Hourly Weather | Today Wednesday, May 20, 2026
Gresham, Oregon
3 PM
Cloudy Weather
64°
Feels Like 73°
0
Humidity: 57%
UV Index: 6
Wind: 6 mph
4 PM
Cloudy Weather
66°
Feels Like 72°
0
Humidity: 50%
UV Index: 4
Wind: 7 mph
5 PM
Cloudy Weather
68°
Feels Like 72°
0
Humidity: 47%
UV Index: 3
Wind: 7 mph
6 PM
Cloudy Weather
70°
Feels Like 72°
0
Humidity: 44%
UV Index: 2
Wind: 7 mph
7 PM
Cloudy Weather
68°
Feels Like 66°
0
Humidity: 48%
UV Index: 1
Wind: 6 mph
8 PM
Cloudy Weather
64°
Feels Like 63°
0
Humidity: 54%
UV Index: 0
Wind: 6 mph
9 PM
Cloudy Night
63°
Feels Like 61°
0
Humidity: 61%
UV Index: 0
Wind: 6 mph
10 PM
Cloudy Night
59°
Feels Like 59°
0
Humidity: 68%
UV Index: 0
Wind: 5 mph
11 PM
Cloudy Night
57°
Feels Like 57°
0
Humidity: 75%
UV Index: 0
Wind: 5 mph

Hourly Air Quality Forecast - AQI (US EPA)

3 PM
44 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 1.45 µg/m³
  • PM10: 3.14 µg/m³
  • O3: 0.047 ppm
  • NO2: 0.2 ppb
  • SO2: 0.1 ppb
  • CO: 0.11 ppm

Health Recommendations:

Air quality is considered satisfactory, and air pollution poses little or no risk.

4 PM
45 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 1.4 µg/m³
  • PM10: 3.17 µg/m³
  • O3: 0.048 ppm
  • NO2: 0.3 ppb
  • SO2: 0.1 ppb
  • CO: 0.11 ppm

Health Recommendations:

Air quality is considered satisfactory, and air pollution poses little or no risk.

5 PM
45 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 1.4 µg/m³
  • PM10: 3.26 µg/m³
  • O3: 0.049 ppm
  • NO2: 0.3 ppb
  • SO2: 0.1 ppb
  • CO: 0.11 ppm

Health Recommendations:

Air quality is considered satisfactory, and air pollution poses little or no risk.

6 PM
45 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 1.49 µg/m³
  • PM10: 3.51 µg/m³
  • O3: 0.048 ppm
  • NO2: 0.4 ppb
  • SO2: 0.1 ppb
  • CO: 0.11 ppm

Health Recommendations:

Air quality is considered satisfactory, and air pollution poses little or no risk.

7 PM
43 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 1.62 µg/m³
  • PM10: 3.85 µg/m³
  • O3: 0.046 ppm
  • NO2: 0.6 ppb
  • SO2: 0.2 ppb
  • CO: 0.11 ppm

Health Recommendations:

Air quality is considered satisfactory, and air pollution poses little or no risk.

8 PM
40 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 1.69 µg/m³
  • PM10: 4.14 µg/m³
  • O3: 0.043 ppm
  • NO2: 0.9 ppb
  • SO2: 0.2 ppb
  • CO: 0.11 ppm

Health Recommendations:

Air quality is considered satisfactory, and air pollution poses little or no risk.

9 PM
35 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 1.74 µg/m³
  • PM10: 4.29 µg/m³
  • O3: 0.038 ppm
  • NO2: 1.1 ppb
  • SO2: 0.2 ppb
  • CO: 0.11 ppm

Health Recommendations:

Air quality is considered satisfactory, and air pollution poses little or no risk.

10 PM
30 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 1.82 µg/m³
  • PM10: 4.46 µg/m³
  • O3: 0.033 ppm
  • NO2: 1.3 ppb
  • SO2: 0.2 ppb
  • CO: 0.12 ppm

Health Recommendations:

Air quality is considered satisfactory, and air pollution poses little or no risk.

11 PM
26 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 1.89 µg/m³
  • PM10: 4.65 µg/m³
  • O3: 0.028 ppm
  • NO2: 1.5 ppb
  • SO2: 0.2 ppb
  • CO: 0.12 ppm

Health Recommendations:

Air quality is considered satisfactory, and air pollution poses little or no risk.