TODAY APR21
TEMPERATURE72
HUMIDITY23
PRESSURE30.06
WIND COND.100 14.8
  • 7545Wed
  • 6644Thu
  • 6747Fri60%
  • 5745Sat
  • 5843Sun
daynightWeather update from Portland, Portland-Hillsboro Airport at

Key findings

  • The highest monthly average temperature in West Slope for July is 67.8 degrees
  • The lowest monthly average temperature in West Slope for January is 38.5 degrees
  • The most monthly precipitation in West Slope occurs in December with 11.3 inches
  • The air quality index in West Slope is 24% better than the national average
  • The pollution index in West Slope is 36% better than the national average

Compare West Slope, OR Weather

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      West Slope 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
      January32°F47°F38°F4.1"
      February33°F53°F42°F3.0"
      March38°F60°F48°F4.8"
      April39°F61°F50°F2.9"
      May45°F70°F57°F4.8"
      June48°F72°F59°F2.1"
      July53°F83°F68°F1.3"
      August51°F84°F67°F1.2"
      September44°F75°F59°F2.8"
      October42°F61°F50°F3.8"
      November33°F52°F42°F7.5"
      December33°F45°F39°F11.3"

      West Slope 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.
      IndexWest SlopeOregonNational
      Air quality index383250
      Pollution index3,247,5805,374,5275,066,862

      West Slope 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

      West Slope air quality information

      PollutantTotal
      Arsenic0.002%
      Benzene0.020%
      Carbon Tetrachloride0.500%
      Lead0.040%
      Mercury0.001%

      Average monthly West Slope temperature with heat index

      West Slope monthly precipitation with daily maximum

      West Slope monthly snow depth with daily maximum

      West Slope monthly wind speed information

      Nearby cities with good air quality

      City, StatePopulationAir Quality IndexNational Avg.
      Oak Hills, OR11,6783824%
      Hazel Dell, WA20,9233824%
      Vancouver, WA169,9823824%
      Maywood Park, OR9393824%
      Cornelius, OR12,2413824%
      West Slope, OR7,6503824%

      Cities with similar population

      City, StatePopulationAir Quality IndexNational Avg.
      Gold River, CA7,652524%
      Waikele, HI7,6483040%
      Burton, SC7,6482942%
      Wetumpka, AL7,654524%
      Summit, WA7,6463040%
      West Slope, OR7,6503824%
      Source: The West Slope, 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.