TODAY JUL13
TEMPERATURE76
HUMIDITY37
PRESSURE30.07
WIND COND.310 14.8
  • 8357Tue
  • 8561Wed
  • 8061Thu
  • 7758Fri
  • 8059Sat
daynightWeather update from Portland, Portland International Airport at

Key findings

  • The highest monthly average temperature in Portland for August is 70 degrees
  • The lowest monthly average temperature in Portland for December is 40 degrees
  • The most monthly precipitation in Portland occurs in November with 6.2 inches
  • The air quality index in Portland is 24% better than the national average
  • The pollution index in Portland is 63% better than the national average

Compare Portland, OR Weather

      vs
      How would you rate the weather in Portland?
      Write a review to give others more information about this area.
      How would you rate the air quality in Portland?
      Write a review to give others more information about this area.
      See all Portland poll results

      Portland Average Temperature

      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
      January34°F48°F40°F4.9"
      February36°F53°F43°F3.4"
      March39°F58°F48°F4.8"
      April42°F63°F52°F3.0"
      May48°F71°F58°F2.8"
      June53°F76°F63°F1.7"
      July57°F84°F69°F0.5"
      August58°F85°F70°F0.5"
      September53°F78°F64°F1.8"
      October47°F66°F55°F3.7"
      November40°F55°F47°F6.2"
      December34°F47°F40°F6.2"

      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 quality285
      Days with moderate air quality77
      Days w/ poor A.Q. for sensitive groups3
      Days with unhealthy air quality0

      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.
      Bull Mountain, OR9,6843824%
      Durham, OR1,4173824%
      Gresham, OR110,0423824%
      King City, OR3,5993824%
      Milwaukie, OR20,6433824%
      Portland, OR620,5893824%

      Cities with similar population

      City, StatePopulationAir Quality IndexNational Avg.
      Baltimore, MD621,000468%
      Oklahoma City, OK620,015484%
      Las Vegas, NV613,295548%
      Louisville, KY611,573492%
      Milwaukee, WI598,6724412%
      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.