Today | Weather | Thursday, September 24, 2026

Weather in Portland, Oregon

05:33 PM
Now
Cloudy Weather
70° F
Feels Like 68°
Precipitation 49 %
Wind 6 mph
UV Index (0 - 11+) 0
Humidity 54 %
Today
Partly Sunny with Showers
Day 72°
Night 57°
Precipitation 70 %
Wind 4 mph
UV Index (0 - 11+) 4

Portland Weather Forecast Updated

Last updated on
Weather Forecast History
Last Year's Weather on This Day (September 24, 2025)
Night

Day

81°

Night

54°

Wind

6 mph

Precipitation

0 %

Air Quality in Portland

NOW
39 AQI
Good air quality Dominant pollutant: O3

Pollutant Concentrations:

PM2.5 1.73 µg/m³
PM10 2.61 µg/m³
O3 0.042 ppm
NO2 0.7 ppb
SO2 0.1 ppb
CO 0.12 ppm
NH3 0.23 µg/m³
NO 0.02 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 – 1.73 µg/m³
PM10 – 2.61 µg/m³
O3 – 83.3 µg/m³
NO2 – 1.41 µg/m³
SO2 – 0.26 µg/m³
CO – 136.95 µg/m³
NH3 – 0.23 µg/m³
NO – 0.02 µg/m³