Today | Weather | Wednesday, October 28, 2026

Weather in Gresham, Oregon

08:36 AM
Now
Rainy Weather
48° F
Feels Like 43°
Precipitation 59 %
Wind 8 mph
UV Index (0 - 11+) 0
Humidity 88 %
Today
Rainy Weather
Day 55°
Night 43°
Precipitation 85 %
Wind 8 mph
UV Index (0 - 11+) 1

Gresham Weather Forecast Updated

53 minutes ago
Last updated on
Weather Forecast History
Last Year's Weather on This Day (October 28, 2025)
Rainy Weather

Day

54°

Night

46°

Wind

7 mph

Precipitation

100 %

Air Quality in Gresham

NOW
31 AQI
Good air quality Dominant pollutant: O3

Pollutant Concentrations:

PM2.5 0.68 µg/m³
PM10 0.99 µg/m³
O3 0.033 ppm
NO2 0.9 ppb
SO2 0.1 ppb
CO 0.12 ppm
NH3 0.08 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 – 0.68 µg/m³
PM10 – 0.99 µg/m³
O3 – 64.81 µg/m³
NO2 – 1.74 µg/m³
SO2 – 0.29 µg/m³
CO – 135.4 µg/m³
NH3 – 0.08 µg/m³
NO – 0.02 µg/m³