Today | Weather | Thursday, February 26, 2026

Weather in Somerville, Massachusetts

02:48 PM
Now
Cloudy Weather
43° F
Feels Like 43°
Precipitation 0 %
Wind 7 mph
UV Index (0 - 11+) 2
Humidity 49 %
Today
Cloudy Weather
Day 45°
Night 16°
Precipitation 0 %
Wind 8 mph
UV Index (0 - 11+) 4
Overnight Frost 2 AM – 8 AM
Tomorrow Morning Frost 12 AM – 9 AM

Somerville Weather Forecast Updated

22 minutes ago
Last updated on

Air Quality in Somerville

NOW
45 AQI
Good air quality Dominant pollutant: O3

Pollutant Concentrations:

PM2.5 6.55 µg/m³
PM10 7.32 µg/m³
O3 0.049 ppm
NO2 4.5 ppb
SO2 0.4 ppb
CO 0.20 ppm
NH3 0.22 µg/m³
NO 1.32 µg/m³
PM2.5 – Fine particles <2.5μm
PM10 – Inhalable particles <10μm
O3 – Ozone
NO2 – Nitrogen dioxide
SO2 – Sulfur dioxide
CO – Carbon monoxide
NH3 – Ammonia
NO – Nitric oxide

Health Recommendations:

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

Show raw pollutant concentrations (µg/m³)
PM2.56.55 µg/m³
PM107.32 µg/m³
O395.5 µg/m³
NO28.39 µg/m³
SO21.11 µg/m³
CO224.41 µg/m³
NH30.22 µg/m³
NO1.32 µg/m³