Today | Weather | Tuesday, April 28, 2026

Weather in Somerville, Massachusetts

04:11 AM
Now
Night
39° F
Feels Like 37°
Precipitation 0 %
Wind 6 mph
Humidity 96 %
Today
Cloudy Weather
Day 59°
Night 41°
Precipitation 1 %
Wind 10 mph
UV Index (0 - 11+) 8

Warning: High UV Index Today: 8

High risk of harm from unprotected sun exposure. Take precautions: wear a hat, sunglasses, and apply sunscreen regularly if you’ll be outdoors for extended periods.

Somerville Weather Forecast Updated

Last updated on

Air Quality in Somerville

NOW
21 AQI
Good air quality Dominant pollutant: O3

Pollutant Concentrations:

PM2.5 3.71 µg/m³
PM10 5.26 µg/m³
O3 0.023 ppm
NO2 6.3 ppb
SO2 0.2 ppb
CO 0.19 ppm
NH3 0.16 µg/m³
NO 0 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)
PM2.53.71 µg/m³
PM105.26 µg/m³
O345.35 µg/m³
NO211.79 µg/m³
SO20.52 µg/m³
CO215.31 µg/m³
NH30.16 µg/m³
NO0 µg/m³