Hourly Weather | Today › Sunday, October 25, 2026
Cambridge, Massachusetts
7 AM
Night
32°
Feels Like 30°
0
Frost Risk: 96%
Humidity: 100%
UV Index: 0
Wind: 5 mph
8 AM
Sunny Weather
36°
Feels Like 34°
0
Humidity: 85%
UV Index: 0
Wind: 5 mph
9 AM
Sunny Weather
41°
Feels Like 43°
0
Humidity: 71%
UV Index: 1
Wind: 5 mph
10 AM
Sunny Weather
46°
Feels Like 52°
0
Humidity: 60%
UV Index: 2
Wind: 5 mph
11 AM
Sunny Weather
54°
Feels Like 57°
0
Humidity: 51%
UV Index: 2
Wind: 5 mph
12 PM
Sunny Weather
57°
Feels Like 63°
0
Humidity: 43%
UV Index: 3
Wind: 5 mph
1 PM
Sunny Weather
61°
Feels Like 66°
0
Humidity: 37%
UV Index: 3
Wind: 6 mph
2 PM
Sunny Weather
63°
Feels Like 66°
0
Humidity: 34%
UV Index: 3
Wind: 6 mph
3 PM
Sunny Weather
64°
Feels Like 66°
0
Humidity: 33%
UV Index: 2
Wind: 6 mph
4 PM
Sunny Weather
64°
Feels Like 66°
0
Humidity: 36%
UV Index: 2
Wind: 6 mph
5 PM
Sunny Weather
63°
Feels Like 63°
0
Humidity: 41%
UV Index: 1
Wind: 6 mph
6 PM
Night
57°
Feels Like 57°
0
Humidity: 48%
UV Index: 0
Wind: 6 mph
7 PM
Night
55°
Feels Like 54°
0
Humidity: 55%
UV Index: 0
Wind: 6 mph
8 PM
Night
52°
Feels Like 50°
0
Humidity: 61%
UV Index: 0
Wind: 6 mph
9 PM
Night
48°
Feels Like 46°
0
Humidity: 68%
UV Index: 0
Wind: 6 mph
10 PM
Night
46°
Feels Like 45°
0
Humidity: 73%
UV Index: 0
Wind: 6 mph
11 PM
Night
45°
Feels Like 43°
0
Humidity: 77%
UV Index: 0
Wind: 6 mph

Hourly Air Quality Forecast - AQI (US EPA)

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

Pollutant Concentrations:

  • PM2.5: 4.6 µg/m³
  • PM10: 6.36 µg/m³
  • O3: 0.012 ppm
  • NO2: 10 ppb
  • SO2: 0.3 ppb
  • CO: 0.24 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: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 4.68 µg/m³
  • PM10: 6.43 µg/m³
  • O3: 0.012 ppm
  • NO2: 9.8 ppb
  • SO2: 0.3 ppb
  • CO: 0.25 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: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 4.72 µg/m³
  • PM10: 6.49 µg/m³
  • O3: 0.014 ppm
  • NO2: 7.8 ppb
  • SO2: 0.3 ppb
  • CO: 0.25 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: 4.71 µg/m³
  • PM10: 6.5 µg/m³
  • O3: 0.015 ppm
  • NO2: 6.3 ppb
  • SO2: 0.3 ppb
  • CO: 0.25 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 4.8 µg/m³
  • PM10: 6.57 µg/m³
  • O3: 0.017 ppm
  • NO2: 5.7 ppb
  • SO2: 0.4 ppb
  • CO: 0.25 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: 4 µg/m³
  • PM10: 5.42 µg/m³
  • O3: 0.031 ppm
  • NO2: 4.1 ppb
  • SO2: 0.6 ppb
  • CO: 0.20 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 4.56 µg/m³
  • PM10: 5.89 µg/m³
  • O3: 0.036 ppm
  • NO2: 3.5 ppb
  • SO2: 0.6 ppb
  • CO: 0.19 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 5.54 µg/m³
  • PM10: 6.84 µg/m³
  • O3: 0.039 ppm
  • NO2: 3.4 ppb
  • SO2: 0.7 ppb
  • CO: 0.19 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: 6.51 µg/m³
  • PM10: 7.78 µg/m³
  • O3: 0.041 ppm
  • NO2: 3.5 ppb
  • SO2: 0.7 ppb
  • CO: 0.19 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: 7.09 µg/m³
  • PM10: 8.32 µg/m³
  • O3: 0.040 ppm
  • NO2: 3.7 ppb
  • SO2: 0.7 ppb
  • CO: 0.19 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 7.09 µg/m³
  • PM10: 8.27 µg/m³
  • O3: 0.040 ppm
  • NO2: 4 ppb
  • SO2: 0.6 ppb
  • CO: 0.19 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 6.92 µg/m³
  • PM10: 8.03 µg/m³
  • O3: 0.039 ppm
  • NO2: 4.3 ppb
  • SO2: 0.6 ppb
  • CO: 0.18 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: 6.76 µg/m³
  • PM10: 7.87 µg/m³
  • O3: 0.038 ppm
  • NO2: 4.7 ppb
  • SO2: 0.5 ppb
  • CO: 0.18 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: 6.47 µg/m³
  • PM10: 7.61 µg/m³
  • O3: 0.036 ppm
  • NO2: 5 ppb
  • SO2: 0.5 ppb
  • CO: 0.18 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 6.12 µg/m³
  • PM10: 7.37 µg/m³
  • O3: 0.035 ppm
  • NO2: 4.8 ppb
  • SO2: 0.4 ppb
  • CO: 0.18 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 5.85 µg/m³
  • PM10: 7.38 µg/m³
  • O3: 0.035 ppm
  • NO2: 4.4 ppb
  • SO2: 0.4 ppb
  • CO: 0.18 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 5.77 µg/m³
  • PM10: 7.91 µg/m³
  • O3: 0.034 ppm
  • NO2: 4.2 ppb
  • SO2: 0.4 ppb
  • CO: 0.18 ppm

Health Recommendations:

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