Today | Weather | Thursday, December 4, 2025

Weather in Portland, Oregon

01:29 AM
Now
Rainy Weather
48° F
Feels Like 45°
Precipitation 61 %
Wind 6 mph
Humidity 90 %
Today
Rainy Weather
Day 48°
Night 45°
Precipitation 91 %
Wind 6 mph
UV Index (0 - 11+) 0

Portland Weather Forecast Updated

Last updated on
Weather Forecast History
Last Year's Weather on This Day (December 4, 2024)
Cloudy Night

Day

46°

Night

34°

Wind

8 mph

Precipitation

6 %

Air Quality in Portland

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

Pollutant Concentrations:

PM2.5 7.88 µg/m³
PM10 9.91 µg/m³
O3 0.005 ppm
NO2 9.5 ppb
SO2 0.2 ppb
CO 0.24 ppm
NH3 0.28 µg/m³
NO 0.06 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)
PM2.57.88 µg/m³
PM109.91 µg/m³
O310 µg/m³
NO217.93 µg/m³
SO20.58 µg/m³
CO280.22 µg/m³
NH30.28 µg/m³
NO0.06 µg/m³