Today | Weather | Tuesday, November 4, 2025

Weather in Portland, Oregon

02:16 AM

Now

46° F

Feels Like 43°

Precipitation 68 %

Wind 5 mph

Humidity 100 %

Today

Day 57°

Night 48°

Precipitation 60 %

Wind 9 mph

UV Index (0 - 11+) 1

Portland Weather Forecast Updated

Last updated on November 04, 2025 12:59 AM

Weather Forecast History

Last Year's Weather on This Day (November 4, 2024)

Day

54°

Night

45°

Wind

4 mph

Precipitation

Air Quality in Portland

NOW

31 AQI

Good air quality Dominant pollutant: O₃

Pollutant Concentrations:

PM_2.5 2.11 µg/m³

PM₁₀ 3.72 µg/m³

O₃ 0.033 ppm

NO₂ 0.4 ppb

SO₂ 0.1 ppb

CO 0.09 ppm

NH₃ 0.03 µg/m³

NO 0 µg/m³

PM_2.5 – 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)

PM_2.5 – 2.11 µg/m³

PM₁₀ – 3.72 µg/m³

O₃ – 65.24 µg/m³

NO₂ – 0.8 µg/m³

SO₂ – 0.22 µg/m³

CO – 102.71 µg/m³

NH₃ – 0.03 µg/m³

NO – 0 µg/m³

View Hourly Air Quality Forecast