Hourly Weather | Today Friday, September 18, 2026
Gresham, Oregon
4 AM
Cloudy Night
57°
Feels Like 57°
0
Humidity: 85%
UV Index: 0
Wind: 6 mph
5 AM
Cloudy Night
57°
Feels Like 55°
0
Humidity: 83%
UV Index: 0
Wind: 6 mph
6 AM
Cloudy Night
57°
Feels Like 55°
0
Humidity: 84%
UV Index: 0
Wind: 6 mph
7 AM
Cloudy Weather
55°
Feels Like 55°
0
Humidity: 86%
UV Index: 0
Wind: 6 mph
8 AM
Cloudy Weather
57°
Feels Like 57°
0
Humidity: 85%
UV Index: 0
Wind: 5 mph
9 AM
Cloudy Weather
59°
Feels Like 59°
0
Humidity: 83%
UV Index: 1
Wind: 6 mph
10 AM
Cloudy Weather
61°
Feels Like 63°
0
Humidity: 76%
UV Index: 1
Wind: 6 mph
11 AM
Cloudy Weather
63°
Feels Like 64°
0
Humidity: 71%
UV Index: 1
Wind: 6 mph
12 PM
Cloudy Weather
66°
Feels Like 66°
0
Humidity: 64%
UV Index: 2
Wind: 6 mph
1 PM
Cloudy Weather
68°
Feels Like 70°
0
Humidity: 59%
UV Index: 2
Wind: 6 mph
2 PM
Cloudy Weather
70°
Feels Like 75°
0
Humidity: 54%
UV Index: 4
Wind: 6 mph
3 PM
Cloudy Weather
72°
Feels Like 75°
0
Humidity: 50%
UV Index: 4
Wind: 6 mph
4 PM
Cloudy Weather
72°
Feels Like 75°
0
Humidity: 47%
UV Index: 3
Wind: 5 mph
5 PM
Cloudy Weather
73°
Feels Like 75°
0
Humidity: 45%
UV Index: 2
Wind: 5 mph
6 PM
Cloudy Weather
72°
Feels Like 72°
0
Humidity: 48%
UV Index: 1
Wind: 5 mph
7 PM
Cloudy Weather
68°
Feels Like 66°
0
Humidity: 53%
UV Index: 0
Wind: 5 mph
8 PM
Night
66°
Feels Like 64°
0
Humidity: 60%
UV Index: 0
Wind: 4 mph
9 PM
Night
64°
Feels Like 63°
0
Humidity: 66%
UV Index: 0
Wind: 5 mph
10 PM
Night
61°
Feels Like 61°
0
Humidity: 74%
UV Index: 0
Wind: 5 mph
11 PM
Night
57°
Feels Like 57°
0
Humidity: 81%
UV Index: 0
Wind: 5 mph

Hourly Air Quality Forecast - AQI (US EPA)

4 AM
27 AQI
Good air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 6.45 µg/m³
  • PM10: 13.2 µg/m³
  • O3: 0.023 ppm
  • NO2: 1.1 ppb
  • SO2: 0.2 ppb
  • CO: 0.14 ppm

Health Recommendations:

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

5 AM
26 AQI
Good air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 6.24 µg/m³
  • PM10: 12.84 µg/m³
  • O3: 0.023 ppm
  • NO2: 1.1 ppb
  • SO2: 0.2 ppb
  • CO: 0.14 ppm

Health Recommendations:

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

6 AM
25 AQI
Good air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 6.01 µg/m³
  • PM10: 12.28 µg/m³
  • O3: 0.022 ppm
  • NO2: 1.1 ppb
  • SO2: 0.2 ppb
  • CO: 0.14 ppm

Health Recommendations:

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

7 AM
24 AQI
Good air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 5.71 µg/m³
  • PM10: 11.6 µg/m³
  • O3: 0.022 ppm
  • NO2: 1.3 ppb
  • SO2: 0.2 ppb
  • CO: 0.14 ppm

