Today | Weather | Wednesday, September 9, 2026

Weather in Portland, Maine

09:23 PM
Now
Rainy Weather
64° F
Feels Like 59°
Precipitation 84 %
Wind 10 mph
Humidity 96 %
Today
Rainy Weather
Day 64°
Night 64°
Precipitation 98 %
Wind 10 mph

Portland Weather Forecast Updated

24 minutes ago
Last updated on

Air Quality in Portland

NOW
48 AQI
Good air quality Dominant pollutant: O3

Pollutant Concentrations:

PM2.5 10.55 µg/m³
PM10 13.59 µg/m³
O3 0.052 ppm
NO2 3 ppb
SO2 0.6 ppb
CO 0.12 ppm
NH3 0.11 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)
PM2.510.55 µg/m³
PM1013.59 µg/m³
O3102.45 µg/m³
NO25.7 µg/m³
SO21.5 µg/m³
CO141.25 µg/m³
NH30.11 µg/m³
NO0 µg/m³