Today | Weather | Friday, September 18, 2026

Weather in Gresham, Oregon

02:37 AM
Now
Cloudy Night
59° F
Feels Like 57°
Precipitation 0 %
Wind 6 mph
Humidity 79 %
Today
Cloudy Weather
Day 73°
Night 50°
Precipitation 1 %
Wind 5 mph
UV Index (0 - 11+) 4

Gresham Weather Forecast Updated

36 minutes ago
Last updated on
Weather Forecast History
Last Year's Weather on This Day (September 18, 2025)
Cloudy Night

Day

73°

Night

52°

Wind

5 mph

Precipitation

0 %

Air Quality in Gresham

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

Pollutant Concentrations:

PM2.5 6.68 µg/m³
PM10 13.38 µg/m³
O3 0.024 ppm
NO2 1.2 ppb
SO2 0.2 ppb
CO 0.14 ppm
NH3 0.15 µg/m³
NO 0 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)
PM2.56.68 µg/m³
PM1013.38 µg/m³
O346.93 µg/m³
NO22.17 µg/m³
SO20.44 µg/m³
CO161.71 µg/m³
NH30.15 µg/m³
NO0 µg/m³