Today | Weather | Friday, November 21, 2025

Weather in Cambridge, Massachusetts

12:07 PM
Now
Cloudy Weather
45° F
Feels Like 39°
Precipitation 35 %
Wind 10 mph
UV Index (0 - 11+) 1
Humidity 63 %
Today
Rainy Weather
Day 48°
Night 39°
Precipitation 49 %
Wind 7 mph
UV Index (0 - 11+) 1

Cambridge Weather Forecast Updated

37 minutes ago
Last updated on
Weather Forecast History
Last Year's Weather on This Day (November 21, 2024)
Rainy Weather

Day

46°

Night

43°

Wind

16 mph

Precipitation

100 %

Air Quality in Cambridge

NOW
32 AQI
Good air quality Dominant pollutant: O3

Pollutant Concentrations:

PM2.5 5.72 µg/m³
PM10 9.25 µg/m³
O3 0.035 ppm
NO2 2.6 ppb
SO2 0.6 ppb
CO 0.15 ppm
NH3 0.16 µg/m³
NO 0.5 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)
PM2.55.72 µg/m³
PM109.25 µg/m³
O368.76 µg/m³
NO24.86 µg/m³
SO21.47 µg/m³
CO171.7 µg/m³
NH30.16 µg/m³
NO0.5 µg/m³