TODAY OCT09
TEMPERATURE60
HUMIDITY78
PRESSURE101800
WIND COND.320 7.6
  • 6949Thu
  • 7352Fri
  • 7451Sat
  • 7451Sun
  • 7254
daynightWeather update from Portland, Portland International Airport at
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Weather Quick Facts

  • The highest monthly average temperature in Downtown for August is 69.5 degrees
  • The lowest monthly average temperature in Downtown for December is 39.9 degrees
  • The most monthly precipitation in Downtown occurs in November with 6.2 inches
  • The air quality index in Downtown is 10% better than the national average
  • The pollution index in Downtown is 30% better than the national average

Compare Portland, OR Weather

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      Downtown 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"

      Downtown 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.
      IndexDowntownPortlandOregon
      Air quality index383832
      Pollution index1,899,4101,899,4107,156,356

      Downtown air quality

      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

      Air quality details

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

      Average monthly Downtown temperature with heat index

      Downtown monthly precipitation with daily maximum

      Downtown monthly snow depth with daily maximum

      Downtown monthly wind speed information

      Nearby cities with good air quality

      CityPopulationAir Quality IndexNational Avg.
      Hockinson, WA6,1593824.0%
      Durham, OR1,7643824.0%
      Jennings Lodge, OR8,5003824.0%
      Milwaukie, OR21,0863824.0%
      Tigard, OR54,1493824.0%
      Portland, OR650,3803824.0%

      Cities with similar population

      CityPopulationAir Quality IndexNational Avg.
      Memphis, TN650,9104510.0%
      Oklahoma City, OK649,821484.0%
      Las Vegas, NV644,594548.0%
      Nashville, TN667,0704510.0%
      Detroit, MI672,3515612.0%
      Portland, OR650,3803824.0%
      Source: The Downtown, 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.