Today | Weather | Thursday, June 11, 2026

Weather in Portland, Maine

11:24 AM
Now
Stormy Weather
72° F
Feels Like 75°
Precipitation 51 %
Wind 7 mph
UV Index (0 - 11+) 1
Humidity 92 %
Today
Stormy Weather
Day 75°
Night 63°
Precipitation 55 %
Wind 6 mph
UV Index (0 - 11+) 3

Portland Weather Forecast Updated

42 minutes ago
Last updated on

Air Quality in Portland

NOW
39 AQI
Good air quality Dominant pollutant: O3

Pollutant Concentrations:

PM2.5 8.01 µg/m³
PM10 8.55 µg/m³
O3 0.043 ppm
NO2 1.7 ppb
SO2 0.5 ppb
CO 0.14 ppm
NH3 0.25 µg/m³
NO 0.63 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)
PM2.58.01 µg/m³
PM108.55 µg/m³
O383.61 µg/m³
NO23.21 µg/m³
SO21.23 µg/m³
CO155.79 µg/m³
NH30.25 µg/m³
NO0.63 µg/m³