Today | Weather | Wednesday, March 18, 2026

Weather in Worcester, Massachusetts

10:57 AM
Now
Cloudy Weather
28° F
Feels Like 25°
Precipitation 0 %
Wind 10 mph
UV Index (0 - 11+) 4
Humidity 35 %
Today
Cloudy Weather
Day 34°
Night 21°
Precipitation 0 %
Wind 7 mph
UV Index (0 - 11+) 5
Overnight Frost 4 AM – 8 AM
Tomorrow Morning Frost 5 AM – 7 AM

Worcester Weather Forecast Updated

Last updated on
Weather Forecast History
Last Year's Weather on This Day (March 18, 2025)
Cloudy Weather

Day

52°

Night

34°

Wind

11 mph

UV Index

5

Precipitation

0 %

Air Quality in Worcester

NOW
43 AQI
Good air quality Dominant pollutant: O3

Pollutant Concentrations:

PM2.5 0.86 µg/m³
PM10 1.8 µg/m³
O3 0.047 ppm
NO2 2.6 ppb
SO2 0.3 ppb
CO 0.16 ppm
NH3 0.34 µg/m³
NO 1.06 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)
PM2.50.86 µg/m³
PM101.8 µg/m³
O391.73 µg/m³
NO24.9 µg/m³
SO20.9 µg/m³
CO177.97 µg/m³
NH30.34 µg/m³
NO1.06 µg/m³