Hourly Weather | Today Thursday, February 26, 2026
Somerville, Massachusetts
4 PM
Cloudy Weather
39°
Feels Like 37°
0
Humidity: 50%
UV Index: 1
Wind: 7 mph
5 PM
Cloudy Weather
37°
Feels Like 36°
0
Humidity: 54%
UV Index: 0
Wind: 6 mph
6 PM
Cloudy Night
36°
Feels Like 34°
0
Humidity: 58%
UV Index: 0
Wind: 6 mph
7 PM
Cloudy Night
34°
Feels Like 30°
1
Humidity: 61%
UV Index: 0
Wind: 6 mph
8 PM
Cloudy Night
30°
Feels Like 27°
1
Humidity: 62%
UV Index: 0
Wind: 6 mph
9 PM
Cloudy Night
30°
Feels Like 25°
1
Humidity: 61%
UV Index: 0
Wind: 7 mph
10 PM
Cloudy Night
28°
Feels Like 25°
1
Humidity: 60%
UV Index: 0
Wind: 7 mph
11 PM
Cloudy Night
27°
Feels Like 21°
1
Humidity: 61%
UV Index: 0
Wind: 7 mph

Hourly Air Quality Forecast - AQI (US EPA)

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

Pollutant Concentrations:

  • PM2.5: 6.79 µg/m³
  • PM10: 7.61 µg/m³
  • O3: 0.047 ppm
  • NO2: 5.3 ppb
  • SO2: 0.4 ppb
  • CO: 0.20 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 6.82 µg/m³
  • PM10: 7.67 µg/m³
  • O3: 0.047 ppm
  • NO2: 6 ppb
  • SO2: 0.4 ppb
  • CO: 0.20 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 7.2 µg/m³
  • PM10: 8.09 µg/m³
  • O3: 0.046 ppm
  • NO2: 6.4 ppb
  • SO2: 0.4 ppb
  • CO: 0.21 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 7.95 µg/m³
  • PM10: 8.95 µg/m³
  • O3: 0.045 ppm
  • NO2: 6.5 ppb
  • SO2: 0.4 ppb
  • CO: 0.21 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 9.15 µg/m³
  • PM10: 10.27 µg/m³
  • O3: 0.043 ppm
  • NO2: 6.6 ppb
  • SO2: 0.4 ppb
  • CO: 0.22 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 10.25 µg/m³
  • PM10: 11.42 µg/m³
  • O3: 0.042 ppm
  • NO2: 6.7 ppb
  • SO2: 0.5 ppb
  • CO: 0.23 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 10.31 µg/m³
  • PM10: 11.48 µg/m³
  • O3: 0.040 ppm
  • NO2: 6.7 ppb
  • SO2: 0.5 ppb
  • CO: 0.23 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 9.05 µg/m³
  • PM10: 10.13 µg/m³
  • O3: 0.039 ppm
  • NO2: 6.2 ppb
  • SO2: 0.5 ppb
  • CO: 0.22 ppm

Health Recommendations:

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