Today | Weather | Wednesday, May 27, 2026

Weather in Boston, Massachusetts

01:24 PM
Now
Cloudy Weather
82° F
Feels Like 88°
Precipitation 0 %
Wind 10 mph
UV Index (0 - 11+) 10
Humidity 42 %
Today
Cloudy Weather
Day 86°
Night 61°
Precipitation 0 %
Wind 9 mph
UV Index (0 - 11+) 10

Warning: High UV Index Today: 10

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.

Boston Weather Forecast Updated

2 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
82 AQI
Moderate air quality Dominant pollutant: PM2.5

Pollutant Concentrations:

PM2.5 27.09 µg/m³
PM10 30.21 µg/m³
O3 0.056 ppm
NO2 2.3 ppb
SO2 0.8 ppb
CO 0.19 ppm
NH3 0.06 µg/m³
NO 0.73 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)
PM2.527.09 µg/m³
PM1030.21 µg/m³
O3109.98 µg/m³
NO24.28 µg/m³
SO22.18 µg/m³
CO220.74 µg/m³
NH30.06 µg/m³
NO0.73 µg/m³