TODAY APR25
TEMPERATURE54°F
HUMIDITY71%
PRESSURE30.02 inHg
WIND COND.0° 0 mph
  • 8455Today
  • 8254Thu20%
  • 6050Fri60% | 50%
  • 5749Sat50%
  • 5646Sun
daynightWeather update from Portland, Portland International Airport, on 25 Apr 4:05 am PDT

Portland Average Weather

In the event that the weather data was unavailable for this city, estimates based upon nearby cities were used.
MonthTemp. (min)Temp. (max)Temp. (avg)Precipitation
January19°F66°F41°F5.1"
February22°F65°F43°F2.0"
March28°F75°F47°F3.5"
April31°F83°F51°F2.6"
May37°F95°F59°F2.9"
June46°F102°F63°F1.4"
July51°F106°F70°F0.4"
August48°F102°F68°F0.6"
September41°F95°F64°F1.1"
October30°F78°F54°F2.6"
November27°F67°F47°F6.1"
December12°F63°F39°F5.2"

Did you know?

  • The highest monthly average temperature in Portland for July is 70 degrees.
  • The lowest monthly average temperature in Portland for December is 39 degrees.
  • The most monthly precipitation in Portland occurs in November with 6.1 inches.
  • The air quality index in Portland is 23% better than the national average.
  • The pollution index in Portland is 62% better than the national average.

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Compare Portland, OR Weather To Other Cities

Portland air quality index & pollution index

In the event that the air quality/pollution data was unavailable for this city, estimates based upon nearby cities were used.
IndexPortlandOregonNational
Air quality index383250
Pollution index1,899,4105,374,5275,066,862

Portland air quality information

MeasurementTotal
Days measured365
Days with good air quality241
Days with moderate air quality108
Days w/ poor A.Q. for sensitive groups12
Days with unhealthy air quality4

Portland air quality information

PollutantTotal
Arsenic0.003%
Benzene0.020%
Carbon Tetrachloride0.010%
Lead0.010%
Mercury0.002%

Average monthly Portland temperature with heat index

Portland monthly precipitation with daily maximum

Portland monthly snow depth with daily maximum

Portland monthly wind speed information

Nearby cities with good air quality

City, StatePopulationAir Quality IndexNational Avg.
Beaverton, OR94,8653824%
Cedar Mill, OR15,9933824%
Garden Home-Whitford, OR6,2913824%
Jennings Lodge, OR7,7273824%
Maywood Park, OR9393824%
Portland, OR620,5893824%

Cities with similar population

City, StatePopulationAir Quality IndexNational Avg.
Baltimore, MD621,000468%
Oklahoma City, OK620,015476%
Las Vegas, NV613,295548%
Louisville, KY611,5735510%
Milwaukee, WI598,6724510%
Portland, OR620,5893824%
Source: The Portland, OR weather data displayed above is derived from the NOAA (National Oceanic and Atmospheric). Air quality and pollution data is derived from the EPA (United States Environmental Protection Agency). Air quality and pollution levels measured in a particular area may not be representative of the entire county.