Today | Weather | Wednesday, March 18, 2026

Weather in Portland, Oregon

09:22 AM
Now
Cloudy Weather
48° F
Feels Like 46°
Precipitation 4 %
Wind 6 mph
UV Index (0 - 11+) 1
Humidity 82 %
Today
Cloudy Weather
Day 68°
Night 50°
Precipitation 17 %
Wind 7 mph
UV Index (0 - 11+) 2

Portland Weather Forecast Updated

58 minutes ago
Last updated on
Weather Forecast History
Last Year's Weather on This Day (March 18, 2025)
Rainy Weather

Day

52°

Night

41°

Wind

6 mph

UV Index

2

Precipitation

96 %

Air Quality in Portland

NOW
13 AQI
Good air quality Dominant pollutant: O3

Pollutant Concentrations:

PM2.5 2.31 µg/m³
PM10 3.69 µg/m³
O3 0.015 ppm
NO2 2.1 ppb
SO2 0.1 ppb
CO 0.13 ppm
NH3 0.37 µg/m³
NO 0.56 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)
PM2.52.31 µg/m³
PM103.69 µg/m³
O328.47 µg/m³
NO24 µg/m³
SO20.15 µg/m³
CO143.75 µg/m³
NH30.37 µg/m³
NO0.56 µg/m³