Today | Weather | Tuesday, November 3, 2026

Weather in Somerville, Massachusetts

02:37 AM
Now
Cloudy Night
52° F
Feels Like 48°
Precipitation 0 %
Wind 6 mph
Humidity 75 %
Today
Cloudy Weather
Day 72°
Night 52°
Precipitation 4 %
Wind 7 mph
UV Index (0 - 11+) 3

Somerville Weather Forecast Updated

45 minutes ago
Last updated on
Weather Forecast History
Last Year's Weather on This Day (November 3, 2025)
Rainy Night

Day

57°

Night

43°

Wind

18 mph

Precipitation

96 %

Air Quality in Somerville

NOW
31 AQI
Good air quality Dominant pollutant: O3

Pollutant Concentrations:

PM2.5 6.91 µg/m³
PM10 11.86 µg/m³
O3 0.033 ppm
NO2 6.3 ppb
SO2 0.7 ppb
CO 0.19 ppm
NH3 0.2 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)
PM2.5 – 6.91 µg/m³
PM10 – 11.86 µg/m³
O3 – 64.92 µg/m³
NO2 – 11.8 µg/m³
SO2 – 1.94 µg/m³
CO – 213.83 µg/m³
NH3 – 0.2 µg/m³
NO – 0 µg/m³