Today | Weather | Wednesday, September 23, 2026

Weather in Boston, Massachusetts

12:08 PM
Now
Cloudy Weather
64° F
Feels Like 64°
Precipitation 0 %
Wind 16 mph
UV Index (0 - 11+) 4
Humidity 51 %
Today
Cloudy Weather
Day 64°
Night 50°
Precipitation 0 %
Wind 15 mph
UV Index (0 - 11+) 5

Boston Weather Forecast Updated

29 minutes ago
Last updated on
Weather Forecast History
Last Year's Weather on This Day (September 23, 2025)
Rainy Weather

Day

79°

Night

63°

Wind

6 mph

Precipitation

96 %

Air Quality in Boston

NOW
27 AQI
Good air quality Dominant pollutant: O3

Pollutant Concentrations:

PM2.5 1.18 µg/m³
PM10 5.06 µg/m³
O3 0.029 ppm
NO2 0.5 ppb
SO2 0.2 ppb
CO 0.16 ppm
NH3 0.06 µg/m³
NO 0.25 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)
PM2.51.18 µg/m³
PM105.06 µg/m³
O356.75 µg/m³
NO21.03 µg/m³
SO20.61 µg/m³
CO183.64 µg/m³
NH30.06 µg/m³
NO0.25 µg/m³