Today | Weather | Wednesday, August 19, 2026

Weather in Worcester, Massachusetts

12:24 AM
Today
Cloudy Weather
Day 82°
Night 64°
Precipitation 9 %
Wind 8 mph
UV Index (0 - 11+) 8

Warning: High UV Index Today: 8

High risk of harm from unprotected sun exposure. Take precautions: wear a hat, sunglasses, and apply sunscreen regularly if you’ll be outdoors for extended periods.

Worcester Weather Forecast Updated

Weather Forecast History
Last Year's Weather on This Day (August 19, 2025)
Cloudy Night

Day

72°

Night

55°

Wind

6 mph

Precipitation

25 %

Air Quality in Worcester

NOW
26 AQI
Good air quality Dominant pollutant: O3

Pollutant Concentrations:

PM2.5 3.85 µg/m³
PM10 4.65 µg/m³
O3 0.029 ppm
NO2 3.9 ppb
SO2 0.3 ppb
CO 0.14 ppm
NH3 0.23 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)
PM2.53.85 µg/m³
PM104.65 µg/m³
O356.07 µg/m³
NO27.41 µg/m³
SO20.68 µg/m³
CO156.91 µg/m³
NH30.23 µg/m³
NO0 µg/m³