0
Wind: 8 mph
10 PM
Cloudy Night
32°
Feels Like 25°
0
Humidity: 45%
UV Index: 0
Wind: 8 mph
11 PM
Cloudy Night
32°
Feels Like 25°
0
Humidity: 46%
UV Index: 0
Wind: 8 mph

Hourly Air Quality Forecast - AQI (US EPA)

3 AM
44 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 3.02 µg/m³
  • PM10: 4.78 µg/m³
  • O3: 0.048 ppm
  • NO2: 3.7 ppb
  • SO2: 0.7 ppb
  • CO: 0.16 ppm

Health Recommendations:

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

4 AM
45 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 3.34 µg/m³
  • PM10: 5.1 µg/m³
  • O3: 0.049 ppm
  • NO2: 3.2 ppb
  • SO2: 0.8 ppb
  • CO: 0.16 ppm

Health Recommendations:

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

5 AM
47 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 3.44 µg/m³
  • PM10: 5.1 µg/m³
  • O3: 0.050 ppm
  • NO2: 2.7 ppb
  • SO2: 0.7 ppb
  • CO: 0.16 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 3.26 µg/m³
  • PM10: 4.77 µg/m³
  • O3: 0.051 ppm
  • NO2: 2.2 ppb
  • SO2: 0.7 ppb
  • CO: 0.15 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 3.08 µg/m³
  • PM10: 4.48 µg/m³
  • O3: 0.052 ppm
  • NO2: 2 ppb
  • SO2: 0.7 ppb
  • CO: 0.15 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 2.99 µg/m³
  • PM10: 4.33 µg/m³
  • O3: 0.052 ppm
  • NO2: 2.3 ppb
  • SO2: 0.7 ppb
  • CO: 0.15 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 2.73 µg/m³
  • PM10: 3.95 µg/m³
  • O3: 0.052 ppm
  • NO2: 2.4 ppb
  • SO2: 0.6 ppb
  • CO: 0.15 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 2.58 µg/m³
  • PM10: 3.7 µg/m³
  • O3: 0.052 ppm
  • NO2: 2.2 ppb
  • SO2: 0.6 ppb
  • CO: 0.15 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 2.68 µg/m³
  • PM10: 3.74 µg/m³
  • O3: 0.052 ppm
  • NO2: 1.9 ppb
  • SO2: 0.6 ppb
  • CO: 0.15 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 2.53 µg/m³
  • PM10: 3.41 µg/m³
  • O3: 0.053 ppm
  • NO2: 1.5 ppb
  • SO2: 0.5 ppb
  • CO: 0.15 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 2.16 µg/m³
  • PM10: 2.85 µg/m³
  • O3: 0.055 ppm
  • NO2: 1.1 ppb
  • SO2: 0.4 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.

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

Pollutant Concentrations:

  • PM2.5: 1.82 µg/m³
  • PM10: 2.38 µg/m³
  • O3: 0.056 ppm
  • NO2: 0.8 ppb
  • SO2: 0.3 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.

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

Pollutant Concentrations:

  • PM2.5: 1.42 µg/m³
  • PM10: 1.85 µg/m³
  • O3: 0.058 ppm
  • NO2: 0.6 ppb
  • SO2: 0.2 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.

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

Pollutant Concentrations:

  • PM2.5: 0.97 µg/m³
  • PM10: 1.3 µg/m³
  • O3: 0.059 ppm
  • NO2: 0.5 ppb
  • SO2: 0.2 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.

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

Pollutant Concentrations:

  • PM2.5: 0.67 µg/m³
  • PM10: 0.93 µg/m³
  • O3: 0.058 ppm
  • NO2: 0.5 ppb
  • SO2: 0.1 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.

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

Pollutant Concentrations:

  • PM2.5: 0.56 µg/m³
  • PM10: 0.82 µg/m³
  • O3: 0.056 ppm
  • NO2: 0.9 ppb
  • SO2: 0.1 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
49 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 0.57 µg/m³
  • PM10: 0.88 µg/m³
  • O3: 0.053 ppm
  • NO2: 2 ppb
  • SO2: 0.1 ppb
  • CO: 0.14 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 0.66 µg/m³
  • PM10: 1.06 µg/m³
  • O3: 0.050 ppm
  • NO2: 2.8 ppb
  • SO2: 0.1 ppb
  • CO: 0.15 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: O3
Details

Pollutant Concentrations:

  • PM2.5: 0.76 µg/m³
  • PM10: 1.26 µg/m³
  • O3: 0.049 ppm
  • NO2: 3.1 ppb
  • SO2: 0.1 ppb
  • CO: 0.16 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: O3
Details

Pollutant Concentrations:

  • PM2.5: 0.81 µg/m³
  • PM10: 1.42 µg/m³
  • O3: 0.048 ppm
  • NO2: 3 ppb
  • SO2: 0.2 ppb
  • CO: 0.16 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 0.81 µg/m³
  • PM10: 1.5 µg/m³
  • O3: 0.049 ppm
  • NO2: 2.7 ppb
  • SO2: 0.2 ppb
  • CO: 0.15 ppm

Health Recommendations:

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