TODAY OCT12
TEMPERATURE66
HUMIDITY45
PRESSURE101520
WIND COND.260 5.4
  • 7549Sat
  • 7652Sun
  • 705640%
  • 6851Tue
  • 6145Wed
daynightWeather update from Portland-Hillsboro Airport at
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Weather Quick Facts

  • The highest monthly average temperature in Hillsboro for July is 67.8 degrees
  • The lowest monthly average temperature in Hillsboro for January is 38.5 degrees
  • The most monthly precipitation in Hillsboro occurs in December with 11.3 inches
  • The air quality index in Hillsboro is 10% better than the national average
  • The pollution index in Hillsboro is 456% 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 index383242
      Pollution index15,149,9007,156,3562,726,193

      Hillsboro 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
      Arsenic0.010%
      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

      CityPopulationAir Quality IndexNational Avg.
      Banks, OR1,8973824.0%
      Cornelius, OR12,7673824.0%
      Lake Oswego, OR39,4763824.0%
      West Haven-Sylvan, OR8,5053824.0%
      North Plains, OR2,7063824.0%
      Hillsboro, OR108,0263824.0%

      Cities with similar population

      CityPopulationAir Quality IndexNational Avg.
      Red Deer, AB107,873n/a 
      Sandy Springs, GA108,180524.0%
      Waterbury, CT107,8414118.0%
      Meridian, ID107,7873628.0%
      Lewisville, TX107,740512.0%
      Hillsboro, OR108,0263824.0%
      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.