Hourly Weather | Today Tuesday, September 1, 2026
Somerville, Massachusetts
12 PM
Rainy Weather
70°
Feels Like 68°
70
Humidity: 83%
UV Index: 1
Wind: 9 mph
1 PM
Rainy Weather
68°
Feels Like 64°
72
Humidity: 86%
UV Index: 1
Wind: 10 mph
2 PM
Rainy Weather
68°
Feels Like 64°
75
Humidity: 87%
UV Index: 1
Wind: 10 mph
3 PM
Rainy Weather
66°
Feels Like 63°
75
Humidity: 88%
UV Index: 1
Wind: 12 mph
4 PM
Rainy Weather
66°
Feels Like 61°
75
Humidity: 87%
UV Index: 1
Wind: 13 mph
5 PM
Rainy Weather
66°
Feels Like 61°
75
Humidity: 87%
UV Index: 1
Wind: 14 mph
6 PM
Rainy Weather
64°
Feels Like 59°
75
Humidity: 87%
UV Index: 0
Wind: 13 mph
7 PM
Rainy Weather
64°
Feels Like 57°
75
Humidity: 85%
UV Index: 0
Wind: 12 mph
8 PM
Rainy Weather
63°
Feels Like 57°
52
Humidity: 92%
UV Index: 0
Wind: 9 mph
9 PM
Cloudy Weather
63°
Feels Like 61°
48
Humidity: 92%
UV Index: 0
Wind: 9 mph
10 PM
Cloudy Weather
63°
Feels Like 61°
41
Humidity: 91%
UV Index: 0
Wind: 8 mph
11 PM
Cloudy Weather
63°
Feels Like 61°
34
Humidity: 91%
UV Index: 0
Wind: 8 mph

Hourly Air Quality Forecast - AQI (US EPA)

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

Pollutant Concentrations:

  • PM2.5: 6.33 µg/m³
  • PM10: 7.24 µg/m³
  • O3: 0.046 ppm
  • NO2: 1 ppb
  • SO2: 0.2 ppb
  • CO: 0.12 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 6.62 µg/m³
  • PM10: 7.47 µg/m³
  • O3: 0.046 ppm
  • NO2: 0.9 ppb
  • SO2: 0.2 ppb
  • CO: 0.12 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 6.77 µg/m³
  • PM10: 7.55 µg/m³
  • O3: 0.045 ppm
  • NO2: 0.9 ppb
  • SO2: 0.2 ppb
  • CO: 0.12 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 6.8 µg/m³
  • PM10: 7.56 µg/m³
  • O3: 0.044 ppm
  • NO2: 1 ppb
  • SO2: 0.2 ppb
  • CO: 0.13 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 6.5 µg/m³
  • PM10: 7.25 µg/m³
  • O3: 0.043 ppm
  • NO2: 1.1 ppb
  • SO2: 0.2 ppb
  • CO: 0.13 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 5.84 µg/m³
  • PM10: 6.57 µg/m³
  • O3: 0.042 ppm
  • NO2: 1.2 ppb
  • SO2: 0.2 ppb
  • CO: 0.12 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: 4.94 µg/m³
  • PM10: 5.66 µg/m³
  • O3: 0.040 ppm
  • NO2: 1.3 ppb
  • SO2: 0.2 ppb
  • CO: 0.12 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 4.18 µg/m³
  • PM10: 5.11 µg/m³
  • O3: 0.040 ppm
  • NO2: 1.4 ppb
  • SO2: 0.2 ppb
  • CO: 0.12 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 3.46 µg/m³
  • PM10: 4.86 µg/m³
  • O3: 0.039 ppm
  • NO2: 1.3 ppb
  • SO2: 0.2 ppb
  • CO: 0.11 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 2.87 µg/m³
  • PM10: 4.72 µg/m³
  • O3: 0.040 ppm
  • NO2: 1.2 ppb
  • SO2: 0.2 ppb
  • CO: 0.11 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 2.6 µg/m³
  • PM10: 4.56 µg/m³
  • O3: 0.040 ppm
  • NO2: 1 ppb
  • SO2: 0.2 ppb
  • CO: 0.10 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 2.42 µg/m³
  • PM10: 4.19 µg/m³
  • O3: 0.040 ppm
  • NO2: 1 ppb
  • SO2: 0.2 ppb
  • CO: 0.10 ppm

Health Recommendations:

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