Today | Weather | Friday, September 18, 2026

Weather in Worcester, Massachusetts

05:38 AM
Now
Cloudy Weather
64° F
Feels Like 63°
Precipitation 20 %
Wind 8 mph
Humidity 99 %
Today
Cloudy Weather
Day 79°
Night 50°
Precipitation 0 %
Wind 9 mph
UV Index (0 - 11+) 5

Worcester Weather Forecast Updated

18 minutes ago
Last updated on
Weather Forecast History
Last Year's Weather on This Day (September 18, 2025)
Night

Day

81°

Night

59°

Wind

8 mph

Precipitation

2 %

Air Quality in Worcester

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

Pollutant Concentrations:

PM2.5 10.08 µg/m³
PM10 13 µg/m³
O3 0.022 ppm
NO2 3.5 ppb
SO2 0.5 ppb
CO 0.19 ppm
NH3 0.02 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)
PM2.510.08 µg/m³
PM1013 µg/m³
O342.85 µg/m³
NO26.61 µg/m³
SO21.35 µg/m³
CO219.47 µg/m³
NH30.02 µg/m³
NO0 µg/m³