Health Recommendations:

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

8 AM
23 AQI
Good air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 5.44 µg/m³
  • PM10: 11.04 µg/m³
  • O3: 0.022 ppm
  • NO2: 1.6 ppb
  • SO2: 0.2 ppb
  • CO: 0.14 ppm

Health Recommendations:

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

9 AM
21 AQI
Good air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 5.15 µg/m³
  • PM10: 10.34 µg/m³
  • O3: 0.023 ppm
  • NO2: 1.8 ppb
  • SO2: 0.2 ppb
  • CO: 0.14 ppm

Health Recommendations:

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

10 AM
23 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 4.72 µg/m³
  • PM10: 9.34 µg/m³
  • O3: 0.024 ppm
  • NO2: 1.6 ppb
  • SO2: 0.2 ppb
  • CO: 0.14 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 4.13 µg/m³
  • PM10: 8.03 µg/m³
  • O3: 0.028 ppm
  • NO2: 1.2 ppb
  • SO2: 0.2 ppb
  • CO: 0.14 ppm

Health Recommendations:

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

12 PM
34 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 3.27 µg/m³
  • PM10: 6.05 µg/m³
  • O3: 0.036 ppm
  • NO2: 0.7 ppb
  • SO2: 0.2 ppb
  • CO: 0.13 ppm

Health Recommendations:

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

1 PM
37 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 2.9 µg/m³
  • PM10: 5.21 µg/m³
  • O3: 0.040 ppm
  • NO2: 0.4 ppb
  • SO2: 0.2 ppb
  • CO: 0.13 ppm

Health Recommendations:

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

2 PM
39 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 2.77 µg/m³
  • PM10: 5.01 µg/m³
  • O3: 0.042 ppm
  • NO2: 0.4 ppb
  • SO2: 0.2 ppb
  • CO: 0.13 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 2.78 µg/m³
  • PM10: 5.17 µg/m³
  • O3: 0.043 ppm
  • NO2: 0.3 ppb
  • SO2: 0.2 ppb
  • CO: 0.13 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 2.82 µg/m³
  • PM10: 5.47 µg/m³
  • O3: 0.043 ppm
  • NO2: 0.4 ppb
  • SO2: 0.2 ppb
  • CO: 0.12 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 2.86 µg/m³
  • PM10: 5.74 µg/m³
  • O3: 0.043 ppm
  • NO2: 0.5 ppb
  • SO2: 0.2 ppb
  • CO: 0.12 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 3.02 µg/m³
  • PM10: 6.21 µg/m³
  • O3: 0.040 ppm
  • NO2: 1 ppb
  • SO2: 0.2 ppb
  • CO: 0.13 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 3.28 µg/m³
  • PM10: 6.87 µg/m³
  • O3: 0.035 ppm
  • NO2: 1.8 ppb
  • SO2: 0.2 ppb
  • CO: 0.14 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 3.52 µg/m³
  • PM10: 7.59 µg/m³
  • O3: 0.031 ppm
  • NO2: 2.2 ppb
  • SO2: 0.2 ppb
  • CO: 0.15 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 3.64 µg/m³
  • PM10: 7.94 µg/m³
  • O3: 0.025 ppm
  • NO2: 2.5 ppb
  • SO2: 0.1 ppb
  • CO: 0.15 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 3.77 µg/m³
  • PM10: 8.14 µg/m³
  • O3: 0.020 ppm
  • NO2: 2.8 ppb
  • SO2: 0.1 ppb
  • CO: 0.15 ppm

Health Recommendations:

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

11 PM
16 AQI
Good air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 3.89 µg/m³
  • PM10: 8.27 µg/m³
  • O3: 0.016 ppm
  • NO2: 3.1 ppb
  • SO2: 0.1 ppb
  • CO: 0.15 ppm

Health Recommendations:

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