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Key findings

  • The highest monthly average temperature in Hillsboro for July is 68 degrees
  • The lowest monthly average temperature in Hillsboro for January is 38 degrees
  • The most monthly precipitation in Hillsboro occurs in December with 11.3 inches
  • The air quality index in Hillsboro is 24% better than the national average
  • The pollution index in Hillsboro is 199% worse than the national average

Compare Hillsboro, OR Weather

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      Hillsboro 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"

      Hillsboro 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.
      IndexHillsboroOregonNational
      Air quality index383250
      Pollution index15,149,9005,374,5275,066,862

      Hillsboro 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

      Hillsboro air quality information

      PollutantTotal
      Arsenic0.010%
      Benzene0.160%
      Carbon Tetrachloride0.030%
      Lead0.080%
      Mercury0.010%

      Average monthly Hillsboro temperature with heat index

      Hillsboro monthly precipitation with daily maximum

      Hillsboro monthly snow depth with daily maximum

      Hillsboro monthly wind speed information

      Nearby cities with good air quality

      City, StatePopulationAir Quality IndexNational Avg.
      Metzger, OR3,9673824%
      West Slope, OR7,6503824%
      Rivergrove, OR4383824%
      Yamhill, OR1,1743824%
      Cedar Mill, OR15,9933824%
      Hillsboro, OR100,4623824%

      Cities with similar population

      City, StatePopulationAir Quality IndexNational Avg.
      Jurupa Valley, CA100,7378978%
      Erie, PA100,1573628%
      South Bend, IN101,0374216%
      Kenosha, WI99,8653922%
      Las Cruces, NM101,459512%
      Hillsboro, OR100,4623824%
      Source: The Hillsboro, 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.