Today | Weather | Tuesday, July 21, 2026

Weather in Worcester, Massachusetts

04:16 AM
Now
Cloudy Night
61° F
Feels Like 57°
Precipitation 0 %
Wind 7 mph
Humidity 88 %
Today
Stormy Weather
Day 75°
Night 66°
Precipitation 88 %
Wind 10 mph
UV Index (0 - 11+) 4

Worcester Weather Forecast Updated

Last updated on
Weather Forecast History
Last Year's Weather on This Day (July 21, 2025)
Night

Day

77°

Night

54°

Wind

7 mph

Precipitation

1 %

Air Quality in Worcester

NOW
47 AQI
Good air quality Dominant pollutant: O3

Pollutant Concentrations:

PM2.5 8.85 µg/m³
PM10 12.1 µg/m³
O3 0.050 ppm
NO2 0.7 ppb
SO2 0.3 ppb
CO 0.14 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)
PM2.58.85 µg/m³
PM1012.1 µg/m³
O398.89 µg/m³
NO21.32 µg/m³
SO20.72 µg/m³
CO164.92 µg/m³
NH30.03 µg/m³
NO0 µg/m³