Hourly Weather | Today Thursday, December 4, 2025
Portland, Oregon
3 AM
Cloudy Weather
39°
Feels Like 39°
44
Humidity: 99%
Wind: 4 mph
UV Index: 0
4 AM
Cloudy Weather
39°
Feels Like 39°
49
Humidity: 97%
Wind: 5 mph
UV Index: 0
5 AM
Rainy Weather
39°
Feels Like 37°
60
Humidity: 97%
Wind: 5 mph
UV Index: 0
6 AM
Rainy Weather
39°
Feels Like 36°
60
Humidity: 98%
Wind: 5 mph
UV Index: 0
7 AM
Cloudy Weather
39°
Feels Like 39°
49
Humidity: 95%
Wind: 5 mph
UV Index: 0
8 AM
Rainy Weather
41°
Feels Like 36°
63
Humidity: 94%
Wind: 5 mph
UV Index: 0
9 AM
Rainy Weather
41°
Feels Like 37°
63
Humidity: 95%
Wind: 5 mph
UV Index: 0
10 AM
Rainy Weather
43°
Feels Like 37°
53
Humidity: 94%
Wind: 6 mph
UV Index: 0
11 AM
Cloudy Weather
43°
Feels Like 41°
49
Humidity: 93%
Wind: 6 mph
UV Index: 0
12 PM
Cloudy Weather
43°
Feels Like 43°
49
Humidity: 93%
Wind: 6 mph
UV Index: 0
1 PM
Rainy Weather
45°
Feels Like 39°
63
Humidity: 92%
Wind: 6 mph
UV Index: 0
2 PM
Rainy Weather
45°
Feels Like 39°
63
Humidity: 91%
Wind: 6 mph
UV Index: 0
3 PM
Cloudy Weather
45°
Feels Like 45°
49
Humidity: 90%
Wind: 6 mph
UV Index: 0
4 PM
Rainy Weather
46°
Feels Like 41°
56
Humidity: 90%
Wind: 6 mph
UV Index: 0
5 PM
Cloudy Weather
46°
Feels Like 45°
49
Humidity: 90%
Wind: 6 mph
UV Index: 0
6 PM
Cloudy Weather
46°
Feels Like 45°
44
Humidity: 90%
Wind: 6 mph
UV Index: 0
7 PM
Cloudy Weather
46°
Feels Like 45°
34
Humidity: 93%
Wind: 6 mph
UV Index: 0
8 PM
Cloudy Weather
46°
Feels Like 46°
34
Humidity: 90%
Wind: 5 mph
UV Index: 0
9 PM
Cloudy Weather
48°
Feels Like 48°
40
Humidity: 86%
Wind: 5 mph
UV Index: 0
10 PM
Rainy Weather
48°
Feels Like 45°
70
Humidity: 89%
Wind: 4 mph
UV Index: 0
11 PM
Rainy Weather
48°
Feels Like 45°
70
Humidity: 89%
Wind: 4 mph
UV Index: 0

Hourly Air Quality Forecast - AQI (US EPA)

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

Pollutant Concentrations:

  • PM2.5: 8.54 µg/m³
  • PM10: 10.47 µg/m³
  • O3: 0.006 ppm
  • NO2: 9 ppb
  • SO2: 0.3 ppb
  • CO: 0.24 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 8.71 µg/m³
  • PM10: 10.58 µg/m³
  • O3: 0.006 ppm
  • NO2: 8.6 ppb
  • SO2: 0.3 ppb
  • CO: 0.24 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 8.67 µg/m³
  • PM10: 10.37 µg/m³
  • O3: 0.006 ppm
  • NO2: 8.1 ppb
  • SO2: 0.3 ppb
  • CO: 0.23 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 8.21 µg/m³
  • PM10: 9.67 µg/m³
  • O3: 0.005 ppm
  • NO2: 7.5 ppb
  • SO2: 0.2 ppb
  • CO: 0.23 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 7.48 µg/m³
  • PM10: 8.77 µg/m³
  • O3: 0.005 ppm
  • NO2: 7.3 ppb
  • SO2: 0.1 ppb
  • CO: 0.23 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 6.57 µg/m³
  • PM10: 7.8 µg/m³
  • O3: 0.004 ppm
  • NO2: 7.5 ppb
  • SO2: 0.1 ppb
  • CO: 0.23 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 5.51 µg/m³
  • PM10: 6.74 µg/m³
  • O3: 0.004 ppm
  • NO2: 7.6 ppb
  • SO2: 0.1 ppb
  • CO: 0.24 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 5.11 µg/m³
  • PM10: 6.29 µg/m³
  • O3: 0.006 ppm
  • NO2: 7.1 ppb
  • SO2: 0.1 ppb
  • CO: 0.24 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 4.4 µg/m³
  • PM10: 5.29 µg/m³
  • O3: 0.014 ppm
  • NO2: 5.3 ppb
  • SO2: 0.2 ppb
  • CO: 0.21 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 3.6 µg/m³
  • PM10: 4.28 µg/m³
  • O3: 0.019 ppm
  • NO2: 4.2 ppb
  • SO2: 0.2 ppb
  • CO: 0.18 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 2.88 µg/m³
  • PM10: 3.4 µg/m³
  • O3: 0.023 ppm
  • NO2: 3.5 ppb
  • SO2: 0.2 ppb
  • CO: 0.17 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 1.84 µg/m³
  • PM10: 2.19 µg/m³
  • O3: 0.029 ppm
  • NO2: 2.3 ppb
  • SO2: 0.1 ppb
  • CO: 0.14 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 1.41 µg/m³
  • PM10: 1.71 µg/m³
  • O3: 0.031 ppm
  • NO2: 2 ppb
  • SO2: 0.1 ppb
  • CO: 0.13 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 1.25 µg/m³
  • PM10: 1.51 µg/m³
  • O3: 0.031 ppm
  • NO2: 1.9 ppb
  • SO2: 0.1 ppb
  • CO: 0.13 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 1.2 µg/m³
  • PM10: 1.44 µg/m³
  • O3: 0.030 ppm
  • NO2: 1.9 ppb
  • SO2: 0.1 ppb
  • CO: 0.13 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 1.24 µg/m³
  • PM10: 1.48 µg/m³
  • O3: 0.028 ppm
  • NO2: 2 ppb
  • SO2: 0.1 ppb
  • CO: 0.13 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 1.32 µg/m³
  • PM10: 1.58 µg/m³
  • O3: 0.026 ppm
  • NO2: 2 ppb
  • SO2: 0.1 ppb
  • CO: 0.13 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 1.43 µg/m³
  • PM10: 1.75 µg/m³
  • O3: 0.024 ppm
  • NO2: 2 ppb
  • SO2: 0.1 ppb
  • CO: 0.13 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 1.53 µg/m³
  • PM10: 1.93 µg/m³
  • O3: 0.021 ppm
  • NO2: 2 ppb
  • SO2: 0.1 ppb
  • CO: 0.13 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 1.62 µg/m³
  • PM10: 2.11 µg/m³
  • O3: 0.019 ppm
  • NO2: 2 ppb
  • SO2: 0.1 ppb
  • CO: 0.13 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: O3
Details

Pollutant Concentrations:

  • PM2.5: 1.69 µg/m³
  • PM10: 2.27 µg/m³
  • O3: 0.017 ppm
  • NO2: 1.9 ppb
  • SO2: 0.1 ppb
  • CO: 0.13 ppm

Health Recommendations:

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