Today | Weather | Sunday, October 4, 2026

Weather in Cambridge, Massachusetts

02:06 AM
Now
Cloudy Night
50° F
Feels Like 48°
Precipitation 0 %
Wind 5 mph
Humidity 98 %
Today
Rainy Weather
Day 64°
Night 54°
Precipitation 49 %
Wind 8 mph
UV Index (0 - 11+) 2

Cambridge Weather Forecast Updated

37 minutes ago
Last updated on
Weather Forecast History
Last Year's Weather on This Day (October 4, 2025)
Cloudy Night

Day

79°

Night

54°

Wind

5 mph

Precipitation

1 %

Air Quality in Cambridge

NOW
25 AQI
Good air quality Dominant pollutant: O3

Pollutant Concentrations:

PM2.5 2.74 µg/m³
PM10 4.49 µg/m³
O3 0.027 ppm
NO2 1.9 ppb
SO2 0.3 ppb
CO 0.14 ppm
NH3 0.06 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 – 2.74 µg/m³
PM10 – 4.49 µg/m³
O3 – 53.12 µg/m³
NO2 – 3.64 µg/m³
SO2 – 0.71 µg/m³
CO – 158.61 µg/m³
NH3 – 0.06 µg/m³
NO – 0 µg/m³