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Key findings

  • The highest monthly average temperature in Southwest Hills for August is 70 degrees
  • The lowest monthly average temperature in Southwest Hills for December is 40 degrees
  • The most monthly precipitation in Southwest Hills occurs in November with 6.2 inches
  • The air quality index in Southwest Hills is 24% better than the national average
  • The pollution index in Southwest Hills is 36% better than the national average

Compare Portland, OR Weather

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      Southwest Hills 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"

      Southwest Hills 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.
      IndexSouthwest HillsPortlandOregon
      Air quality index383832
      Pollution index3,247,5801,899,4105,374,527

      Southwest Hills 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

      Southwest Hills air quality information

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

      Average monthly Southwest Hills temperature with heat index

      Southwest Hills monthly precipitation with daily maximum

      Southwest Hills monthly snow depth with daily maximum

      Southwest Hills monthly wind speed information

      Nearby cities with good air quality

      City, StatePopulationAir Quality IndexNational Avg.
      Damascus, OR10,8423824%
      Gladstone, OR11,8503824%
      Jennings Lodge, OR7,7273824%
      Maywood Park, OR9393824%
      North Plains, OR2,0723824%
      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 Southwest Hills, 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.