Today | Weather | Thursday, May 21, 2026

Weather in Quincy, Massachusetts

11:19 AM
Now
Cloudy Weather
64° F
Feels Like 64°
Precipitation 34 %
Wind 9 mph
UV Index (0 - 11+) 3
Humidity 45 %
Today
Cloudy Weather
Day 64°
Night 50°
Precipitation 55 %
Wind 8 mph
UV Index (0 - 11+) 4

Quincy Weather Forecast Updated

15 minutes ago
Last updated on
Weather Forecast History
Last Year's Weather on This Day (May 21, 2025)
Rainy Weather

Day

50°

Night

48°

Wind

12 mph

UV Index

3

Precipitation

55 %

Air Quality in Quincy

NOW
27 AQI
Good air quality Dominant pollutant: O3

Pollutant Concentrations:

PM2.5 1.16 µg/m³
PM10 1.74 µg/m³
O3 0.029 ppm
NO2 3.4 ppb
SO2 0.4 ppb
CO 0.13 ppm
NH3 0.71 µg/m³
NO 0.94 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)
PM2.51.16 µg/m³
PM101.74 µg/m³
O356.67 µg/m³
NO26.34 µg/m³
SO21.17 µg/m³
CO145.47 µg/m³
NH30.71 µg/m³
NO0.94 µg/m³