Today | Weather | Tuesday, September 1, 2026

Weather in Portland, Maine

06:20 AM
Now
Cloudy Night
59° F
Feels Like 57°
Precipitation 1 %
Wind 5 mph
Humidity 93 %
Today
Rainy Weather
Day 70°
Night 61°
Precipitation 55 %
Wind 7 mph
UV Index (0 - 11+) 2

Portland Weather Forecast Updated

Last updated on

Air Quality in Portland

NOW
38 AQI
Good air quality Dominant pollutant: PM2.5

Pollutant Concentrations:

PM2.5 9.14 µg/m³
PM10 12.25 µg/m³
O3 0.025 ppm
NO2 3.7 ppb
SO2 0.6 ppb
CO 0.12 ppm
NH3 0.06 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)
PM2.59.14 µg/m³
PM1012.25 µg/m³
O349.14 µg/m³
NO26.92 µg/m³
SO21.52 µg/m³
CO142 µg/m³
NH30.06 µg/m³
NO0 µg/m³