Hourly Weather | Today Tuesday, January 13, 2026
Active Weather Warnings
Portland, Oregon
3 PM
Cloudy Weather
48°
Feels Like 52°
0
Humidity: 85%
Wind: 5 mph
UV Index: 1
4 PM
Cloudy Weather
48°
Feels Like 48°
0
Humidity: 91%
Wind: 4 mph
UV Index: 0
5 PM
Cloudy Night
46°
Feels Like 46°
0
Humidity: 95%
Wind: 4 mph
UV Index: 0
6 PM
Cloudy Night
45°
Feels Like 45°
0
Humidity: 96%
Wind: 4 mph
UV Index: 0
7 PM
Cloudy Night
41°
Feels Like 41°
0
Humidity: 96%
Wind: 5 mph
UV Index: 0
8 PM
Cloudy Night
39°
Feels Like 39°
0
Humidity: 100%
Wind: 5 mph
UV Index: 0
9 PM
Cloudy Night
37°
Feels Like 37°
0
Humidity: 100%
Wind: 4 mph
UV Index: 0
10 PM
Cloudy Night
37°
Feels Like 37°
0
Humidity: 99%
Wind: 4 mph
UV Index: 0
11 PM
Cloudy Night
37°
Feels Like 39°
0
Humidity: 97%
Wind: 4 mph
UV Index: 0

Hourly Air Quality Forecast - AQI (US EPA)

3 PM
42 AQI
Good air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 10.04 µg/m³
  • PM10: 12.45 µg/m³
  • O3: 0.013 ppm
  • NO2: 3.4 ppb
  • SO2: 0.1 ppb
  • CO: 0.25 ppm

Health Recommendations:

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

4 PM
41 AQI
Good air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 9.82 µg/m³
  • PM10: 12.3 µg/m³
  • O3: 0.010 ppm
  • NO2: 4.2 ppb
  • SO2: 0.1 ppb
  • CO: 0.25 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 9.82 µg/m³
  • PM10: 12.39 µg/m³
  • O3: 0.008 ppm
  • NO2: 6.2 ppb
  • SO2: 0.1 ppb
  • CO: 0.26 ppm

Health Recommendations:

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

6 PM
43 AQI
Good air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 10.26 µg/m³
  • PM10: 12.96 µg/m³
  • O3: 0.007 ppm
  • NO2: 7.7 ppb
  • SO2: 0.1 ppb
  • CO: 0.27 ppm

Health Recommendations:

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

7 PM
47 AQI
Good air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 11.19 µg/m³
  • PM10: 14.05 µg/m³
  • O3: 0.007 ppm
  • NO2: 8.5 ppb
  • SO2: 0.2 ppb
  • CO: 0.29 ppm

Health Recommendations:

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

8 PM
50 AQI
Good air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 11.92 µg/m³
  • PM10: 14.76 µg/m³
  • O3: 0.006 ppm
  • NO2: 9.1 ppb
  • SO2: 0.2 ppb
  • CO: 0.29 ppm

Health Recommendations:

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

9 PM
51 AQI
Moderate air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 12.47 µg/m³
  • PM10: 15.25 µg/m³
  • O3: 0.005 ppm
  • NO2: 9.3 ppb
  • SO2: 0.2 ppb
  • CO: 0.30 ppm

Health Recommendations:

Air quality is acceptable; some pollutants may pose a risk for a small number of unusually sensitive people.

10 PM
52 AQI
Moderate air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 12.81 µg/m³
  • PM10: 15.48 µg/m³
  • O3: 0.004 ppm
  • NO2: 9.2 ppb
  • SO2: 0.2 ppb
  • CO: 0.30 ppm

Health Recommendations:

Air quality is acceptable; some pollutants may pose a risk for a small number of unusually sensitive people.

11 PM
51 AQI
Moderate air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 12.59 µg/m³
  • PM10: 15.13 µg/m³
  • O3: 0.004 ppm
  • NO2: 9 ppb
  • SO2: 0.1 ppb
  • CO: 0.30 ppm

Health Recommendations:

Air quality is acceptable; some pollutants may pose a risk for a small number of unusually sensitive people.

Weather Alerts and Warnings for Portland

Moderate Expected Likely

Air Stagnation Advisory

Air Stagnation Advisory issued January 13 at 4:06AM PST until January 16 at 4:00AM PST by NWS Portland OR
Jan 13, 4:06 AM Jan 16, 4:00 AM
WHAT: For the Air Stagnation Advisory, light winds and limited
air movement will lead to a period of stagnant air conditions. For
the Dense Fog Advisory, visibility one quarter mile or less in
areas of dense fog.

WHERE: Central Willamette Valley, Tualatin Valley, Portland West
Hills and Chehalem Mountain, Inner Portland Metro, North Clark
County Lowlands, and Inner Vancouver Metro.

WHEN: For the Air Stagnation Advisory, until 4 AM PST Friday. For
the Dense Fog Advisory, until 11 AM PST this morning.

IMPACTS: Deteriorating air quality may cause issues for people
with respiratory problems. Low visibility could make driving
conditions hazardous.
+ Read More
State air quality agencies highly recommend that no outdoor burning occur and that residential wood burning devices be limited as much as possible. According to state air quality agencies, prolonged periods of stagnant air can hold pollutants close to the ground where people live and breathe. Check with your local burn agency for any current restrictions in your area. People with respiratory illness should follow their physician's advice for dealing with high levels of air pollution during periods of stagnant air, especially if an Air Quality Alert is in effect for your area. To see if an Air Quality Alert is in effect for your area, go to www.weather.gov/pqr and left-click your location on the homepage map display. Alternatively, you could also type your location into the search bar found on the top-left hand side of the homepage. From there, you will see an Air Quality Alert listed at the top if one is in effect for your location; you can click the alert to read more details if applicable. If driving, slow down and leave plenty of distance ahead of you. Pedestrians and cyclists should wear bright or reflective clothing to increase the chances of being seen by others in poor visibility conditions.
Updated: Jan 13, 8:32 AM Source: NWS Alert