Today | Weather | Monday, October 12, 2026

Weather in Portland, Maine

09:11 PM
Now
Cloudy Weather
61° F
Feels Like 57°
Precipitation 37 %
Wind 9 mph
Humidity 78 %
Today
Cloudy Weather
Day 68°
Night 46°
Precipitation 40 %
Wind 10 mph

Portland Weather Forecast Updated

Last updated on
Weather Forecast History
Last Year's Weather on This Day (October 12, 2025)
Cloudy Weather

Day

57°

Night

48°

Wind

12 mph

UV Index

20

Precipitation

14 %

Air Quality in Portland

NOW
26 AQI
Good air quality Dominant pollutant: O3

Pollutant Concentrations:

PM2.5 2.86 µg/m³
PM10 4.22 µg/m³
O3 0.028 ppm
NO2 6.7 ppb
SO2 0.3 ppb
CO 0.16 ppm
NH3 0.4 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)
PM2.5 – 2.86 µg/m³
PM10 – 4.22 µg/m³
O3 – 55.06 µg/m³
NO2 – 12.59 µg/m³
SO2 – 0.83 µg/m³
CO – 180.91 µg/m³
NH3 – 0.4 µg/m³
NO – 0 µg/m³