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Today | Weather | Wednesday, October 22, 2025

Weather in Cambridge, Massachusetts

02:47 PM
Now
Cloudy Weather
66° F
Feels Like 64°
Precipitation 20 %
Wind 18 mph
UV Index (0 - 11+) 11
Humidity 54 %
Today
Rainy Weather
Day 66°
Night 46°
Precipitation 88 %
Wind 13 mph
UV Index (0 - 11+) 11

Warning: Extreme UV Index Today: 11+

Overexposure to the sun's harmful UV rays can cause sunburn and increase the risk of developing skin cancer, including melanoma. Protect yourself by wearing clothing that covers your skin, sunglasses, and a hat. Apply a broad-spectrum sunscreen with an SPF of 30 or higher every two hours, even on cloudy days. Minimize direct sun exposure during peak hours (10 AM to 4 PM) to reduce the risk.

Cambridge Weather Forecast Updated

Last updated on

Weather Forecast History

Last Year's Weather on This Day (October 22, 2024)

Cloudy Night

Day

73°

Night

52°

Wind

4 mph

Precipitation

5

Air Quality in Cambridge

NOW
48 AQI
Good air quality Dominant pollutant: O3

Pollutant Concentrations:

PM2.5 4.29 µg/m³
PM10 5.69 µg/m³
O3 0.052 ppm
NO2 1.4 ppb
SO2 0.6 ppb
CO 0.11 ppm
NH3 0.35 µg/m³
NO 0.43 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 – 4.29 µg/m³
PM10 – 5.69 µg/m³
O3 – 101.39 µg/m³
NO2 – 2.55 µg/m³
SO2 – 1.62 µg/m³
CO – 130.12 µg/m³
NH3 – 0.35 µg/m³
NO – 0.43 µg/m³
View Hourly Air Quality Forecast