Today | Weather | Wednesday, May 27, 2026

Weather in Boston, Massachusetts

04:08 AM
Now
Cloudy Night
63° F
Feels Like 61°
Precipitation 0 %
Wind 8 mph
Humidity 72 %
Today
Cloudy Weather
Day 86°
Night 61°
Precipitation 0 %
Wind 10 mph
UV Index (0 - 11+) 6

Boston Weather Forecast Updated

6 minutes ago
Last updated on
Weather Forecast History
Last Year's Weather on This Day (May 27, 2025)
Cloudy Weather

Day

77°

Night

57°

Wind

7 mph

UV Index

10

Precipitation

0 %

Air Quality in Boston

NOW
85 AQI
Moderate air quality Dominant pollutant: PM2.5

Pollutant Concentrations:

PM2.5 28.3 µg/m³
PM10 31.22 µg/m³
O3 0.052 ppm
NO2 1.8 ppb
SO2 0.5 ppb
CO 0.20 ppm
NH3 0.03 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 acceptable; however, for some pollutants, there may be a moderate health concern for a very small number of people who are unusually sensitive to air pollution.

Show raw pollutant concentrations (µg/m³)
PM2.528.3 µg/m³
PM1031.22 µg/m³
O3101.55 µg/m³
NO23.45 µg/m³
SO21.36 µg/m³
CO234.02 µg/m³
NH30.03 µg/m³
NO0 µg/m³