Today | Weather | Monday, September 14, 2026

Weather in Cambridge, Massachusetts

02:19 AM
Now
Foggy Weather
66° F
Feels Like 64°
Precipitation 15 %
Wind 7 mph
Humidity 94 %
Today
Cloudy Weather
Day 75°
Night 48°
Precipitation 25 %
Wind 13 mph
UV Index (0 - 11+) 5

Cambridge Weather Forecast Updated

27 minutes ago
Last updated on
Weather Forecast History
Last Year's Weather on This Day (September 14, 2025)
Partly Sunny with Showers

Day

75°

Night

54°

Wind

5 mph

UV Index

50

Precipitation

49 %

Air Quality in Cambridge

NOW
34 AQI
Good air quality Dominant pollutant: PM2.5

Pollutant Concentrations:

PM2.5 8.07 µg/m³
PM10 11.37 µg/m³
O3 0.022 ppm
NO2 3.6 ppb
SO2 0.4 ppb
CO 0.16 ppm
NH3 0.03 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)
PM2.58.07 µg/m³
PM1011.37 µg/m³
O344 µg/m³
NO26.74 µg/m³
SO21.09 µg/m³
CO185.88 µg/m³
NH30.03 µg/m³
NO0 µg/m³