Today | Weather | Thursday, December 4, 2025

Weather in Worcester, Massachusetts

04:29 AM
Now
Cloudy Night
28° F
Feels Like 19°
Precipitation 0 %
Wind 9 mph
Humidity 74 %
Today
Snowy Weather
Day 36°
Night
Precipitation 91 %
Wind 16 mph
UV Index (0 - 11+) 1

Worcester Weather Forecast Updated

13 minutes ago
Last updated on
Weather Forecast History
Last Year's Weather on This Day (December 4, 2024)
Snowy Weather

Day

36°

Night

32°

Wind

12 mph

Precipitation

96 %

Air Quality in Worcester

NOW
66 AQI
Moderate air quality Dominant pollutant: PM2.5

Pollutant Concentrations:

PM2.5 19.36 µg/m³
PM10 26.71 µg/m³
O3 0.010 ppm
NO2 27.3 ppb
SO2 3.3 ppb
CO 0.32 ppm
NH3 1.2 µg/m³
NO 0.01 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 acceptable; however, for some pollutants, there may be a moderate health concern for a very small number of people who are unusually sensitive to air pollution.

Show raw pollutant concentrations (µg/m³)
PM2.519.36 µg/m³
PM1026.71 µg/m³
O319.45 µg/m³
NO251.28 µg/m³
SO28.58 µg/m³
CO361.88 µg/m³
NH31.2 µg/m³
NO0.01 µg/m³